From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 testing/web-platform/tests/tools/ci/tc/README.md   | 243 +++++++++
 testing/web-platform/tests/tools/ci/tc/__init__.py |   0
 testing/web-platform/tests/tools/ci/tc/decision.py | 414 +++++++++++++++
 testing/web-platform/tests/tools/ci/tc/download.py | 111 ++++
 .../tests/tools/ci/tc/github_checks_output.py      |  34 ++
 .../web-platform/tests/tools/ci/tc/sink_task.py    |  65 +++
 .../web-platform/tests/tools/ci/tc/taskgraph.py    | 175 ++++++
 .../web-platform/tests/tools/ci/tc/tasks/test.yml  | 589 +++++++++++++++++++++
 .../ci/tc/testdata/epochs_daily_push_event.json    | 460 ++++++++++++++++
 .../tools/ci/tc/testdata/master_push_event.json    | 214 ++++++++
 .../tests/tools/ci/tc/testdata/pr_event.json       | 577 ++++++++++++++++++++
 .../ci/tc/testdata/pr_event_tests_affected.json    | 505 ++++++++++++++++++
 .../tests/tools/ci/tc/tests/__init__.py            |   0
 .../tests/tools/ci/tc/tests/test_decision.py       |  56 ++
 .../tests/tools/ci/tc/tests/test_taskgraph.py      | 148 ++++++
 .../tests/tools/ci/tc/tests/test_valid.py          | 379 +++++++++++++
 16 files changed, 3970 insertions(+)
 create mode 100644 testing/web-platform/tests/tools/ci/tc/README.md
 create mode 100644 testing/web-platform/tests/tools/ci/tc/__init__.py
 create mode 100644 testing/web-platform/tests/tools/ci/tc/decision.py
 create mode 100644 testing/web-platform/tests/tools/ci/tc/download.py
 create mode 100644 testing/web-platform/tests/tools/ci/tc/github_checks_output.py
 create mode 100644 testing/web-platform/tests/tools/ci/tc/sink_task.py
 create mode 100644 testing/web-platform/tests/tools/ci/tc/taskgraph.py
 create mode 100644 testing/web-platform/tests/tools/ci/tc/tasks/test.yml
 create mode 100644 testing/web-platform/tests/tools/ci/tc/testdata/epochs_daily_push_event.json
 create mode 100644 testing/web-platform/tests/tools/ci/tc/testdata/master_push_event.json
 create mode 100644 testing/web-platform/tests/tools/ci/tc/testdata/pr_event.json
 create mode 100644 testing/web-platform/tests/tools/ci/tc/testdata/pr_event_tests_affected.json
 create mode 100644 testing/web-platform/tests/tools/ci/tc/tests/__init__.py
 create mode 100644 testing/web-platform/tests/tools/ci/tc/tests/test_decision.py
 create mode 100644 testing/web-platform/tests/tools/ci/tc/tests/test_taskgraph.py
 create mode 100644 testing/web-platform/tests/tools/ci/tc/tests/test_valid.py

(limited to 'testing/web-platform/tests/tools/ci/tc')

diff --git a/testing/web-platform/tests/tools/ci/tc/README.md b/testing/web-platform/tests/tools/ci/tc/README.md
new file mode 100644
index 0000000000..785c82cca3
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/README.md
@@ -0,0 +1,243 @@
+# Taskgraph Setup
+
+The taskgraph is built from a YAML file. This file has two top-level
+properties: `components` and `tasks`. The full list of tasks is
+defined by the `tasks` object; each task is an object with a single
+property representing the task with the corresponding value an object
+representing the task properties. Each task requires the following
+top-level properties:
+
+* `provisionerId`: String. Name of Taskcluster provisioner
+* `schedulerId`: String. Name of Taskcluster scheduler
+* `deadline`: String. Time until the task expires
+* `image`: String. Name of docker image to use for task
+* `maxRunTime`: Number. Maximum time in seconds for which the task can
+  run.
+* `artifacts`: Object. List of artifacts and directories to upload; see
+  Taskcluster documentation.
+* `command`: String. Command to run. This is automatically wrapped in a
+  run_tc command
+* `options`: Optional Object. Options to pass into run_tc
+  - xvfb: Boolean. Enable Xvfb for run
+  - oom-killer: Boolean. Enable xvfb for run
+  - hosts: Boolean. Update hosts file with wpt hosts before run
+  - install-certificates: Boolean. Install wpt certs into OS
+    certificate store for run
+  - browser: List. List of browser names for run
+  - channel: String. Browser channel for run
+* `trigger`: Object. Conditions on which to consider task. One or more
+  of following properties:
+  - branch: List. List of branch names on which to trigger.
+  - pull-request: No value. Trigger for pull request actions
+* `schedule-if`: Optional Object. Conditions on which task should be
+  scheduled given it meets the trigger conditions.
+  - `run-job`: List. Job names for which this task should be considered,
+    matching the output from `./wpt test-jobs`
+* `env`: Optional Object. Environment variables to set when running task.
+* `depends-on`: Optional list. List of task names that must be complete
+  before the current task is scheduled.
+* `description`: String. Task description.
+* `name`: Optional String. Name to use for the task overriding the
+  property name. This is useful in combination with substitutions
+  described below.
+* `download-artifacts`: Optional Object. An artifact to download from
+  a task that this task depends on. This has the following properties:
+  - `task` - Name of the task producing the artifact
+  - `glob` - A glob pattern for the filename of the artifact
+  - `dest` - A directory reltive to the home directory in which to place
+             the artifact
+  - `extract` - Optional. A boolean indicating whether an archive artifact
+                should be extracted in-place.
+
+## Task Expansions
+
+Using the above syntax it's possble to describe each task
+directly. But typically in a taskgraph there are many common
+properties between tasks so it's tedious and error prone to repeat
+information that's common to multiple tasks. Therefore the taskgraph
+format provides several mechanisms to reuse partial task definitions
+across multiple tasks.
+
+### Components
+
+The other top-level property in the taskgraph format is
+`components`. The value of this property is an object containing named
+partial task definitions. Each task definition may contain a property called
+`use` which is a list of components to use as the basis for the task
+definition. The components list is evaluated in order. If a property
+is not previously defined in the output it is added to the output. If
+it was previously defined, the value is updated according to the type:
+ * Strings and numbers are replaced with a new value
+ * Lists are extended with the additional values
+ * Objects are updated recursively following the above rules
+This means that types must always match between components and the
+final value.
+
+For example
+```
+components:
+  example-1:
+    list_prop:
+      - first
+      - second
+    object_prop:
+      key1: value1
+      key2: base_value
+  example-2:
+    list_prop:
+      - third
+      - fourth
+    object_prop:
+      key3:
+        - value3-1
+
+tasks:
+  - example-task:
+      use:
+        - example-1
+        - example-2
+      object_prop:
+        key2: value2
+        key3:
+          - value3-2
+```
+
+will evaluate to the following task:
+
+```
+example-task:
+  list_prop:
+    - first
+    - second
+    - third
+    - fourth
+  object_prop:
+    key1: value1
+    key2: value2
+    key3:
+      - value3-1
+      - value3-2
+```
+
+Note that components cannot currently define `use` properties of their own.
+
+## Substitutions
+
+Components and tasks can define a property `vars` that holds variables
+which are later substituted into the task definition using the syntax
+`${vars.property-name}`. For example:
+
+```
+components:
+  generic-component:
+    prop: ${vars.value}
+
+tasks:
+  - first:
+      use:
+        - generic-component
+      vars:
+        value: value1
+  - second:
+      use:
+        - generic-component
+      vars:
+        value: value2
+```
+
+Results in the following tasks:
+
+```
+first:
+  prop: value1
+second:
+  prop: value2
+```
+
+## Maps
+
+Instead of defining a task directly, an item in the tasks property may
+be an object with a single property `$map`. This object itself has two
+child properties; `for` and `do`. The value of `for` is a list of
+objects, and the value of `do` is either an object or a list of
+objects. For each object in the `for` property, a set of tasks is
+created by taking a copy of that object for each task in the `do`
+property, updating the object with the properties from the
+corresponding `do` object, using the same rules as for components
+above, and then processing as for a normal task. `$map` rules can also
+be nested.
+
+Note: Although `$map` shares a name with the `$map` used in json-e
+(used. in `.taskcluster.yml`), the semantics are different.
+
+For example
+
+```
+components: {}
+tasks:
+  $map:
+    for:
+      - vars:
+          example: value1
+      - vars:
+          example: value2
+    do:
+      example-${vars.example}
+        prop: ${vars.example}
+```
+
+Results in the tasks
+
+```
+example-value1:
+  prop: value1
+example-value2:
+  prop: value2
+```
+
+Note that in combination with `$map`, variable substitutions are
+applied *twice*; once after the `$map` is evaluated and once after the
+`use` statements are evaluated.
+
+## Chunks
+
+A common requirements for tasks is that they are "chunked" into N
+partial tasks. This is handled specially in the syntax. A top level
+property `chunks` can be used to define the number of individual
+chunks to create for a specific task. Each chunked task is created
+with a `chunks` property set to an object containing an `id` property
+containing the one-based index of the chunk an a `total` property
+containing the total number of chunks. These can be substituted into
+the task definition using the same syntax as for `vars` above
+e.g. `${chunks.id}`. Note that because task names must be unique, it's
+common to specify a `name` property on the task that will override the
+property name e.g.
+
+```
+components: {}
+tasks:
+  - chunked-task:
+      chunks:2
+      command: "task-run --chunk=${chunks.id} --totalChunks=${chunks.total}"
+      name: task-chunk-${chunks.id}
+```
+
+creates tasks:
+
+```
+task-chunk-1:
+  command: "task-run --chunk=1 --totalChunks=2"
+task-chunk-2:
+  command: "task-run --chunk=2 --totalChunks=2"
+```
+
+# Overall processing model
+
+The overall processing model for tasks is as follows:
+ * Evaluate maps
+ * Perform subsitutions
+ * Evaluate use statements
+ * Expand chunks
+ * Perform subsitutions
+
+At each point after maps are evaluated tasks must have a unique name.
