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diff --git a/taskcluster/gecko_taskgraph/test/test_morph.py b/taskcluster/gecko_taskgraph/test/test_morph.py
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+++ b/taskcluster/gecko_taskgraph/test/test_morph.py
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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+import pytest
+from mozunit import main
+from taskgraph.graph import Graph
+from taskgraph.parameters import Parameters
+from taskgraph.task import Task
+from taskgraph.taskgraph import TaskGraph
+
+from gecko_taskgraph import morph
+
+
+@pytest.fixture
+def make_taskgraph():
+    def inner(tasks):
+        label_to_taskid = {k: k + "-tid" for k in tasks}
+        for label, task_id in label_to_taskid.items():
+            tasks[label].task_id = task_id
+        graph = Graph(nodes=set(tasks), edges=set())
+        taskgraph = TaskGraph(tasks, graph)
+        return taskgraph, label_to_taskid
+
+    return inner
+
+
+def test_make_index_tasks(make_taskgraph, graph_config):
+    task_def = {
+        "routes": [
+            "index.gecko.v2.mozilla-central.latest.firefox-l10n.linux64-opt.es-MX",
+            "index.gecko.v2.mozilla-central.latest.firefox-l10n.linux64-opt.fy-NL",
+            "index.gecko.v2.mozilla-central.latest.firefox-l10n.linux64-opt.sk",
+            "index.gecko.v2.mozilla-central.latest.firefox-l10n.linux64-opt.sl",
+            "index.gecko.v2.mozilla-central.latest.firefox-l10n.linux64-opt.uk",
+            "index.gecko.v2.mozilla-central.latest.firefox-l10n.linux64-opt.zh-CN",
+            "index.gecko.v2.mozilla-central.pushdate."
+            "2017.04.04.20170404100210.firefox-l10n.linux64-opt.es-MX",
+            "index.gecko.v2.mozilla-central.pushdate."
+            "2017.04.04.20170404100210.firefox-l10n.linux64-opt.fy-NL",
+            "index.gecko.v2.mozilla-central.pushdate."
+            "2017.04.04.20170404100210.firefox-l10n.linux64-opt.sk",
+            "index.gecko.v2.mozilla-central.pushdate."
+            "2017.04.04.20170404100210.firefox-l10n.linux64-opt.sl",
+            "index.gecko.v2.mozilla-central.pushdate."
+            "2017.04.04.20170404100210.firefox-l10n.linux64-opt.uk",
+            "index.gecko.v2.mozilla-central.pushdate."
+            "2017.04.04.20170404100210.firefox-l10n.linux64-opt.zh-CN",
+            "index.gecko.v2.mozilla-central.revision."
+            "b5d8b27a753725c1de41ffae2e338798f3b5cacd.firefox-l10n.linux64-opt.es-MX",
+            "index.gecko.v2.mozilla-central.revision."
+            "b5d8b27a753725c1de41ffae2e338798f3b5cacd.firefox-l10n.linux64-opt.fy-NL",
+            "index.gecko.v2.mozilla-central.revision."
+            "b5d8b27a753725c1de41ffae2e338798f3b5cacd.firefox-l10n.linux64-opt.sk",
+            "index.gecko.v2.mozilla-central.revision."
+            "b5d8b27a753725c1de41ffae2e338798f3b5cacd.firefox-l10n.linux64-opt.sl",
+            "index.gecko.v2.mozilla-central.revision."
+            "b5d8b27a753725c1de41ffae2e338798f3b5cacd.firefox-l10n.linux64-opt.uk",
+            "index.gecko.v2.mozilla-central.revision."
+            "b5d8b27a753725c1de41ffae2e338798f3b5cacd.firefox-l10n.linux64-opt.zh-CN",
+        ],
+        "deadline": "soon",
+        "metadata": {
+            "description": "desc",
+            "owner": "owner@foo.com",
+            "source": "https://source",
+        },
+        "extra": {
+            "index": {"rank": 1540722354},
+        },
+    }
+    task = Task(kind="test", label="a", attributes={}, task=task_def)
+    docker_task = Task(
+        kind="docker-image", label="docker-image-index-task", attributes={}, task={}
+    )
+    taskgraph, label_to_taskid = make_taskgraph(
+        {
+            task.label: task,
+            docker_task.label: docker_task,
+        }
+    )
+
+    index_paths = [
+        r.split(".", 1)[1] for r in task_def["routes"] if r.startswith("index.")
+    ]
+    index_task = morph.make_index_task(
+        task,
+        taskgraph,
+        label_to_taskid,
+        Parameters(strict=False),
+        graph_config,
+        index_paths=index_paths,
+        index_rank=1540722354,
+        purpose="index-task",
+        dependencies={},
+    )
+
+    assert index_task.task["payload"]["command"][0] == "insert-indexes.js"
+    assert index_task.task["payload"]["env"]["TARGET_TASKID"] == "a-tid"
+    assert index_task.task["payload"]["env"]["INDEX_RANK"] == 1540722354
+
+    # check the scope summary
+    assert index_task.task["scopes"] == ["index:insert-task:gecko.v2.mozilla-central.*"]
+
+
+if __name__ == "__main__":
+    main()