1 files changed, 70 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/tests/python/test_usecounters.py b/toolkit/components/telemetry/tests/python/test_usecounters.py
new file mode 100644
index 0000000000..643bba27d7
--- /dev/null
+++ b/toolkit/components/telemetry/tests/python/test_usecounters.py
@@ -0,0 +1,70 @@
+# 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 sys
+import unittest
+from os import path
+
+import mozunit
+from test_histogramtools_non_strict import load_histogram
+
+TELEMETRY_ROOT_PATH = path.abspath(
+    path.join(path.dirname(__file__), path.pardir, path.pardir)
+)
+sys.path.append(TELEMETRY_ROOT_PATH)
+# The parsers live in a subdirectory of "build_scripts", account for that.
+# NOTE: if the parsers are moved, this logic will need to be updated.
+sys.path.append(path.join(TELEMETRY_ROOT_PATH, "build_scripts"))
+from mozparsers import parse_histograms
+from mozparsers.shared_telemetry_utils import ParserError
+
+
+class TestParser(unittest.TestCase):
+    def test_usecounter_collection_enabled(self):
+        SAMPLE_HISTOGRAM = {
+            "USE_COUNTER2_TEST_HISTOGRAM": {
+                "expires_in_version": "never",
+                "kind": "boolean",
+                "description": "Whether a foo used bar",
+            }
+        }
+        histograms = load_histogram(SAMPLE_HISTOGRAM)
+        parse_histograms.load_allowlist()
+
+        hist = parse_histograms.Histogram(
+            "USE_COUNTER2_TEST_HISTOGRAM",
+            histograms["USE_COUNTER2_TEST_HISTOGRAM"],
+            strict_type_checks=True,
+        )
+
+        ParserError.exit_func()
+        self.assertEqual(hist.dataset(), "nsITelemetry::DATASET_ALL_CHANNELS")
+        self.assertEqual(hist.products(), ["firefox", "fennec"])
+
+    def test_usecounter_histogram(self):
+        SAMPLE_HISTOGRAM = {
+            "USE_COUNTER2_TEST_HISTOGRAM": {
+                "expires_in_version": "never",
+                "kind": "boolean",
+                "description": "Whether a foo used bar",
+            }
+        }
+        histograms = load_histogram(SAMPLE_HISTOGRAM)
+        parse_histograms.load_allowlist()
+
+        hist = parse_histograms.Histogram(
+            "USE_COUNTER2_TEST_HISTOGRAM",
+            histograms["USE_COUNTER2_TEST_HISTOGRAM"],
+            strict_type_checks=True,
+        )
+
+        ParserError.exit_func()
+        self.assertEqual(hist.expiration(), "never")
+        self.assertEqual(hist.kind(), "boolean")
+        self.assertEqual(hist.description(), "Whether a foo used bar")
+        self.assertEqual(hist.products(), ["firefox", "fennec"])
+
+
+if __name__ == "__main__":
+    mozunit.main()