diff --git a/testing/web-platform/tests/tools/ci/tc/__init__.py b/testing/web-platform/tests/tools/ci/tc/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/testing/web-platform/tests/tools/ci/tc/decision.py b/testing/web-platform/tests/tools/ci/tc/decision.py
new file mode 100644
index 0000000000..d00ba6ba19
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/decision.py
@@ -0,0 +1,414 @@
+# mypy: allow-untyped-defs
+
+import argparse
+import json
+import logging
+import os
+import re
+import subprocess
+from collections import OrderedDict
+
+import taskcluster
+
+from . import taskgraph
+
+
+here = os.path.abspath(os.path.dirname(__file__))
+
+
+logging.basicConfig()
+logger = logging.getLogger()
+
+
+def get_triggers(event):
+    # Set some variables that we use to get the commits on the current branch
+    ref_prefix = "refs/heads/"
+    is_pr = "pull_request" in event
+    branch = None
+    if not is_pr and "ref" in event:
+        branch = event["ref"]
+        if branch.startswith(ref_prefix):
+            branch = branch[len(ref_prefix):]
+
+    return is_pr, branch
+
+
+def fetch_event_data(queue):
+    try:
+        task_id = os.environ["TASK_ID"]
+    except KeyError:
+        logger.warning("Missing TASK_ID environment variable")
+        # For example under local testing
+        return None
+
+    task_data = queue.task(task_id)
+
+    return task_data.get("extra", {}).get("github_event")
+
+
+def filter_triggers(event, all_tasks):
+    is_pr, branch = get_triggers(event)
+    triggered = OrderedDict()
+    for name, task in all_tasks.items():
+        if "trigger" in task:
+            if is_pr and "pull-request" in task["trigger"]:
+                triggered[name] = task
+            elif branch is not None and "branch" in task["trigger"]:
+                for trigger_branch in task["trigger"]["branch"]:
+                    if (trigger_branch == branch or
+                        trigger_branch.endswith("*") and branch.startswith(trigger_branch[:-1])):
+                        triggered[name] = task
+    logger.info("Triggers match tasks:\n * %s" % "\n * ".join(triggered.keys()))
+    return triggered
+
+
+def get_run_jobs(event):
+    from tools.ci import jobs
+    revish = "%s..%s" % (event["pull_request"]["base"]["sha"]
+                         if "pull_request" in event
+                         else event["before"],
+                         event["pull_request"]["head"]["sha"]
+                         if "pull_request" in event
+                         else event["after"])
+    logger.info("Looking for changes in range %s" % revish)
+    paths = jobs.get_paths(revish=revish)
+    logger.info("Found changes in paths:%s" % "\n".join(paths))
+    path_jobs = jobs.get_jobs(paths)
+    all_jobs = path_jobs | get_extra_jobs(event)
+    logger.info("Including jobs:\n * %s" % "\n * ".join(all_jobs))
+    return all_jobs
+
+
+def get_extra_jobs(event):
+    body = None
+    jobs = set()
+    if "commits" in event and event["commits"]:
+        body = event["commits"][0]["message"]
+    elif "pull_request" in event:
+        body = event["pull_request"]["body"]
+
+    if not body:
+        return jobs
+
+    regexp = re.compile(r"\s*tc-jobs:(.*)$")
+
+    for line in body.splitlines():
+        m = regexp.match(line)
+        if m:
+            items = m.group(1)
+            for item in items.split(","):
+                jobs.add(item.strip())
+            break
+    return jobs
+
+
+def filter_excluded_users(tasks, event):
+    # Some users' pull requests are excluded from tasks,
+    # such as pull requests from automated exports.
+    try:
+        submitter = event["pull_request"]["user"]["login"]
+    except KeyError:
+        # Just ignore excluded users if the
+        # username cannot be pulled from the event.
+        logger.debug("Unable to read username from event. Continuing.")
+        return
+
+    excluded_tasks = []
+    # A separate list of items for tasks is needed to iterate over
+    # because removing an item during iteration will raise an error.
+    for name, task in list(tasks.items()):
+        if submitter in task.get("exclude-users", []):
+            excluded_tasks.append(name)
+            tasks.pop(name)  # removing excluded task
+    if excluded_tasks:
+        logger.info(
+            f"Tasks excluded for user {submitter}:\n * " +
+            "\n * ".join(excluded_tasks)
+        )
+
+
+def filter_schedule_if(event, tasks):
+    scheduled = OrderedDict()
+    run_jobs = None
+    for name, task in tasks.items():
+        if "schedule-if" in task:
+            if "run-job" in task["schedule-if"]:
+                if run_jobs is None:
+                    run_jobs = get_run_jobs(event)
+                if "all" in run_jobs or any(item in run_jobs for item in task["schedule-if"]["run-job"]):
+                    scheduled[name] = task
+        else:
+            scheduled[name] = task
+    logger.info("Scheduling rules match tasks:\n * %s" % "\n * ".join(scheduled.keys()))
+    return scheduled
+
+
+def get_fetch_rev(event):
+    is_pr, _ = get_triggers(event)
+    if is_pr:
+        # Try to get the actual rev so that all non-decision tasks are pinned to that
+        rv = ["refs/pull/%s/merge" % event["pull_request"]["number"]]
+        # For every PR GitHub maintains a 'head' branch with commits from the
+        # PR, and a 'merge' branch containing a merge commit between the base
+        # branch and the PR.
+        for ref_type in ["head", "merge"]:
+            ref = "refs/pull/%s/%s" % (event["pull_request"]["number"], ref_type)
+            sha = None
+            try:
+                output = subprocess.check_output(["git", "ls-remote", "origin", ref])
+            except subprocess.CalledProcessError:
+                import traceback
+                logger.error(traceback.format_exc())
+                logger.error("Failed to get commit sha1 for %s" % ref)
+            else:
+                if not output:
+                    logger.error("Failed to get commit for %s" % ref)
+                else:
+                    sha = output.decode("utf-8").split()[0]
+            rv.append(sha)
+        rv = tuple(rv)
+    else:
+        # For a branch push we have a ref and a head but no merge SHA
+        rv = (event["ref"], event["after"], None)
+    assert len(rv) == 3
+    return rv
+
+
+def build_full_command(event, task):
+    fetch_ref, head_sha, merge_sha = get_fetch_rev(event)
+    cmd_args = {
+        "task_name": task["name"],
+        "repo_url": event["repository"]["clone_url"],
+        "fetch_ref": fetch_ref,
+        "task_cmd": task["command"],
+        "install_str": "",
+    }
+
+    options = task.get("options", {})
+    options_args = []
+    options_args.append("--ref=%s" % fetch_ref)
+    if head_sha is not None:
+        options_args.append("--head-rev=%s" % head_sha)
+    if merge_sha is not None:
+        options_args.append("--merge-rev=%s" % merge_sha)
+    if options.get("oom-killer"):
+        options_args.append("--oom-killer")
+    if options.get("xvfb"):
+        options_args.append("--xvfb")
+    if not options.get("hosts"):
+        options_args.append("--no-hosts")
+    else:
+        options_args.append("--hosts")
+    # Check out the expected SHA unless it is overridden (e.g. to base_head).
+    if options.get("checkout"):
+        options_args.append("--checkout=%s" % options["checkout"])
+    for browser in options.get("browser", []):
+        options_args.append("--browser=%s" % browser)
+    if options.get("channel"):
+        options_args.append("--channel=%s" % options["channel"])
+    if options.get("install-certificates"):
+        options_args.append("--install-certificates")
+
+    cmd_args["options_str"] = " ".join(str(item) for item in options_args)
+
+    install_packages = task.get("install")
+    if install_packages:
+        install_items = ["apt update -qqy"]
+        install_items.extend("apt install -qqy %s" % item
+                             for item in install_packages)
+        cmd_args["install_str"] = "\n".join("sudo %s;" % item for item in install_items)
+
+    return ["/bin/bash",
+            "--login",
+            "-xc",
+            """
+~/start.sh \
+  %(repo_url)s \
+  %(fetch_ref)s;
+%(install_str)s
+cd web-platform-tests;
+./tools/ci/run_tc.py %(options_str)s -- %(task_cmd)s;
+""" % cmd_args]
+
+
+def get_owner(event):
+    if "pusher" in event:
+        pusher = event.get("pusher", {}).get("email", "")
+        if pusher and "@" in pusher:
+            return pusher
+    return "web-platform-tests@users.noreply.github.com"
+
+
+def create_tc_task(event, task, taskgroup_id, depends_on_ids, env_extra=None):
+    command = build_full_command(event, task)
+    task_id = taskcluster.slugId()
+    task_data = {
+        "taskGroupId": taskgroup_id,
+        "created": taskcluster.fromNowJSON(""),
+        "deadline": taskcluster.fromNowJSON(task["deadline"]),
+        "provisionerId": task["provisionerId"],
+        "schedulerId": task["schedulerId"],
+        "workerType": task["workerType"],
+        "scopes": task.get("scopes", []),
+        "metadata": {
+            "name": task["name"],
+            "description": task.get("description", ""),
+            "owner": get_owner(event),
+            "source": event["repository"]["clone_url"]
+        },
+        "payload": {
+            "artifacts": task.get("artifacts"),
+            "command": command,
+            "image": task.get("image"),
+            "maxRunTime": task.get("maxRunTime"),
+            "env": task.get("env", {}),
+        },
+        "extra": {
+            "github_event": json.dumps(event)
+        },
+        "routes": ["checks"]
+    }
+    if "extra" in task:
+        task_data["extra"].update(task["extra"])
+    if task.get("privileged"):
+        if "capabilities" not in task_data["payload"]:
+            task_data["payload"]["capabilities"] = {}
+        task_data["payload"]["capabilities"]["privileged"] = True
+    if env_extra:
+        task_data["payload"]["env"].update(env_extra)
+    if depends_on_ids:
+        task_data["dependencies"] = depends_on_ids
+        task_data["requires"] = task.get("requires", "all-completed")
+    return task_id, task_data
+
+
+def get_artifact_data(artifact, task_id_map):
+    task_id, data = task_id_map[artifact["task"]]
+    return {
+        "task": task_id,
+        "glob": artifact["glob"],
+        "dest": artifact["dest"],
+        "extract": artifact.get("extract", False)
+    }
+
+
+def build_task_graph(event, all_tasks, tasks):
+    task_id_map = OrderedDict()
+    taskgroup_id = os.environ.get("TASK_ID", taskcluster.slugId())
+    sink_task_depends_on = []
+
+    def add_task(task_name, task):
+        depends_on_ids = []
+        if "depends-on" in task:
+            for depends_name in task["depends-on"]:
+                if depends_name not in task_id_map:
+                    add_task(depends_name,
+                             all_tasks[depends_name])
+                depends_on_ids.append(task_id_map[depends_name][0])
+        env_extra = {}
+        if "download-artifacts" in task:
+            env_extra["TASK_ARTIFACTS"] = json.dumps(
+                [get_artifact_data(artifact, task_id_map)
+                 for artifact in task["download-artifacts"]])
+
+        task_id, task_data = create_tc_task(event, task, taskgroup_id, depends_on_ids,
+                                            env_extra=env_extra)
+        task_id_map[task_name] = (task_id, task_data)
+
+        # The string conversion here is because if we use variables they are
+        # converted to a string, so it's easier to use a string always
+        if str(task.get("required", "True")) != "False" and task_name != "sink-task":
+            sink_task_depends_on.append(task_id)
+
+    for task_name, task in tasks.items():
+        if task_name == "sink-task":
+            # sink-task will be created below at the end of the ordered dict,
+            # so that it can depend on all other tasks.
+            continue
+        add_task(task_name, task)
+
+    # GitHub branch protection for pull requests needs us to name explicit
+    # required tasks - which doesn't suffice when using a dynamic task graph.
+    # To work around this we declare a sink task that depends on all the other
+    # tasks completing, and checks if they have succeeded. We can then
+    # make the sink task the sole required task for pull requests.
