diff --git a/tests/test_update.py b/tests/test_update.py
index 466d2bc..5f689be 100644
--- a/tests/test_update.py
+++ b/tests/test_update.py
@@ -14,6 +14,14 @@ def get_env_dirs(name: str):  # noqa: D103
     return {"argvalues": paths, "ids": [f"{p.parent.name}/{p.name}" for p in paths]}
 
 
+def test_invalid_args(cmd, tmp_path: Path):
+    """Run test case on env having valid files, but command argument is invalid."""
+    env_path = next((root / "return-0").glob("*"))
+    shutil.copytree(env_path, tmp_path, dirs_exist_ok=True)
+    proc: CompletedProcess = cmd("update", "-1")
+    assert proc.returncode != 0
+
+
 @pytest.mark.parametrize(
     "env_path",
     **get_env_dirs("return-1"),