Update packages/google-api-core/tests/unit/test_path_template.py

Co-authored-by: Chalmer Lowe <chalmerlowe@google.com>

Author: daniel-sanche

packages/google-api-core/tests/unit/test_path_template.py

@@ -845,6 +845,11 @@ def test_build_capture_pattern(template_str, expected_pattern, expected_wildcard
         ("a/b/../../..", False),
         (".", False),
         ("..", False),
+        ("", False),
+        ("/", False),
+        ("//", False),
+        ("a/../../b", False),
+        ("../..", False),
         ("instance//..", False),
         ("instance/my-instance///../..", False),
     ],