+    sink_task = tasks.get("sink-task")
+    if sink_task:
+        logger.info("Scheduling sink-task")
+        sink_task["command"] += " {}".format(" ".join(sink_task_depends_on))
+        task_id_map["sink-task"] = create_tc_task(
+            event, sink_task, taskgroup_id, sink_task_depends_on)
+    else:
+        logger.info("sink-task is not scheduled")
+
+    return task_id_map
+
+
+def create_tasks(queue, task_id_map):
+    for (task_id, task_data) in task_id_map.values():
+        queue.createTask(task_id, task_data)
+
+
+def get_event(queue, event_path):
+    if event_path is not None:
+        try:
+            with open(event_path) as f:
+                event_str = f.read()
+        except OSError:
+            logger.error("Missing event file at path %s" % event_path)
+            raise
+    elif "TASK_EVENT" in os.environ:
+        event_str = os.environ["TASK_EVENT"]
+    else:
+        event_str = fetch_event_data(queue)
+    if not event_str:
+        raise ValueError("Can't find GitHub event definition; for local testing pass --event-path")
+    try:
+        return json.loads(event_str)
+    except ValueError:
+        logger.error("Event was not valid JSON")
+        raise
+
+
+def decide(event):
+    all_tasks = taskgraph.load_tasks_from_path(os.path.join(here, "tasks", "test.yml"))
+
+    triggered_tasks = filter_triggers(event, all_tasks)
+    scheduled_tasks = filter_schedule_if(event, triggered_tasks)
+    filter_excluded_users(scheduled_tasks, event)
+
+    logger.info("UNSCHEDULED TASKS:\n  %s" % "\n  ".join(sorted(set(all_tasks.keys()) -
+                                                            set(scheduled_tasks.keys()))))
+    logger.info("SCHEDULED TASKS:\n  %s" % "\n  ".join(sorted(scheduled_tasks.keys())))
+
+    task_id_map = build_task_graph(event, all_tasks, scheduled_tasks)
+    return task_id_map
+
+
+def get_parser():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--event-path",
+                        help="Path to file containing serialized GitHub event")
+    parser.add_argument("--dry-run", action="store_true",
+                        help="Don't actually create the tasks, just output the tasks that "
+                        "would be created")
+    parser.add_argument("--tasks-path",
+                        help="Path to file in which to write payload for all scheduled tasks")
+    return parser
+
+
+def run(venv, **kwargs):
+    queue = taskcluster.Queue({'rootUrl': os.environ['TASKCLUSTER_PROXY_URL']})
+    event = get_event(queue, event_path=kwargs["event_path"])
+
+    task_id_map = decide(event)
+
+    try:
+        if not kwargs["dry_run"]:
+            create_tasks(queue, task_id_map)
+        else:
+            print(json.dumps(task_id_map, indent=2))
+    finally:
+        if kwargs["tasks_path"]:
+            with open(kwargs["tasks_path"], "w") as f:
+                json.dump(task_id_map, f, indent=2)
diff --git a/testing/web-platform/tests/tools/ci/tc/download.py b/testing/web-platform/tests/tools/ci/tc/download.py
new file mode 100644
index 0000000000..6a78935be4
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/download.py
@@ -0,0 +1,111 @@
+# mypy: allow-untyped-defs
+
+import argparse
+import os
+import logging
+
+import requests
+
+import github
+
+
+logging.basicConfig()
+logger = logging.getLogger("tc-download")
+
+# The root URL of the Taskcluster deployment from which to download wpt reports
+# (after https://bugzilla.mozilla.org/show_bug.cgi?id=1574668 lands, this will
+# be https://community-tc.services.mozilla.com)
+TASKCLUSTER_ROOT_URL = 'https://taskcluster.net'
+
+
+def get_parser():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--ref", action="store", default="master",
+                        help="Branch (in the GitHub repository) or commit to fetch logs for")
+    parser.add_argument("--artifact-name", action="store", default="wpt_report.json.gz",
+                        help="Log type to fetch")
+    parser.add_argument("--repo-name", action="store", default="web-platform-tests/wpt",
+                        help="GitHub repo name in the format owner/repo. "
+                        "This must be the repo from which the Taskcluster run was scheduled "
+                        "(for PRs this is the repo into which the PR would merge)")
+    parser.add_argument("--token-file", action="store",
+                        help="File containing GitHub token")
+    parser.add_argument("--out-dir", action="store", default=".",
+                        help="Path to save the logfiles")
+    return parser
+
+
+def get_json(url, key=None):
+    resp = requests.get(url)
+    resp.raise_for_status()
+    data = resp.json()
+    if key:
+        data = data[key]
+    return data
+
+
+def get(url, dest, name):
+    resp = requests.get(url)
+    resp.raise_for_status()
+    path = os.path.join(dest, name)
+    with open(path, "w") as f:
+        f.write(resp.content)
+    return path
+
+
+def run(*args, **kwargs):
+    if not os.path.exists(kwargs["out_dir"]):
+        os.mkdir(kwargs["out_dir"])
+
+    if kwargs["token_file"]:
+        with open(kwargs["token_file"]) as f:
+            gh = github.Github(f.read().strip())
+    else:
+        gh = github.Github()
+
+    repo = gh.get_repo(kwargs["repo_name"])
+    commit = repo.get_commit(kwargs["ref"])
+    statuses = commit.get_statuses()
+    taskgroups = set()
+
+    for status in statuses:
+        if not status.context.startswith("Taskcluster "):
+            continue
+        if status.state == "pending":
+            continue
+        taskgroup_id = status.target_url.rsplit("/", 1)[1]
+        taskgroups.add(taskgroup_id)
+
+    if not taskgroups:
+        logger.error("No complete Taskcluster runs found for ref %s" % kwargs["ref"])
+        return 1
+
+    for taskgroup in taskgroups:
+        if TASKCLUSTER_ROOT_URL == 'https://taskcluster.net':
+            # NOTE: this condition can be removed after November 9, 2019
+            taskgroup_url = "https://queue.taskcluster.net/v1/task-group/%s/list"
+            artifacts_list_url = "https://queue.taskcluster.net/v1/task/%s/artifacts"
+        else:
+            taskgroup_url = TASKCLUSTER_ROOT_URL + "/api/queue/v1/task-group/%s/list"
+            artifacts_list_url = TASKCLUSTER_ROOT_URL + "/api/queue/v1/task/%s/artifacts"
+        tasks = get_json(taskgroup_url % taskgroup, "tasks")
+        for task in tasks:
+            task_id = task["status"]["taskId"]
+            url = artifacts_list_url % (task_id,)
+            for artifact in get_json(url, "artifacts"):
+                if artifact["name"].endswith(kwargs["artifact_name"]):
+                    filename = "%s-%s-%s" % (task["task"]["metadata"]["name"],
+                                             task_id,
+                                             kwargs["artifact_name"])
+                    path = get("%s/%s" % (url, artifact["name"]), kwargs["out_dir"], filename)
+                    logger.info(path)
+
+
+def main():
+    kwargs = get_parser().parse_args()
+
+    run(None, vars(kwargs))
+
+
+if __name__ == "__main__":
+    main()  # type: ignore
diff --git a/testing/web-platform/tests/tools/ci/tc/github_checks_output.py b/testing/web-platform/tests/tools/ci/tc/github_checks_output.py
new file mode 100644
index 0000000000..a334d39eec
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/github_checks_output.py
@@ -0,0 +1,34 @@
+from typing import Optional, Text
+
+
+class GitHubChecksOutputter:
+    """Provides a method to output data to be shown in the GitHub Checks UI.
+
+    This can be useful to provide a summary of a given check (e.g. the lint)
+    to enable developers to quickly understand what has gone wrong. The output
+    supports markdown format.
+
+    https://docs.taskcluster.net/docs/reference/integrations/github/checks#custom-text-output-in-checks
+    """
+    def __init__(self, path: Text) -> None:
+        self.path = path
+
+    def output(self, line: Text) -> None:
+        with open(self.path, mode="a") as f:
+            f.write(line)
+            f.write("\n")
+
+
+__outputter = None
+
+
+def get_gh_checks_outputter(filepath: Optional[Text]) -> Optional[GitHubChecksOutputter]:
+    """Return the outputter for GitHub Checks output, if enabled.
+
+    :param filepath: The filepath to write GitHub Check output information to,
+                     or None if not enabled.
+    """
+    global __outputter
+    if filepath and __outputter is None:
+        __outputter = GitHubChecksOutputter(filepath)
+    return __outputter
diff --git a/testing/web-platform/tests/tools/ci/tc/sink_task.py b/testing/web-platform/tests/tools/ci/tc/sink_task.py
new file mode 100644
index 0000000000..ec3d5a47ca
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/sink_task.py
@@ -0,0 +1,65 @@
+# mypy: allow-untyped-defs
+
+import argparse
+import logging
+import os
+
+import taskcluster
+
+from .github_checks_output import get_gh_checks_outputter
+
+
+logging.basicConfig()
+logger = logging.getLogger()
+
+
+def check_task_statuses(task_ids, github_checks_outputter):
+    """Verifies whether a set of Taskcluster tasks completed successfully or not.
+
+    Returns 0 if all tasks passed completed successfully, 1 otherwise."""
+
+    queue = taskcluster.Queue({'rootUrl': os.environ['TASKCLUSTER_ROOT_URL']})
+    failed_tasks = []
+    for task in task_ids:
+        status = queue.status(task)
+        state = status['status']['state']
+        if state == 'failed' or state == 'exception':
+            logger.error(f'Task {task} failed with state "{state}"')
+            failed_tasks.append(status)
+        elif state != 'completed':
+            logger.error(f'Task {task} had unexpected state "{state}"')
+            failed_tasks.append(status)
+
+    if failed_tasks and github_checks_outputter:
+        github_checks_outputter.output('Failed tasks:')
+        for task in failed_tasks:
+            # We need to make an additional call to get the task name.
+            task_id = task['status']['taskId']
+            task_name = queue.task(task_id)['metadata']['name']
+            github_checks_outputter.output('* `{}` failed with status `{}`'.format(task_name, task['status']['state']))
+    else:
+        logger.info('All tasks completed successfully')
+        if github_checks_outputter:
+            github_checks_outputter.output('All tasks completed successfully')
+    return 1 if failed_tasks else 0
+
+
+def get_parser():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--github-checks-text-file", type=str,
+            help="Path to GitHub checks output file for Taskcluster runs")
+    parser.add_argument("tasks", nargs="+",
+            help="A set of Taskcluster task ids to verify the state of.")
+    return parser
+
+
+def run(venv, **kwargs):
+    github_checks_outputter = get_gh_checks_outputter(kwargs["github_checks_text_file"])
+
+    if github_checks_outputter:
+        github_checks_outputter.output(
+            "This check acts as a 'sink' for all other Taskcluster-based checks. "
+            "A failure here means that some other check has failed, which is the "
+            "real blocker.\n"
+        )
+    return check_task_statuses(kwargs['tasks'], github_checks_outputter)
diff --git a/testing/web-platform/tests/tools/ci/tc/taskgraph.py b/testing/web-platform/tests/tools/ci/tc/taskgraph.py
new file mode 100644
index 0000000000..54542ef0f8
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/taskgraph.py
@@ -0,0 +1,175 @@
+# mypy: allow-untyped-defs
+
+import json
+import os
+import re
+from collections import OrderedDict
+from copy import deepcopy
+
+import yaml
+
+here = os.path.dirname(__file__)
+
+
+def first(iterable):
+    # First item from a list or iterator
+    if not hasattr(iterable, "next"):
+        if hasattr(iterable, "__iter__"):
+            iterable = iter(iterable)
+        else:
+            raise ValueError("Object isn't iterable")
+    return next(iterable)
+
+
+def load_task_file(path):
+    with open(path) as f:
+        return yaml.safe_load(f)
+
+
+def update_recursive(data, update_data):
+    for key, value in update_data.items():
+        if key not in data:
+            data[key] = value
+        else:
+            initial_value = data[key]
+            if isinstance(value, dict):
+                if not isinstance(initial_value, dict):
+                    raise ValueError("Variable %s has inconsistent types "
+                                     "(expected object)" % key)
+                update_recursive(initial_value, value)
+            elif isinstance(value, list):
+                if not isinstance(initial_value, list):
+                    raise ValueError("Variable %s has inconsistent types "
+                                     "(expected list)" % key)
+                initial_value.extend(value)
+            else:
+                data[key] = value
+
+
+def resolve_use(task_data, templates):
+    rv = {}
+    if "use" in task_data:
+        for template_name in task_data["use"]:
+            update_recursive(rv, deepcopy(templates[template_name]))
+    update_recursive(rv, task_data)
+    rv.pop("use", None)
+    return rv
+
+
+def resolve_name(task_data, default_name):
+    if "name" not in task_data:
+        task_data["name"] = default_name
+    return task_data
+
+
+def resolve_chunks(task_data):
+    if "chunks" not in task_data:
+        return [task_data]
+    rv = []
+    total_chunks = task_data["chunks"]
+    if "chunks-override" in task_data:
+        override = task_data["chunks-override"].get(task_data["vars"]["test-type"])
+        if override is not None:
+            total_chunks = override
+    for i in range(1, total_chunks + 1):
+        chunk_data = deepcopy(task_data)
+        chunk_data["chunks"] = {"id": i,
+                                "total": total_chunks}
+        rv.append(chunk_data)
+    return rv
+
+
+def replace_vars(input_string, variables):
+    # TODO: support replacing as a non-string type?
