DEVX-7: fix: make all warnings into errors across devx tools

tests/unit/test_molecule_ci_guard.py

@@ -168,6 +168,15 @@ class TestCli:
             assert result.exit_code == 0
             assert "All molecule tests passed" in result.output
 
+    def test_invalid_pair_format_raises(self) -> None:
+        """Pair with fewer than 2 parts should raise."""
+        from click.testing import CliRunner
+
+        runner = CliRunner()
+        result = runner.invoke(cli, ["invalid_no_pipe"])
+        assert result.exit_code != 0
+        assert "Invalid pair format" in result.output
+
     def test_failure_exits_nonzero(self) -> None:
         from click.testing import CliRunner