1 files changed, 114 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/tests/python/test_histogramtools_non_strict.py b/toolkit/components/telemetry/tests/python/test_histogramtools_non_strict.py
new file mode 100644
index 0000000000..6c8a3ed62d
--- /dev/null
+++ b/toolkit/components/telemetry/tests/python/test_histogramtools_non_strict.py
@@ -0,0 +1,114 @@
+# 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 sys
+import unittest
+from os import path
+
+import mozunit
+
+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  # noqa: E402
+
+
+def load_histogram(histograms):
+    """Parse the passed Histogram and return a dictionary mapping histogram
+    names to histogram parameters.
+
+    :param histogram: Histogram as a python dictionary
+    :returns: Parsed Histogram dictionary mapping histogram names to histogram parameters
+    """
+
+    def hook(ps):
+        return parse_histograms.load_histograms_into_dict(ps, strict_type_checks=False)
+
+    return json.loads(json.dumps(histograms), object_pairs_hook=hook)
+
+
+class TestParser(unittest.TestCase):
+    def test_unknown_field(self):
+        SAMPLE_HISTOGRAM = {
+            "A11Y_INSTANTIATED_FLAG": {
+                "record_in_processes": ["main", "content"],
+                "expires_in_version": "never",
+                "kind": "flag",
+                "description": "has accessibility support been instantiated",
+                "new_field": "Its a new field",
+            }
+        }
+        histograms = load_histogram(SAMPLE_HISTOGRAM)
+
+        hist = parse_histograms.Histogram(
+            "A11Y_INSTANTIATED_FLAG",
+            histograms["A11Y_INSTANTIATED_FLAG"],
+            strict_type_checks=False,
+        )
+        self.assertEqual(hist.expiration(), "never")
+        self.assertEqual(hist.kind(), "flag")
+        self.assertEqual(hist.record_in_processes(), ["main", "content"])
+
+    def test_non_numeric_expressions(self):
+        SAMPLE_HISTOGRAM = {
+            "TEST_NON_NUMERIC_HISTOGRAM": {
+                "kind": "linear",
+                "description": "sample",
+                "n_buckets": "JS::GCReason::NUM_TELEMETRY_REASONS",
+                "high": "mozilla::StartupTimeline::MAX_EVENT_ID",
+            }
+        }
+
+        histograms = load_histogram(SAMPLE_HISTOGRAM)
+        hist = parse_histograms.Histogram(
+            "TEST_NON_NUMERIC_HISTOGRAM",
+            histograms["TEST_NON_NUMERIC_HISTOGRAM"],
+            strict_type_checks=False,
+        )
+
+        # expected values come off parse_histograms.py
+        self.assertEqual(hist.n_buckets(), 101)
+        self.assertEqual(hist.high(), 12)
+
+    def test_current_histogram(self):
+        HISTOGRAMS_PATH = path.join(TELEMETRY_ROOT_PATH, "Histograms.json")
+        all_histograms = list(
+            parse_histograms.from_files([HISTOGRAMS_PATH], strict_type_checks=False)
+        )
+        test_histogram = [
+            i for i in all_histograms if i.name() == "TELEMETRY_TEST_FLAG"
+        ][0]
+
+        self.assertEqual(test_histogram.expiration(), "never")
+        self.assertEqual(test_histogram.kind(), "flag")
+        self.assertEqual(test_histogram.record_in_processes(), ["main", "content"])
+        self.assertEqual(test_histogram.keyed(), False)
+
+    def test_no_products(self):
+        SAMPLE_HISTOGRAM = {
+            "TEST_EMPTY_PRODUCTS": {
+                "kind": "flag",
+                "description": "sample",
+            }
+        }
+
+        histograms = load_histogram(SAMPLE_HISTOGRAM)
+        hist = parse_histograms.Histogram(
+            "TEST_EMPTY_PRODUCTS",
+            histograms["TEST_EMPTY_PRODUCTS"],
+            strict_type_checks=False,
+        )
+
+        self.assertEqual(hist.kind(), "flag")
+        # bug 1486072: absent `product` key becomes None instead of ["all"]
+        self.assertEqual(hist.products(), None)
+
+
+if __name__ == "__main__":
+    mozunit.main()