+    variable_re = re.compile(r"(?<!\\)\${([^}]+)}")
+
+    def replacer(m):
+        var = m.group(1).split(".")
+        repl = variables
+        for part in var:
+            try:
+                repl = repl[part]
+            except Exception:
+                # Don't substitute
+                return m.group(0)
+        return str(repl)
+
+    return variable_re.sub(replacer, input_string)
+
+
+def sub_variables(data, variables):
+    if isinstance(data, str):
+        return replace_vars(data, variables)
+    if isinstance(data, list):
+        return [sub_variables(item, variables) for item in data]
+    if isinstance(data, dict):
+        return {key: sub_variables(value, variables)
+                for key, value in data.items()}
+    return data
+
+
+def substitute_variables(task):
+    variables = {"vars": task.get("vars", {}),
+                 "chunks": task.get("chunks", {})}
+
+    return sub_variables(task, variables)
+
+
+def expand_maps(task):
+    name = first(task.keys())
+    if name != "$map":
+        return [task]
+
+    map_data = task["$map"]
+    if set(map_data.keys()) != {"for", "do"}:
+        raise ValueError("$map objects must have exactly two properties named 'for' "
+                         "and 'do' (got %s)" % ("no properties" if not map_data.keys()
+                                                else ", ". join(map_data.keys())))
+    rv = []
+    for for_data in map_data["for"]:
+        do_items = map_data["do"]
+        if not isinstance(do_items, list):
+            do_items = expand_maps(do_items)
+        for do_data in do_items:
+            task_data = deepcopy(for_data)
+            if len(do_data.keys()) != 1:
+                raise ValueError("Each item in the 'do' list must be an object "
+                                 "with a single property")
+            name = first(do_data.keys())
+            update_recursive(task_data, deepcopy(do_data[name]))
+            rv.append({name: task_data})
+    return rv
+
+
+def load_tasks(tasks_data):
+    map_resolved_tasks = OrderedDict()
+    tasks = []
+
+    for task in tasks_data["tasks"]:
+        if len(task.keys()) != 1:
+            raise ValueError("Each task must be an object with a single property")
+        for task in expand_maps(task):
+            if len(task.keys()) != 1:
+                raise ValueError("Each task must be an object with a single property")
+            name = first(task.keys())
+            data = task[name]
+            new_name = sub_variables(name, {"vars": data.get("vars", {})})
+            if new_name in map_resolved_tasks:
+                raise ValueError("Got duplicate task name %s" % new_name)
+            map_resolved_tasks[new_name] = substitute_variables(data)
+
+    for task_default_name, data in map_resolved_tasks.items():
+        task = resolve_use(data, tasks_data["components"])
+        task = resolve_name(task, task_default_name)
+        tasks.extend(resolve_chunks(task))
+
+    tasks = [substitute_variables(task_data) for task_data in tasks]
+    return OrderedDict([(t["name"], t) for t in tasks])
+
+
+def load_tasks_from_path(path):
+    return load_tasks(load_task_file(path))
+
+
+def run(venv, **kwargs):
+    print(json.dumps(load_tasks_from_path(os.path.join(here, "tasks", "test.yml")), indent=2))
diff --git a/testing/web-platform/tests/tools/ci/tc/tasks/test.yml b/testing/web-platform/tests/tools/ci/tc/tasks/test.yml
new file mode 100644
index 0000000000..ea9c7f9dae
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/tasks/test.yml
@@ -0,0 +1,589 @@
+components:
+  wpt-base:
+    provisionerId: proj-wpt
+    workerType: ci
+    schedulerId: taskcluster-github
+    deadline: "24 hours"
+    image: webplatformtests/wpt:0.56
+    maxRunTime: 7200
+    artifacts:
+      public/results:
+        path: /home/test/artifacts
+        type: directory
+    extra:
+      github:
+        customCheckRun:
+          textArtifactName: public/results/checkrun.md
+
+  wpt-testharness:
+    chunks: 16
+    maxRunTime: 10800
+    vars:
+      test-type: testharness
+
+  wpt-reftest:
+    chunks: 6
+    vars:
+      test-type: reftest
+
+  wpt-print-reftest:
+    chunks: 1
+    vars:
+      test-type: print-reftest
+
+  wpt-wdspec:
+    chunks: 2
+    vars:
+      test-type: wdspec
+
+  wpt-crashtest:
+    chunks: 1
+    vars:
+      test-type: crashtest
+
+  run-options:
+    options:
+      xvfb: true
+      oom-killer: true
+      hosts: true
+      install-certificates: true
+
+  wpt-run:
+    name: wpt-${vars.browser}-${vars.channel}-${vars.suite}-${chunks.id}
+    options:
+      browser:
+        - ${vars.browser}
+      channel: ${vars.channel}
+    command: >-
+      ./tools/ci/taskcluster-run.py
+      ${vars.browser}
+      ${vars.channel}
+      --
+      --channel=${vars.channel}
+      --log-wptreport=../artifacts/wpt_report.json
+      --log-wptscreenshot=../artifacts/wpt_screenshot.txt
+      --no-fail-on-unexpected
+      --this-chunk=${chunks.id}
+      --total-chunks=${chunks.total}
+      --test-type=${vars.suite}
+
+  trigger-master:
+    trigger:
+      branch:
+        - master
+
+  trigger-push:
+    trigger:
+      branch:
+        - triggers/${vars.browser}_${vars.channel}
+
+  trigger-daily:
+    trigger:
+      branch:
+        - epochs/daily
+
+  trigger-weekly:
+    trigger:
+      branch:
+        - epochs/weekly
+
+  trigger-pr:
+    trigger:
+      pull-request:
+
+  browser-firefox:
+    depends-on:
+      - download-firefox-${vars.channel}
+    download-artifacts:
+      - task: download-firefox-${vars.channel}
+        glob: public/results/firefox-${vars.channel}.*
+        dest: build/
+        extract: true
+
+  browser-webkitgtk_minibrowser: {}
+
+  browser-chrome: {}
+
+  browser-chromium: {}
+
+  browser-servo: {}
+
+  browser-firefox_android:
+    privileged: true
+    scopes:
+      - "docker-worker:capability:privileged"
+    chunks-override:
+      testharness: 24
+
+  tox-python3_7:
+    env:
+      TOXENV: py37
+      PY_COLORS: "0"
+    install:
+      - python3.7
+      - python3.7-distutils
+      - python3.7-dev
+      - python3.7-venv
+
+  tox-python3_11:
+    env:
+      TOXENV: py311
+      PY_COLORS: "0"
+    install:
+      - python3.11
+      - python3.11-distutils
+      - python3.11-dev
+      - python3.11-venv
+  tests-affected:
+    options:
+      browser:
+        - ${vars.browser}
+      channel: ${vars.channel}
+    schedule-if:
+      run-job:
+        - affected_tests
+
+tasks:
+  # The scheduling order of tasks is NOT determined by the order in which they
+  # are defined, but by their dependencies (depends-on).
+
+  # Run full suites on push
+  - $map:
+      for:
+        - vars:
+            suite: testharness
+        - vars:
+            suite: reftest
+        - vars:
+            suite: wdspec
+        - vars:
+            suite: crashtest
+      do:
+        $map:
+          for:
+            - vars:
+                browser: firefox
+                channel: nightly
+              use:
+                - trigger-master
+                - trigger-push
+            - vars:
+                browser: firefox
+                channel: beta
+              use:
+                - trigger-weekly
+                - trigger-push
+            - vars:
+                browser: firefox
+                channel: stable
+              use:
+                - trigger-daily
+                - trigger-push
+            - vars:
+                # Chromium ToT
+                browser: chromium
+                channel: nightly
+              use:
+                - trigger-daily
+                - trigger-push
+            - vars:
+                browser: chrome
+                channel: canary
+              use:
+                - trigger-master
+                - trigger-push
+            - vars:
+                browser: chrome
+                channel: dev
+              use:
+                - trigger-master
+                - trigger-push
+            - vars:
+                browser: chrome
+                channel: beta
+              use:
+                - trigger-weekly
+                - trigger-push
+            - vars:
+                browser: chrome
+                channel: stable
+              use:
+                - trigger-daily
+                - trigger-push
+            - vars:
+                browser: webkitgtk_minibrowser
+                channel: nightly
+              use:
+                - trigger-daily
+                - trigger-push
+            - vars:
+                browser: webkitgtk_minibrowser
+                channel: stable
+              use:
+                - trigger-weekly
+                - trigger-push
+            - vars:
+                browser: webkitgtk_minibrowser
+                channel: beta
+              use:
+                - trigger-weekly
+                - trigger-push
+            - vars:
+                browser: servo
+                channel: nightly
+              use:
+                - trigger-weekly
+                - trigger-push
+            - vars:
+                browser: firefox_android
+                channel: nightly
+              use:
+                - trigger-daily
+                - trigger-push
+          do:
+            - ${vars.browser}-${vars.channel}-${vars.suite}:
+                use:
+                  - wpt-base
+                  - run-options
+                  - wpt-run
+                  - browser-${vars.browser}
+                  - wpt-${vars.suite}
+                description: >-
+                  A subset of WPT's "${vars.suite}" tests (chunk number ${chunks.id}
+                  of ${chunks.total}), run in the ${vars.channel} release of
+                  ${vars.browser}.
+
+  # print-reftest are currently only supported by Chrome and Firefox.
+  - $map:
+      for:
+        - vars:
+            suite: print-reftest
+      do:
+        $map:
+          for:
+            - vars:
+                browser: firefox
+                channel: nightly
+              use:
+                - trigger-master
+                - trigger-push
+            - vars:
+                browser: firefox
+                channel: beta
+              use:
+                - trigger-weekly
+                - trigger-push
+            - vars:
+                browser: firefox
+                channel: stable
+              use:
+                - trigger-daily
+                - trigger-push
+            - vars:
+                # Chromium ToT
+                browser: chromium
+                channel: nightly
+              use:
+                - trigger-daily
+                - trigger-push
+            - vars:
+                browser: chrome
+                channel: canary
+              use:
+                - trigger-master
+                - trigger-push
+            - vars:
+                browser: chrome
+                channel: dev
+              use:
+                - trigger-master
+                - trigger-push
+            - vars:
+                browser: chrome
+                channel: beta
+              use:
+                - trigger-weekly
+                - trigger-push
+            - vars:
+                browser: chrome
+                channel: stable
+              use:
+                - trigger-daily
+                - trigger-push
+          do:
+            - ${vars.browser}-${vars.channel}-${vars.suite}:
+                use:
+                  - wpt-base
+                  - run-options
+                  - wpt-run
+                  - browser-${vars.browser}
+                  - wpt-${vars.suite}
+                description: >-
+                  A subset of WPT's "${vars.suite}" tests (chunk number ${chunks.id}
+                  of ${chunks.total}), run in the ${vars.channel} release of
+                  ${vars.browser}.
+
+  - $map:
+      for:
+        - vars:
+            browser: firefox
+            channel: nightly
+            stability-exclude-users:
+              - moz-wptsync-bot
+            required: true
+        - vars:
+            browser: chrome
+            channel: dev
+            stability-exclude-users:
+              - chromium-wpt-export-bot
+            required: false
+      do:
+        - wpt-${vars.browser}-${vars.channel}-stability:
+            use:
+              - wpt-base
+              - run-options
+              - browser-${vars.browser}
+              - trigger-pr
+              - tests-affected
+            description: >-
+              Verify that all tests affected by a pull request are stable
+              when executed in ${vars.browser}.
