Add tests for unix socket with relative path

Signed-off-by: Salvatore Mesoraca <[email protected]>

tests/test_connection.py

@@ -341,3 +341,9 @@ def test_unix_socket_connection_failure():
         str(e.value)
         == "Error 2 connecting to unix:///tmp/a.sock. No such file or directory."
     )
+
+def test_parsing_unix_socket_relative_path():
+    parsed = parse_url("unix:./valkey.sock", False)
+    assert parsed['path'] == './valkey.sock'
+    assert parsed['connection_class'] is UnixDomainSocketConnection
+    assert len(parsed) == 2