Improve test coverage

Author: mr-c

tests/test_numeric_id.py

@@ -0,0 +1,15 @@
+from os import linesep as n
+
+from .util import get_data, run_with_mock_cwl_runner
+
+
+def test_include_by_number() -> None:
+    args = [
+        "--test",
+        get_data("tests/test-data/exclude-tags.yml"),
+        "-n1",
+    ]
+    error_code, stdout, stderr = run_with_mock_cwl_runner(args)
+    assert f"[1/3] opt-error1: Test with label{n}" in stderr
+    assert "opt-error2" not in stderr
+    assert "opt-error3" not in stderr