+            command: >-
+              ./tools/ci/taskcluster-run.py
+              --commit-range base_head
+              ${vars.browser}
+              ${vars.channel}
+              --
+              --channel=${vars.channel}
+              --verify
+              --verify-no-chaos-mode
+              --verify-repeat-loop=0
+              --verify-repeat-restart=10
+              --github-checks-text-file="/home/test/artifacts/checkrun.md"
+            exclude-users: ${vars.stability-exclude-users}
+            required: ${vars.required}
+
+        - wpt-${vars.browser}-${vars.channel}-results:
+            use:
+              - wpt-base
+              - run-options
+              - browser-${vars.browser}
+              - trigger-pr
+              - tests-affected
+            description: >-
+              Collect results for all tests affected by a pull request in
+              ${vars.browser}.
+            command: >-
+              ./tools/ci/taskcluster-run.py
+              --commit-range base_head
+              ${vars.browser}
+              ${vars.channel}
+              --
+              --channel=${vars.channel}
+              --no-fail-on-unexpected
+              --log-wptreport=../artifacts/wpt_report.json
+              --log-wptscreenshot=../artifacts/wpt_screenshot.txt
+
+        - wpt-${vars.browser}-${vars.channel}-results-without-changes:
+            use:
+              - wpt-base
+              - run-options
+              - browser-${vars.browser}
+              - trigger-pr
+              - tests-affected
+            options:
+              checkout: base_head
+            description: >-
+              Collect results for all tests affected by a pull request in
+              ${vars.browser} but without the changes in the PR.
+            command: >-
+              ./tools/ci/taskcluster-run.py
+              --commit-range task_head
+              ${vars.browser}
+              ${vars.channel}
+              --
+              --channel=${vars.channel}
+              --no-fail-on-unexpected
+              --log-wptreport=../artifacts/wpt_report.json
+              --log-wptscreenshot=../artifacts/wpt_screenshot.txt
+  - $map:
+      for:
+        - vars:
+            channel: nightly
+        - vars:
+            channel: beta
+        - vars:
+            channel: stable
+      do:
+        download-firefox-${vars.channel}:
+          use:
+            - wpt-base
+          command: "./wpt install --download-only --destination /home/test/artifacts/ --channel=${vars.channel}  --rename=firefox-${vars.channel} firefox browser"
+
+  - lint:
+      use:
+        - wpt-base
+        - trigger-master
+        - trigger-pr
+      description: >-
+        Lint for wpt-specific requirements
+      command: "./wpt lint --all --github-checks-text-file=/home/test/artifacts/checkrun.md"
+
+  - update-built:
+      use:
+        - wpt-base
+        - trigger-pr
+      schedule-if:
+        run-job:
+          - update_built
+      command: "./tools/ci/ci_built_diff.sh"
+
+  - tools/ unittests (Python 3.7):
+      description: >-
+        Unit tests for tools running under Python 3.7, excluding wptrunner
+      use:
+        - wpt-base
+        - trigger-pr
+        - tox-python3_7
+      command: ./tools/ci/ci_tools_unittest.sh
+      env:
+        HYPOTHESIS_PROFILE: ci
+      schedule-if:
+        run-job:
+          - tools_unittest
+
+  - tools/ unittests (Python 3.11):
+      description: >-
+        Unit tests for tools running under Python 3.11, excluding wptrunner
+      use:
+        - wpt-base
+        - trigger-pr
+        - tox-python3_11
+      command: ./tools/ci/ci_tools_unittest.sh
+      env:
+        HYPOTHESIS_PROFILE: ci
+      schedule-if:
+        run-job:
+          - tools_unittest
+
+  - tools/ integration tests (Python 3.7):
+      description: >-
+        Integration tests for tools running under Python 3.7
+      use:
+        - wpt-base
+        - trigger-pr
+        - tox-python3_7
+      command: ./tools/ci/ci_tools_integration_test.sh
+      install:
+        - libnss3-tools
+      options:
+        oom-killer: true
+        browser:
+          - firefox
+          - chrome
+        channel: experimental
+        xvfb: true
+        hosts: true
+      schedule-if:
+        run-job:
+          - wpt_integration
+
+  - tools/ integration tests (Python 3.11):
+      description: >-
+        Integration tests for tools running under Python 3.11
+      use:
+        - wpt-base
+        - trigger-pr
+        - tox-python3_11
+      command: ./tools/ci/ci_tools_integration_test.sh
+      install:
+        - libnss3-tools
+      options:
+        oom-killer: true
+        browser:
+          - firefox
+          - chrome
+        channel: experimental
+        xvfb: true
+        hosts: true
+      schedule-if:
+        run-job:
+          - wpt_integration
+
+  - resources/ tests (Python 3.7):
+      description: >-
+        Tests for testharness.js and other files in resources/ under Python 3.7
+      use:
+        - wpt-base
+        - trigger-pr
+        - tox-python3_7
+      command: ./tools/ci/ci_resources_unittest.sh
+      install:
+        - libnss3-tools
+      options:
+        browser:
+          - firefox
+        xvfb: true
+        hosts: true
+      schedule-if:
+        run-job:
+          - resources_unittest
+
+  - resources/ tests (Python 3.11):
+      description: >-
+        Tests for testharness.js and other files in resources/ under Python 3.11
+      use:
+        - wpt-base
+        - trigger-pr
+        - tox-python3_11
+      command: ./tools/ci/ci_resources_unittest.sh
+      install:
+        - libnss3-tools
+      options:
+        browser:
+          - firefox
+        xvfb: true
+        hosts: true
+      schedule-if:
+        run-job:
+          - resources_unittest
+
+  - infrastructure/ tests:
+      description: >-
+        Smoketests for wptrunner
+      vars:
+        channel: nightly
+      use:
+        - wpt-base
+        - trigger-pr
+        - browser-firefox
+        - browser-firefox_android
+      command: ./tools/ci/ci_wptrunner_infrastructure.sh
+      install:
+        - python3-pip
+        - libnss3-tools
+        - libappindicator1
+        - fonts-liberation
+      options:
+        oom-killer: true
+        browser:
+          - firefox
+          - chrome
+          - firefox_android
+        channel: experimental
+        xvfb: true
+        hosts: false
+      schedule-if:
+        run-job:
+          - wptrunner_infrastructure
+
+  # Note: even though sink-task does not have `depends-on`, it depends on all
+  # other tasks (dynamically added by tools/ci/tc/decision.py).
+  - sink-task:
+      description: >-
+        Sink task for all other tasks; indicates success
+      use:
+        - wpt-base
+        - trigger-pr
+      command: "./wpt tc-sink-task --github-checks-text-file=/home/test/artifacts/checkrun.md"
+      requires: all-resolved
diff --git a/testing/web-platform/tests/tools/ci/tc/testdata/epochs_daily_push_event.json b/testing/web-platform/tests/tools/ci/tc/testdata/epochs_daily_push_event.json
new file mode 100644
index 0000000000..0f74c315d2
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/testdata/epochs_daily_push_event.json
@@ -0,0 +1,460 @@
+{
+  "ref": "refs/heads/epochs/daily",
+  "before": "20bb1ca5db519ee5d37ece6492868f8a6b65a2e7",
+  "after": "5df56b25e1cb81f81fe16c88be839f9fd538b41e",
+  "repository": {
+    "id": 3618133,
+    "node_id": "MDEwOlJlcG9zaXRvcnkzNjE4MTMz",
+    "name": "wpt",
+    "full_name": "web-platform-tests/wpt",
+    "private": false,
+    "owner": {
+      "name": "web-platform-tests",
+      "email": null,
+      "login": "web-platform-tests",
+      "id": 37226233,
+      "node_id": "MDEyOk9yZ2FuaXphdGlvbjM3MjI2MjMz",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/37226233?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/web-platform-tests",
+      "html_url": "https://github.com/web-platform-tests",
+      "followers_url": "https://api.github.com/users/web-platform-tests/followers",
+      "following_url": "https://api.github.com/users/web-platform-tests/following{/other_user}",
+      "gists_url": "https://api.github.com/users/web-platform-tests/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/web-platform-tests/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/web-platform-tests/subscriptions",
+      "organizations_url": "https://api.github.com/users/web-platform-tests/orgs",
+      "repos_url": "https://api.github.com/users/web-platform-tests/repos",
+      "events_url": "https://api.github.com/users/web-platform-tests/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/web-platform-tests/received_events",
+      "type": "Organization",
+      "site_admin": false
+    },
+    "html_url": "https://github.com/web-platform-tests/wpt",
+    "description": "Test suites for Web platform specs — including WHATWG, W3C, and others",
+    "fork": false,
+    "url": "https://github.com/web-platform-tests/wpt",
+    "forks_url": "https://api.github.com/repos/web-platform-tests/wpt/forks",
+    "keys_url": "https://api.github.com/repos/web-platform-tests/wpt/keys{/key_id}",
+    "collaborators_url": "https://api.github.com/repos/web-platform-tests/wpt/collaborators{/collaborator}",
+    "teams_url": "https://api.github.com/repos/web-platform-tests/wpt/teams",
+    "hooks_url": "https://api.github.com/repos/web-platform-tests/wpt/hooks",
+    "issue_events_url": "https://api.github.com/repos/web-platform-tests/wpt/issues/events{/number}",
+    "events_url": "https://api.github.com/repos/web-platform-tests/wpt/events",
+    "assignees_url": "https://api.github.com/repos/web-platform-tests/wpt/assignees{/user}",
+    "branches_url": "https://api.github.com/repos/web-platform-tests/wpt/branches{/branch}",
+    "tags_url": "https://api.github.com/repos/web-platform-tests/wpt/tags",
+    "blobs_url": "https://api.github.com/repos/web-platform-tests/wpt/git/blobs{/sha}",
+    "git_tags_url": "https://api.github.com/repos/web-platform-tests/wpt/git/tags{/sha}",
+    "git_refs_url": "https://api.github.com/repos/web-platform-tests/wpt/git/refs{/sha}",
+    "trees_url": "https://api.github.com/repos/web-platform-tests/wpt/git/trees{/sha}",
+    "statuses_url": "https://api.github.com/repos/web-platform-tests/wpt/statuses/{sha}",
+    "languages_url": "https://api.github.com/repos/web-platform-tests/wpt/languages",
+    "stargazers_url": "https://api.github.com/repos/web-platform-tests/wpt/stargazers",
+    "contributors_url": "https://api.github.com/repos/web-platform-tests/wpt/contributors",
+    "subscribers_url": "https://api.github.com/repos/web-platform-tests/wpt/subscribers",
+    "subscription_url": "https://api.github.com/repos/web-platform-tests/wpt/subscription",
+    "commits_url": "https://api.github.com/repos/web-platform-tests/wpt/commits{/sha}",
