test(ecosystems): add tests for ecosystem consistency (#2615)

Test that ecosystem name hardcoding is internally consistent and
consistent with the OSV Schema

Requires OSV Schema submodule to be at or past
ossf/osv-schema@84969b4
(currently unreleased) to pass.

osv/ecosystems/ecosystems_test.py

@@ -0,0 +1,58 @@
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Ecosystem helpers tests."""
+
+import json
+
+import re
+
+import unittest
+
+from . import _ecosystems
+
+
+class EcosystemsTest(unittest.TestCase):
+  """Ecosystem helpers tests."""
+
+  def setUp(self):
+    with open('osv/osv-schema/validation/schema.json') as schema_f:
+      schema = json.load(schema_f)
+    self.schema_ecosystems = re.compile(schema['$defs']['ecosystem']['pattern'])
+    self.canonical_ecosystems = _ecosystems._ecosystems.keys()  # pylint: disable=protected-access
+
+  def test_ecosystem_supported_by_schema(self):
+    """Test ecosystems referenced exist in schema definition"""
+    for ecosystem in self.canonical_ecosystems:
+      self.assertIsNotNone(
+          self.schema_ecosystems.match(ecosystem),
+          msg=f'"{ecosystem}" not defined in schema')
+
+    for ecosystem in _ecosystems.SEMVER_ECOSYSTEMS:
+      self.assertIsNotNone(
+          self.schema_ecosystems.match(ecosystem),
+          msg=f'SEMVER ecosystem "{ecosystem}" not defined in schema')
+
+    for ecosystem in _ecosystems.package_urls:
+      self.assertIsNotNone(
+          self.schema_ecosystems.match(ecosystem),
+          msg=f'Purl "{ecosystem}" not defined in schema')
+
+    for ecosystem in _ecosystems._OSV_TO_DEPS_ECOSYSTEMS_MAP:  # pylint: disable=protected-access
+      self.assertIsNotNone(
+          self.schema_ecosystems.match(ecosystem),
+          msg=f'"{ecosystem}" in deps.dev map not defined in schema')
+
+
+if __name__ == '__main__':
+  unittest.main()