1 files changed, 90 insertions, 0 deletions
diff --git a/taskcluster/gecko_taskgraph/test/test_files_changed.py b/taskcluster/gecko_taskgraph/test/test_files_changed.py
new file mode 100644
index 0000000000..5b9a016649
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/test/test_files_changed.py
@@ -0,0 +1,90 @@
+# 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 json
+import os
+import unittest
+
+from mozunit import main
+
+from gecko_taskgraph import files_changed
+from gecko_taskgraph.util import hg
+
+PARAMS = {
+    "head_repository": "https://hg.mozilla.org/mozilla-central",
+    "head_rev": "a14f88a9af7a",
+}
+
+FILES_CHANGED = [
+    "devtools/client/debugger/index.html",
+    "devtools/client/inspector/test/browser_inspector_highlighter-eyedropper-events.js",
+    "devtools/client/inspector/test/head.js",
+    "devtools/client/themes/rules.css",
+    "devtools/client/webconsole/test/browser_webconsole_output_06.js",
+    "devtools/server/actors/highlighters/eye-dropper.js",
+    "devtools/server/actors/object.js",
+    "docshell/base/nsDocShell.cpp",
+    "dom/tests/mochitest/general/test_contentViewer_overrideDPPX.html",
+    "taskcluster/scripts/builder/build-l10n.sh",
+]
+
+
+class FakeResponse:
+    def json(self):
+        with open(
+            os.path.join(os.path.dirname(__file__), "automationrelevance.json")
+        ) as f:
+            return json.load(f)
+
+
+class TestGetChangedFiles(unittest.TestCase):
+    def setUp(self):
+        files_changed.get_changed_files.clear()
+        self.old_get = hg.requests.get
+
+        def fake_get(url, **kwargs):
+            return FakeResponse()
+
+        hg.requests.get = fake_get
+
+    def tearDown(self):
+        hg.requests.get = self.old_get
+        files_changed.get_changed_files.clear()
+
+    def test_get_changed_files(self):
+        """Get_changed_files correctly gets the list of changed files in a push.
+        This tests against the production hg.mozilla.org so that it will detect
+        any changes in the format of the returned data."""
+        self.assertEqual(
+            sorted(
+                files_changed.get_changed_files(
+                    PARAMS["head_repository"], PARAMS["head_rev"]
+                )
+            ),
+            FILES_CHANGED,
+        )
+
+
+class TestCheck(unittest.TestCase):
+    def setUp(self):
+        files_changed.get_changed_files[
+            PARAMS["head_repository"], PARAMS["head_rev"]
+        ] = FILES_CHANGED
+
+    def tearDown(self):
+        files_changed.get_changed_files.clear()
+
+    def test_check_no_params(self):
+        self.assertTrue(files_changed.check({}, ["ignored"]))
+
+    def test_check_no_match(self):
+        self.assertFalse(files_changed.check(PARAMS, ["nosuch/**"]))
+
+    def test_check_match(self):
+        self.assertTrue(files_changed.check(PARAMS, ["devtools/**"]))
+
+
+if __name__ == "__main__":
+    main()