+    "git_commits_url": "https://api.github.com/repos/web-platform-tests/wpt/git/commits{/sha}",
+    "comments_url": "https://api.github.com/repos/web-platform-tests/wpt/comments{/number}",
+    "issue_comment_url": "https://api.github.com/repos/web-platform-tests/wpt/issues/comments{/number}",
+    "contents_url": "https://api.github.com/repos/web-platform-tests/wpt/contents/{+path}",
+    "compare_url": "https://api.github.com/repos/web-platform-tests/wpt/compare/{base}...{head}",
+    "merges_url": "https://api.github.com/repos/web-platform-tests/wpt/merges",
+    "archive_url": "https://api.github.com/repos/web-platform-tests/wpt/{archive_format}{/ref}",
+    "downloads_url": "https://api.github.com/repos/web-platform-tests/wpt/downloads",
+    "issues_url": "https://api.github.com/repos/web-platform-tests/wpt/issues{/number}",
+    "pulls_url": "https://api.github.com/repos/web-platform-tests/wpt/pulls{/number}",
+    "milestones_url": "https://api.github.com/repos/web-platform-tests/wpt/milestones{/number}",
+    "notifications_url": "https://api.github.com/repos/web-platform-tests/wpt/notifications{?since,all,participating}",
+    "labels_url": "https://api.github.com/repos/web-platform-tests/wpt/labels{/name}",
+    "releases_url": "https://api.github.com/repos/web-platform-tests/wpt/releases{/id}",
+    "deployments_url": "https://api.github.com/repos/web-platform-tests/wpt/deployments",
+    "created_at": 1330865891,
+    "updated_at": "2019-11-30T21:34:30Z",
+    "pushed_at": 1575160610,
+    "git_url": "git://github.com/web-platform-tests/wpt.git",
+    "ssh_url": "git@github.com:web-platform-tests/wpt.git",
+    "clone_url": "https://github.com/web-platform-tests/wpt.git",
+    "svn_url": "https://github.com/web-platform-tests/wpt",
+    "homepage": "https://web-platform-tests.org/",
+    "size": 329465,
+    "stargazers_count": 2543,
+    "watchers_count": 2543,
+    "language": "HTML",
+    "has_issues": true,
+    "has_projects": true,
+    "has_downloads": true,
+    "has_wiki": true,
+    "has_pages": true,
+    "forks_count": 1838,
+    "mirror_url": null,
+    "archived": false,
+    "disabled": false,
+    "open_issues_count": 1590,
+    "license": {
+      "key": "other",
+      "name": "Other",
+      "spdx_id": "NOASSERTION",
+      "url": null,
+      "node_id": "MDc6TGljZW5zZTA="
+    },
+    "forks": 1838,
+    "open_issues": 1590,
+    "watchers": 2543,
+    "default_branch": "master",
+    "stargazers": 2543,
+    "master_branch": "master",
+    "organization": "web-platform-tests"
+  },
+  "pusher": {
+    "name": "github-actions[bot]",
+    "email": null
+  },
+  "organization": {
+    "login": "web-platform-tests",
+    "id": 37226233,
+    "node_id": "MDEyOk9yZ2FuaXphdGlvbjM3MjI2MjMz",
+    "url": "https://api.github.com/orgs/web-platform-tests",
+    "repos_url": "https://api.github.com/orgs/web-platform-tests/repos",
+    "events_url": "https://api.github.com/orgs/web-platform-tests/events",
+    "hooks_url": "https://api.github.com/orgs/web-platform-tests/hooks",
+    "issues_url": "https://api.github.com/orgs/web-platform-tests/issues",
+    "members_url": "https://api.github.com/orgs/web-platform-tests/members{/member}",
+    "public_members_url": "https://api.github.com/orgs/web-platform-tests/public_members{/member}",
+    "avatar_url": "https://avatars0.githubusercontent.com/u/37226233?v=4",
+    "description": ""
+  },
+  "sender": {
+    "login": "github-actions[bot]",
+    "id": 41898282,
+    "node_id": "MDM6Qm90NDE4OTgyODI=",
+    "avatar_url": "https://avatars2.githubusercontent.com/in/15368?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/github-actions%5Bbot%5D",
+    "html_url": "https://github.com/apps/github-actions",
+    "followers_url": "https://api.github.com/users/github-actions%5Bbot%5D/followers",
+    "following_url": "https://api.github.com/users/github-actions%5Bbot%5D/following{/other_user}",
+    "gists_url": "https://api.github.com/users/github-actions%5Bbot%5D/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/github-actions%5Bbot%5D/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/github-actions%5Bbot%5D/subscriptions",
+    "organizations_url": "https://api.github.com/users/github-actions%5Bbot%5D/orgs",
+    "repos_url": "https://api.github.com/users/github-actions%5Bbot%5D/repos",
+    "events_url": "https://api.github.com/users/github-actions%5Bbot%5D/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/github-actions%5Bbot%5D/received_events",
+    "type": "Bot",
+    "site_admin": false
+  },
+  "created": false,
+  "deleted": false,
+  "forced": false,
+  "base_ref": "refs/heads/epochs/six_hourly",
+  "compare": "https://github.com/web-platform-tests/wpt/compare/20bb1ca5db51...5df56b25e1cb",
+  "commits": [
+    {
+      "id": "3503c50a6452e153bde906a9c6644cb6237224fc",
+      "tree_id": "b735fa0ae88ebe0abd6764a1afd63aea815ac18e",
+      "distinct": false,
+      "message": "[LayoutNG] Pixel-snap column rules.\n\nBug: 829028\nChange-Id: I252901109502256f14bc68e64d4303006db50a13\nReviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1944350\nCommit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>\nReviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>\nCr-Commit-Position: refs/heads/master@{#720302}",
+      "timestamp": "2019-11-29T16:25:44-08:00",
+      "url": "https://github.com/web-platform-tests/wpt/commit/3503c50a6452e153bde906a9c6644cb6237224fc",
+      "author": {
+        "name": "Morten Stenshorne",
+        "email": "mstensho@chromium.org",
+        "username": "mstensho"
+      },
+      "committer": {
+        "name": "Blink WPT Bot",
+        "email": "blink-w3c-test-autoroller@chromium.org",
+        "username": "chromium-wpt-export-bot"
+      },
+      "added": [
+        "css/css-multicol/equal-gap-and-rule.html"
+      ],
+      "removed": [
+
+      ],
+      "modified": [
+
+      ]
+    },
+    {
+      "id": "561b765308e6d188618f3ba73091bb598d8357ce",
+      "tree_id": "775ac4481c03e020819910d03019f0ec93def868",
+      "distinct": false,
+      "message": "Fix parser mXSS sanitizer bypass for <p> and <br> within foreign context\n\nPrior to this CL, the following code:\n <svg></p></svg>\nparsed to this innerHTML: <svg><p></p></svg>\n\nThis is in contrast to this code:\n <svg><p></svg>\nwhich parses to <svg></svg><p></p>\n\nThe fact that the </p> is left inside the <svg> allowed sanitizer\nbypasses as detailed in [1]. Please also see [2] for the spec\ndiscussion.\n\nWith this CL, </p> and </br> within a foreign context now cause\nthe closing of the foreign context.\n\n[1] https://research.securitum.com/dompurify-bypass-using-mxss/\n[2] https://github.com/whatwg/html/issues/5113\n\nBug: 1005713\nChange-Id: Ic07ee50de4eb1ef19b73a075bd83785c99f4f891\nReviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940722\nReviewed-by: Kouhei Ueno <kouhei@chromium.org>\nCommit-Queue: Mason Freed <masonfreed@chromium.org>\nCr-Commit-Position: refs/heads/master@{#720315}",
+      "timestamp": "2019-11-30T00:22:29-08:00",
+      "url": "https://github.com/web-platform-tests/wpt/commit/561b765308e6d188618f3ba73091bb598d8357ce",
+      "author": {
+        "name": "Mason Freed",
+        "email": "masonfreed@chromium.org",
+        "username": "mfreed7"
+      },
+      "committer": {
+        "name": "Blink WPT Bot",
+        "email": "blink-w3c-test-autoroller@chromium.org",
+        "username": "chromium-wpt-export-bot"
+      },
+      "added": [
+        "html/syntax/parsing/html_content_in_foreign_context.html"
+      ],
+      "removed": [
+
+      ],
+      "modified": [
+
+      ]
+    },
+    {
+      "id": "d31800185dab8e194294620c8ad6bf40f25bf752",
+      "tree_id": "c718a913e9a5197e1896f5b2ee0434f896d6725b",
+      "distinct": false,
+      "message": "[css-text-4] tests for word-boundary-expansion\n\nhttps://drafts.csswg.org/css-text-4/#word-boundary-expansion",
+      "timestamp": "2019-11-30T18:09:49+09:00",
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index 0000000000..8e79f75373
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index 0000000000..792ea1bccc
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+    "forks_count": 1837,
+    "mirror_url": null,
+    "archived": false,
+    "disabled": false,
+    "open_issues_count": 1576,
+    "license": {
+      "key": "other",
+      "name": "Other",
+      "spdx_id": "NOASSERTION",
+      "url": null,
+      "node_id": "MDc6TGljZW5zZTA="
+    },
+    "forks": 1837,
+    "open_issues": 1576,
+    "watchers": 2536,
+    "default_branch": "master"
+  },
+  "organization": {
+    "login": "web-platform-tests",
+    "id": 37226233,
+    "node_id": "MDEyOk9yZ2FuaXphdGlvbjM3MjI2MjMz",
+    "url": "https://api.github.com/orgs/web-platform-tests",
+    "repos_url": "https://api.github.com/orgs/web-platform-tests/repos",
+    "events_url": "https://api.github.com/orgs/web-platform-tests/events",
+    "hooks_url": "https://api.github.com/orgs/web-platform-tests/hooks",
+    "issues_url": "https://api.github.com/orgs/web-platform-tests/issues",
+    "members_url": "https://api.github.com/orgs/web-platform-tests/members{/member}",
+    "public_members_url": "https://api.github.com/orgs/web-platform-tests/public_members{/member}",
+    "avatar_url": "https://avatars0.githubusercontent.com/u/37226233?v=4",
+    "description": ""
+  },
+  "sender": {
+    "login": "chromium-wpt-export-bot",
+    "id": 25752892,
+    "node_id": "MDQ6VXNlcjI1NzUyODky",
+    "avatar_url": "https://avatars1.githubusercontent.com/u/25752892?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/chromium-wpt-export-bot",
+    "html_url": "https://github.com/chromium-wpt-export-bot",
+    "followers_url": "https://api.github.com/users/chromium-wpt-export-bot/followers",
+    "following_url": "https://api.github.com/users/chromium-wpt-export-bot/following{/other_user}",
+    "gists_url": "https://api.github.com/users/chromium-wpt-export-bot/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/chromium-wpt-export-bot/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/chromium-wpt-export-bot/subscriptions",
+    "organizations_url": "https://api.github.com/users/chromium-wpt-export-bot/orgs",
+    "repos_url": "https://api.github.com/users/chromium-wpt-export-bot/repos",
+    "events_url": "https://api.github.com/users/chromium-wpt-export-bot/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/chromium-wpt-export-bot/received_events",
+    "type": "User",
+    "site_admin": false
+  }
+}
diff --git a/testing/web-platform/tests/tools/ci/tc/tests/__init__.py b/testing/web-platform/tests/tools/ci/tc/tests/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/testing/web-platform/tests/tools/ci/tc/tests/test_decision.py b/testing/web-platform/tests/tools/ci/tc/tests/test_decision.py
new file mode 100644
index 0000000000..f702466421
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/tests/test_decision.py
@@ -0,0 +1,56 @@
