diff --git a/posthog/models/feature_flag/test/test_flag_matching.py b/posthog/models/feature_flag/test/test_flag_matching.py
new file mode 100644
index 00000000000..de1be6a0666
--- /dev/null
+++ b/posthog/models/feature_flag/test/test_flag_matching.py
@@ -0,0 +1,31 @@
+from posthog.models.feature_flag.feature_flag import FeatureFlag
+from posthog.models.feature_flag.flag_matching import FeatureFlagMatcher
+from posthog.test.base import BaseTest
+
+
+class TestFlagMatching(BaseTest):
+    def test_get_hash(self):
+        # Create test flag
+        flag = FeatureFlag(key="test-flag", rollout_percentage=50, team=self.team)
+
+        # Test with different identifiers
+        matcher1 = FeatureFlagMatcher([flag], "distinct_id_1")
+        matcher2 = FeatureFlagMatcher([flag], "distinct_id_2")
+
+        # Same identifier should get same hash
+        # distinct_id_1 + test-flag = 0.35140843114131903
+        self.assertAlmostEqual(matcher1.get_hash(flag), 0.35140843114131903)
+        self.assertAlmostEqual(matcher1.get_hash(flag), 0.35140843114131903)
+
+        # Different identifiers should get different hashes
+        # distinct_id_2 + test-flag = 0.34900843133051557
+        self.assertAlmostEqual(matcher2.get_hash(flag), 0.34900843133051557)
+
+        # Different salt should produce different hash
+        # distinct_id_1 + test-flag + salt = 0.05659409091269017
+        self.assertAlmostEqual(matcher1.get_hash(flag, salt="salt"), 0.05659409091269017)
+
+        # Different flag keys should produce different hashes
+        flag2 = FeatureFlag(key="different-flag", rollout_percentage=50, team=self.team)
+        # distinct_id_1 + different-flag = 0.5078604702829128
+        self.assertAlmostEqual(matcher1.get_hash(flag2), 0.5078604702829128)