Python: add RANDOMKEY command

python/python/tests/test_async_client.py

@@ -6487,24 +6487,45 @@ async def test_lolwut(self, redis_client: TGlideClient):
             result = await redis_client.lolwut(2, [10, 20], RandomNode())
             assert "Redis ver. " in node_result
 
-    @pytest.mark.parametrize("cluster_mode", [True, False])
+    @pytest.mark.parametrize("cluster_mode", [True])
     @pytest.mark.parametrize("protocol", [ProtocolVersion.RESP2, ProtocolVersion.RESP3])
-    async def test_random_key(self, redis_client: TGlideClient):
+    async def test_cluster_client_random_key(self, redis_client: TGlideClient):
         key = get_random_string(10)
 
-        # set a key in the database in case it was empty
+        # setup: delete all keys
+        assert isinstance(redis_client, GlideClusterClient)
+        assert await redis_client.flushall(FlushMode.SYNC)
+
+        # no keys exists, so random_key returns None
+        assert await redis_client.random_key() is None
+
         assert await redis_client.set(key, "foo") == OK
+        # `key` should be the only existing key, so random_key should return `key`
+        assert await redis_client.random_key() == key
+        assert await redis_client.random_key(AllPrimaries()) == key
 
-        result = await redis_client.random_key()
-        assert result is not None
-        assert await redis_client.exists([result]) == 1
+    @pytest.mark.parametrize("cluster_mode", [False])
+    @pytest.mark.parametrize("protocol", [ProtocolVersion.RESP2, ProtocolVersion.RESP3])
+    async def test_standalone_client_random_key(self, redis_client: TGlideClient):
+        key = get_random_string(10)
 
-        if isinstance(redis_client, GlideClusterClient):
-            result = await redis_client.random_key(AllPrimaries())
-            assert result is not None
-            assert await redis_client.exists([result]) == 1
+        assert isinstance(redis_client, GlideClient)
+        # setup: delete all keys in DB 0 and DB 1
+        assert await redis_client.select(0) == OK
+        assert await redis_client.flushdb(FlushMode.SYNC) == OK
+        assert await redis_client.select(1) == OK
+        assert await redis_client.flushdb(FlushMode.SYNC) == OK
 
-        assert await redis_client.flushall(FlushMode.SYNC)
+        # no keys exist so random_key returns None
+        assert await redis_client.random_key() is None
+        # set `key` in DB 1
+        assert await redis_client.set(key, "foo") == OK
+        # `key` should be the only key in the database
+        assert await redis_client.random_key() == key
+
+        # switch back to DB 0
+        assert await redis_client.select(0) == OK
+        # DB 0 should still have no keys, so random_key should still return None
         assert await redis_client.random_key() is None