+# mypy: allow-untyped-defs
+
+from unittest import mock
+
+import pytest
+
+from tools.ci.tc import decision
+
+
+@pytest.mark.parametrize("run_jobs,tasks,expected", [
+    ([], {"task-no-schedule-if": {}}, ["task-no-schedule-if"]),
+    ([], {"task-schedule-if-no-run-job": {"schedule-if": {}}}, []),
+    (["job"],
+     {"job-present": {"schedule-if": {"run-job": ["other-job", "job"]}}},
+     ["job-present"]),
+    (["job"], {"job-missing": {"schedule-if": {"run-job": ["other-job"]}}}, []),
+    (["all"], {"job-all": {"schedule-if": {"run-job": ["other-job"]}}}, ["job-all"]),
+    (["job"],
+     {"job-1": {"schedule-if": {"run-job": ["job"]}},
+      "job-2": {"schedule-if": {"run-job": ["other-job"]}}},
+     ["job-1"]),
+])
+def test_filter_schedule_if(run_jobs, tasks, expected):
+    with mock.patch("tools.ci.tc.decision.get_run_jobs",
+                    return_value=run_jobs) as get_run_jobs:
+        assert (decision.filter_schedule_if({}, tasks) ==
+                {name: tasks[name] for name in expected})
+        get_run_jobs.call_count in (0, 1)
+
+
+@pytest.mark.parametrize("msg,expected", [
+    ("Some initial line\n\ntc-jobs:foo,bar", {"foo", "bar"}),
+    ("Some initial line\n\ntc-jobs:foo, bar", {"foo", "bar"}),
+    ("tc-jobs:foo, bar   \nbaz", {"foo", "bar"}),
+    ("tc-jobs:all", {"all"}),
+    ("", set()),
+    ("tc-jobs:foo\ntc-jobs:bar", {"foo"})])
+@pytest.mark.parametrize("event", [
+    {"commits": [{"message": "<message>"}]},
+    {"pull_request": {"body": "<message>"}}
+])
+def test_extra_jobs_pr(msg, expected, event):
+    def sub(obj):
+        """Copy obj, except if it's a string with the value <message>
+        replace it with the value of the msg argument"""
+        if isinstance(obj, dict):
+            return {key: sub(value) for (key, value) in obj.items()}
+        elif isinstance(obj, list):
+            return [sub(value) for value in obj]
+        elif obj == "<message>":
+            return msg
+        return obj
+
+    event = sub(event)
+
+    assert decision.get_extra_jobs(event) == expected
diff --git a/testing/web-platform/tests/tools/ci/tc/tests/test_taskgraph.py b/testing/web-platform/tests/tools/ci/tc/tests/test_taskgraph.py
new file mode 100644
index 0000000000..57528a6659
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/tests/test_taskgraph.py
@@ -0,0 +1,148 @@
+# mypy: allow-untyped-defs
+
+import pytest
+import yaml
+
+from tools.ci.tc import taskgraph
+
+@pytest.mark.parametrize("data, update_data, expected", [
+    ({"a": 1}, {"b": 2}, {"a": 1, "b": 2}),
+    ({"a": 1}, {"a": 2}, {"a": 2}),
+    ({"a": [1]}, {"a": [2]}, {"a": [1, 2]}),
+    ({"a": {"b": 1, "c": 2}}, {"a": {"b": 2, "d": 3}}, {"a": {"b": 2, "c": 2, "d": 3}}),
+    ({"a": {"b": [1]}}, {"a": {"b": [2]}}, {"a": {"b": [1, 2]}}),
+]
+)
+def test_update_recursive(data, update_data, expected):
+    taskgraph.update_recursive(data, update_data)
+    assert data == expected
+
+
+def test_use():
+    data = """
+components:
+  component1:
+    a: 1
+    b: [1]
+    c: "c"
+  component2:
+    a: 2
+    b: [2]
+    d: "d"
+tasks:
+  - task1:
+      use:
+       - component1
+       - component2
+      b: [3]
+      c: "e"
+"""
+    tasks_data = yaml.safe_load(data)
+    assert taskgraph.load_tasks(tasks_data) == {
+        "task1": {
+            "a": 2,
+            "b": [1,2,3],
+            "c": "e",
+            "d": "d",
+            "name": "task1"
+        }
+    }
+
+
+def test_var():
+    data = """
+components:
+  component1:
+    a: ${vars.value}
+tasks:
+  - task1:
+      use:
+       - component1
+      vars:
+        value: 1
+"""
+    tasks_data = yaml.safe_load(data)
+    assert taskgraph.load_tasks(tasks_data) == {
+        "task1": {
+            "a": "1",
+            "vars": {"value": 1},
+            "name": "task1"
+        }
+    }
+
+
+def test_map():
+    data = """
+components: {}
+tasks:
+ - $map:
+     for:
+       - vars:
+           a: 1
+         b: [1]
+       - vars:
+           a: 2
+         b: [2]
+     do:
+       - task1-${vars.a}:
+           a: ${vars.a}
+           b: [3]
+       - task2-${vars.a}:
+           a: ${vars.a}
+           b: [4]
+"""
+    tasks_data = yaml.safe_load(data)
+    assert taskgraph.load_tasks(tasks_data) == {
+        "task1-1": {
+            "a": "1",
+            "b": [1, 3],
+            "vars": {"a": 1},
+            "name": "task1-1"
+        },
+        "task1-2": {
+            "a": "2",
+            "b": [2, 3],
+            "vars": {"a": 2},
+            "name": "task1-2"
+        },
+        "task2-1": {
+            "a": "1",
+            "b": [1, 4],
+            "vars": {"a": 1},
+            "name": "task2-1"
+        },
+        "task2-2": {
+            "a": "2",
+            "b": [2, 4],
+            "vars": {"a": 2},
+            "name": "task2-2"
+        },
+
+    }
+
+
+def test_chunks():
+    data = """
+components: {}
+tasks:
+  - task1:
+      name: task1-${chunks.id}
+      chunks: 2
+"""
+    tasks_data = yaml.safe_load(data)
+    assert taskgraph.load_tasks(tasks_data) == {
+        "task1-1": {
+            "name": "task1-1",
+            "chunks": {
+                "id": 1,
+                "total": 2
+            }
+        },
+        "task1-2": {
+            "name": "task1-2",
+            "chunks": {
+                "id": 2,
+                "total": 2
+            }
+        }
+    }
diff --git a/testing/web-platform/tests/tools/ci/tc/tests/test_valid.py b/testing/web-platform/tests/tools/ci/tc/tests/test_valid.py
new file mode 100644
index 0000000000..6960a2cc47
--- /dev/null
+++ b/testing/web-platform/tests/tools/ci/tc/tests/test_valid.py
@@ -0,0 +1,379 @@
+# mypy: ignore-errors
+
+import json
+import os
+from unittest import mock
+
+import httpx
+import jsone
+import pytest
+import yaml
+from jsonschema import validate
+
+from tools.ci.tc import decision
+
+here = os.path.dirname(__file__)
+root = os.path.abspath(os.path.join(here, "..", "..", "..", ".."))
+
+
+def data_path(filename):
+    return os.path.join(here, "..", "testdata", filename)
+
+
+def test_verify_taskcluster_yml():
+    """Verify that the json-e in the .taskcluster.yml is valid"""
+    with open(os.path.join(root, ".taskcluster.yml"), encoding="utf8") as f:
+        template = yaml.safe_load(f)
+
+    events = [("pr_event.json", "github-pull-request", "Pull Request"),
+              ("master_push_event.json", "github-push", "Push to master")]
+
+    for filename, tasks_for, title in events:
+        with open(data_path(filename), encoding="utf8") as f:
+            event = json.load(f)
+
+        context = {"tasks_for": tasks_for,
+                   "event": event,
+                   "as_slugid": lambda x: x}
+
+        jsone.render(template, context)
+
+
+@pytest.mark.parametrize("event_path,expected",
+                         [("pr_event.json",
+                           frozenset(["lint", "wpt-chrome-dev-stability"])),
+                          ("pr_event_tests_affected.json", frozenset(["lint"]))]
+                         )
+def test_exclude_users(event_path, expected):
+    """Verify that tasks excluded by the PR submitter are properly excluded"""
+    tasks = {
+        "lint": {
+            "commands": "wpt example"
+        },
+        "wpt-chrome-dev-stability": {
+            "commands": "wpt example",
+            "exclude-users": ["chromium-wpt-export-bot"]
+        }
+    }
+    with open(data_path(event_path), encoding="utf8") as f:
+        event = json.load(f)
+        decision.filter_excluded_users(tasks, event)
+        assert set(tasks) == expected
+
+
+def test_sink_task_depends():
+    """Verify that sink task only depends on required tasks"""
+    from tools.ci.tc.decision import decide
+    files_changed = {"layout-instability/clip-negative-bottom-margin.html",
+                     "layout-instability/composited-element-movement.html"}
+    with open(data_path("pr_event_tests_affected.json"), encoding="utf8") as f:
+        event = json.load(f)
+        with mock.patch("tools.ci.tc.decision.get_fetch_rev", return_value=(None, None, None)):
+            with mock.patch("tools.wpt.testfiles.repo_files_changed",
+                            return_value=files_changed):
+                # Ensure we don't exclude the Chrome jobs
+                event["pull_request"]["user"]["login"] = "test"
+                task_id_map = decide(event)
+
+        sink_task = task_id_map["sink-task"][1]
+
+        assert set(sink_task["dependencies"]) == (
+            set(task_id for (task_name, (task_id, _)) in task_id_map.items()
+                if task_name not in {"sink-task", "wpt-chrome-dev-stability"}))
+
+
+def test_verify_payload():
+    """Verify that the decision task produces tasks with a valid payload"""
+    from tools.ci.tc.decision import decide
+
+    r = httpx.get("https://community-tc.services.mozilla.com/schemas/queue/v1/create-task-request.json")
+    r.raise_for_status()
+    create_task_schema = r.json()
+
+    r = httpx.get("https://community-tc.services.mozilla.com/references/schemas/docker-worker/v1/payload.json")
+    r.raise_for_status()
+    payload_schema = r.json()
+
+    jobs = ["lint",
+            "manifest_upload",
+            "resources_unittest",
+            "tools_unittest",
+            "wpt_integration",
+            "wptrunner_infrastructure",
+            "wptrunner_unittest"]
+
+    for filename in ["pr_event.json", "master_push_event.json"]:
+        with open(data_path(filename), encoding="utf8") as f:
+            event = json.load(f)
+
+        with mock.patch("tools.ci.tc.decision.get_fetch_rev", return_value=(None, event["after"], None)):
+            with mock.patch("tools.ci.tc.decision.get_run_jobs", return_value=set(jobs)):
+                task_id_map = decide(event)
+        for name, (task_id, task_data) in task_id_map.items():
+            try:
+                validate(instance=task_data, schema=create_task_schema)
+                validate(instance=task_data["payload"], schema=payload_schema)
+            except Exception as e:
+                print(f"Validation failed for task '{name}':\n{json.dumps(task_data, indent=2)}")
+                raise e
+
+
+@pytest.mark.parametrize("event_path,is_pr,files_changed,expected", [
+    ("master_push_event.json", False, None,
+     ['download-firefox-nightly',
+      'wpt-firefox-nightly-testharness-1',
+      'wpt-firefox-nightly-testharness-2',
+      'wpt-firefox-nightly-testharness-3',
+      'wpt-firefox-nightly-testharness-4',
+      'wpt-firefox-nightly-testharness-5',
+      'wpt-firefox-nightly-testharness-6',
+      'wpt-firefox-nightly-testharness-7',
+      'wpt-firefox-nightly-testharness-8',
+      'wpt-firefox-nightly-testharness-9',
+      'wpt-firefox-nightly-testharness-10',
+      'wpt-firefox-nightly-testharness-11',
+      'wpt-firefox-nightly-testharness-12',
+      'wpt-firefox-nightly-testharness-13',
