1 files changed, 35 insertions, 0 deletions
diff --git a/examples/redis-unstable/modules/vector-sets/tests/vrand-ping-pong.py b/examples/redis-unstable/modules/vector-sets/tests/vrand-ping-pong.py
new file mode 100644
index 0000000..99d2e9a
--- /dev/null
+++ b/examples/redis-unstable/modules/vector-sets/tests/vrand-ping-pong.py
@@ -0,0 +1,35 @@
+from test import TestCase, generate_random_vector
+import struct
+
+class VRANDMEMBERPingPongRegressionTest(TestCase):
+    def getname(self):
+        return "[regression] VRANDMEMBER ping-pong"
+
+    def test(self):
+        """
+        This test ensures that when only two vectors exist, VRANDMEMBER
+        does not get stuck returning only one of them due to the "ping-pong" issue.
+        """
+        self.redis.delete(self.test_key) # Clean up before test
+        dim = 4
+
+        # Add exactly two vectors
+        vec1_name = "vec1"
+        vec1_data = generate_random_vector(dim)
+        self.redis.execute_command('VADD', self.test_key, 'VALUES', dim, *vec1_data, vec1_name)
+
+        vec2_name = "vec2"
+        vec2_data = generate_random_vector(dim)
+        self.redis.execute_command('VADD', self.test_key, 'VALUES', dim, *vec2_data, vec2_name)
+
+        # Call VRANDMEMBER many times and check for distribution
+        iterations = 100
+        results = []
+        for _ in range(iterations):
+            member = self.redis.execute_command('VRANDMEMBER', self.test_key)
+            results.append(member.decode())
+
+        # Verify that both members were returned, proving it's not stuck
+        unique_results = set(results)
+
+        assert len(unique_results) == 2, f"Ping-pong test failed: should have returned 2 unique members, but got {len(unique_results)}."