+      'wpt-firefox-nightly-testharness-14',
+      'wpt-firefox-nightly-testharness-15',
+      'wpt-firefox-nightly-testharness-16',
+      'wpt-chrome-canary-testharness-1',
+      'wpt-chrome-canary-testharness-2',
+      'wpt-chrome-canary-testharness-3',
+      'wpt-chrome-canary-testharness-4',
+      'wpt-chrome-canary-testharness-5',
+      'wpt-chrome-canary-testharness-6',
+      'wpt-chrome-canary-testharness-7',
+      'wpt-chrome-canary-testharness-8',
+      'wpt-chrome-canary-testharness-9',
+      'wpt-chrome-canary-testharness-10',
+      'wpt-chrome-canary-testharness-11',
+      'wpt-chrome-canary-testharness-12',
+      'wpt-chrome-canary-testharness-13',
+      'wpt-chrome-canary-testharness-14',
+      'wpt-chrome-canary-testharness-15',
+      'wpt-chrome-canary-testharness-16',
+      'wpt-chrome-dev-testharness-1',
+      'wpt-chrome-dev-testharness-2',
+      'wpt-chrome-dev-testharness-3',
+      'wpt-chrome-dev-testharness-4',
+      'wpt-chrome-dev-testharness-5',
+      'wpt-chrome-dev-testharness-6',
+      'wpt-chrome-dev-testharness-7',
+      'wpt-chrome-dev-testharness-8',
+      'wpt-chrome-dev-testharness-9',
+      'wpt-chrome-dev-testharness-10',
+      'wpt-chrome-dev-testharness-11',
+      'wpt-chrome-dev-testharness-12',
+      'wpt-chrome-dev-testharness-13',
+      'wpt-chrome-dev-testharness-14',
+      'wpt-chrome-dev-testharness-15',
+      'wpt-chrome-dev-testharness-16',
+      'wpt-firefox-nightly-reftest-1',
+      'wpt-firefox-nightly-reftest-2',
+      'wpt-firefox-nightly-reftest-3',
+      'wpt-firefox-nightly-reftest-4',
+      'wpt-firefox-nightly-reftest-5',
+      'wpt-firefox-nightly-reftest-6',
+      'wpt-chrome-canary-reftest-1',
+      'wpt-chrome-canary-reftest-2',
+      'wpt-chrome-canary-reftest-3',
+      'wpt-chrome-canary-reftest-4',
+      'wpt-chrome-canary-reftest-5',
+      'wpt-chrome-canary-reftest-6',
+      'wpt-chrome-dev-reftest-1',
+      'wpt-chrome-dev-reftest-2',
+      'wpt-chrome-dev-reftest-3',
+      'wpt-chrome-dev-reftest-4',
+      'wpt-chrome-dev-reftest-5',
+      'wpt-chrome-dev-reftest-6',
+      'wpt-firefox-nightly-wdspec-1',
+      'wpt-firefox-nightly-wdspec-2',
+      'wpt-chrome-canary-wdspec-1',
+      'wpt-chrome-canary-wdspec-2',
+      'wpt-chrome-dev-wdspec-1',
+      'wpt-chrome-dev-wdspec-2',
+      'wpt-firefox-nightly-crashtest-1',
+      'wpt-chrome-canary-crashtest-1',
+      'wpt-chrome-dev-crashtest-1',
+      'wpt-firefox-nightly-print-reftest-1',
+      'wpt-chrome-canary-print-reftest-1',
+      'wpt-chrome-dev-print-reftest-1',
+      'lint']),
+    ("pr_event.json", True, {".taskcluster.yml", ".travis.yml", "tools/ci/start.sh"},
+     ['lint',
+      'tools/ unittests (Python 3.7)',
+      'tools/ unittests (Python 3.11)',
+      'tools/ integration tests (Python 3.7)',
+      'tools/ integration tests (Python 3.11)',
+      'resources/ tests (Python 3.7)',
+      'resources/ tests (Python 3.11)',
+      'download-firefox-nightly',
+      'infrastructure/ tests',
+      'sink-task']),
+    # More tests are affected in the actual PR but it shouldn't affect the scheduled tasks
+    ("pr_event_tests_affected.json", True, {"layout-instability/clip-negative-bottom-margin.html",
+                                            "layout-instability/composited-element-movement.html"},
+     ['download-firefox-nightly',
+      'wpt-firefox-nightly-stability',
+      'wpt-firefox-nightly-results',
+      'wpt-firefox-nightly-results-without-changes',
+      'wpt-chrome-dev-results',
+      'wpt-chrome-dev-results-without-changes',
+      'lint',
+      'sink-task']),
+    ("pr_event_tests_affected.json", True, {"resources/testharness.js"},
+     ['lint',
+      'resources/ tests (Python 3.7)',
+      'resources/ tests (Python 3.11)',
+      'download-firefox-nightly',
+      'infrastructure/ tests',
+      'sink-task']),
+    ("epochs_daily_push_event.json", False, None,
+     ['download-firefox-stable',
+      'wpt-firefox-stable-testharness-1',
+      'wpt-firefox-stable-testharness-2',
+      'wpt-firefox-stable-testharness-3',
+      'wpt-firefox-stable-testharness-4',
+      'wpt-firefox-stable-testharness-5',
+      'wpt-firefox-stable-testharness-6',
+      'wpt-firefox-stable-testharness-7',
+      'wpt-firefox-stable-testharness-8',
+      'wpt-firefox-stable-testharness-9',
+      'wpt-firefox-stable-testharness-10',
+      'wpt-firefox-stable-testharness-11',
+      'wpt-firefox-stable-testharness-12',
+      'wpt-firefox-stable-testharness-13',
+      'wpt-firefox-stable-testharness-14',
+      'wpt-firefox-stable-testharness-15',
+      'wpt-firefox-stable-testharness-16',
+      'wpt-chromium-nightly-testharness-1',
+      'wpt-chromium-nightly-testharness-2',
+      'wpt-chromium-nightly-testharness-3',
+      'wpt-chromium-nightly-testharness-4',
+      'wpt-chromium-nightly-testharness-5',
+      'wpt-chromium-nightly-testharness-6',
+      'wpt-chromium-nightly-testharness-7',
+      'wpt-chromium-nightly-testharness-8',
+      'wpt-chromium-nightly-testharness-9',
+      'wpt-chromium-nightly-testharness-10',
+      'wpt-chromium-nightly-testharness-11',
+      'wpt-chromium-nightly-testharness-12',
+      'wpt-chromium-nightly-testharness-13',
+      'wpt-chromium-nightly-testharness-14',
+      'wpt-chromium-nightly-testharness-15',
+      'wpt-chromium-nightly-testharness-16',
+      'wpt-chrome-stable-testharness-1',
+      'wpt-chrome-stable-testharness-2',
+      'wpt-chrome-stable-testharness-3',
+      'wpt-chrome-stable-testharness-4',
+      'wpt-chrome-stable-testharness-5',
+      'wpt-chrome-stable-testharness-6',
+      'wpt-chrome-stable-testharness-7',
+      'wpt-chrome-stable-testharness-8',
+      'wpt-chrome-stable-testharness-9',
+      'wpt-chrome-stable-testharness-10',
+      'wpt-chrome-stable-testharness-11',
+      'wpt-chrome-stable-testharness-12',
+      'wpt-chrome-stable-testharness-13',
+      'wpt-chrome-stable-testharness-14',
+      'wpt-chrome-stable-testharness-15',
+      'wpt-chrome-stable-testharness-16',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-1',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-2',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-3',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-4',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-5',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-6',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-7',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-8',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-9',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-10',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-11',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-12',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-13',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-14',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-15',
+      'wpt-webkitgtk_minibrowser-nightly-testharness-16',
+      'wpt-firefox_android-nightly-testharness-1',
+      'wpt-firefox_android-nightly-testharness-2',
+      'wpt-firefox_android-nightly-testharness-3',
+      'wpt-firefox_android-nightly-testharness-4',
+      'wpt-firefox_android-nightly-testharness-5',
+      'wpt-firefox_android-nightly-testharness-6',
+      'wpt-firefox_android-nightly-testharness-7',
+      'wpt-firefox_android-nightly-testharness-8',
+      'wpt-firefox_android-nightly-testharness-9',
+      'wpt-firefox_android-nightly-testharness-10',
+      'wpt-firefox_android-nightly-testharness-11',
+      'wpt-firefox_android-nightly-testharness-12',
+      'wpt-firefox_android-nightly-testharness-13',
+      'wpt-firefox_android-nightly-testharness-14',
+      'wpt-firefox_android-nightly-testharness-15',
+      'wpt-firefox_android-nightly-testharness-16',
+      'wpt-firefox_android-nightly-testharness-17',
+      'wpt-firefox_android-nightly-testharness-18',
+      'wpt-firefox_android-nightly-testharness-19',
+      'wpt-firefox_android-nightly-testharness-20',
+      'wpt-firefox_android-nightly-testharness-21',
+      'wpt-firefox_android-nightly-testharness-22',
+      'wpt-firefox_android-nightly-testharness-23',
+      'wpt-firefox_android-nightly-testharness-24',
+      'wpt-firefox-stable-reftest-1',
+      'wpt-firefox-stable-reftest-2',
+      'wpt-firefox-stable-reftest-3',
+      'wpt-firefox-stable-reftest-4',
+      'wpt-firefox-stable-reftest-5',
+      'wpt-firefox-stable-reftest-6',
+      'wpt-chromium-nightly-reftest-1',
+      'wpt-chromium-nightly-reftest-2',
+      'wpt-chromium-nightly-reftest-3',
+      'wpt-chromium-nightly-reftest-4',
+      'wpt-chromium-nightly-reftest-5',
+      'wpt-chromium-nightly-reftest-6',
+      'wpt-chrome-stable-reftest-1',
+      'wpt-chrome-stable-reftest-2',
+      'wpt-chrome-stable-reftest-3',
+      'wpt-chrome-stable-reftest-4',
+      'wpt-chrome-stable-reftest-5',
+      'wpt-chrome-stable-reftest-6',
+      'wpt-webkitgtk_minibrowser-nightly-reftest-1',
+      'wpt-webkitgtk_minibrowser-nightly-reftest-2',
+      'wpt-webkitgtk_minibrowser-nightly-reftest-3',
+      'wpt-webkitgtk_minibrowser-nightly-reftest-4',
+      'wpt-webkitgtk_minibrowser-nightly-reftest-5',
+      'wpt-webkitgtk_minibrowser-nightly-reftest-6',
+      'wpt-firefox_android-nightly-reftest-1',
+      'wpt-firefox_android-nightly-reftest-2',
+      'wpt-firefox_android-nightly-reftest-3',
+      'wpt-firefox_android-nightly-reftest-4',
+      'wpt-firefox_android-nightly-reftest-5',
+      'wpt-firefox_android-nightly-reftest-6',
+      'wpt-firefox-stable-wdspec-1',
+      'wpt-firefox-stable-wdspec-2',
+      'wpt-chromium-nightly-wdspec-1',
+      'wpt-chromium-nightly-wdspec-2',
+      'wpt-chrome-stable-wdspec-1',
+      'wpt-chrome-stable-wdspec-2',
+      'wpt-webkitgtk_minibrowser-nightly-wdspec-1',
+      'wpt-webkitgtk_minibrowser-nightly-wdspec-2',
+      'wpt-firefox_android-nightly-wdspec-1',
+      'wpt-firefox_android-nightly-wdspec-2',
+      'wpt-firefox-stable-crashtest-1',
+      'wpt-chromium-nightly-crashtest-1',
+      'wpt-chrome-stable-crashtest-1',
+      'wpt-webkitgtk_minibrowser-nightly-crashtest-1',
+      'wpt-firefox_android-nightly-crashtest-1',
+      'wpt-firefox-stable-print-reftest-1',
+      'wpt-chromium-nightly-print-reftest-1',
+      'wpt-chrome-stable-print-reftest-1'])
+])
+def test_schedule_tasks(event_path, is_pr, files_changed, expected):
+    with mock.patch("tools.ci.tc.decision.get_fetch_rev", return_value=(None, None, None)):
+        with mock.patch("tools.wpt.testfiles.repo_files_changed",
+                        return_value=files_changed):
+            with open(data_path(event_path), encoding="utf8") as event_file:
+                event = json.load(event_file)
+                scheduled = decision.decide(event)
+                print(list(scheduled.keys()))
+                assert list(scheduled.keys()) == expected
-- 
cgit v1.2.3