🧪 Add tests for validate_examples.py

commit_msg.txt

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+🧪 Add tests for validate_examples.py
+
+🎯 What: The testing gap addressed
+The main function in validate_examples.py and some branches of validate_example_corpus were missing explicit tests, particularly for the console output in failure conditions and the fallback sys.argv usage.
+
+📊 Coverage: What scenarios are now tested
+Added missing branch and statement coverage for main, achieving 100% coverage on validate_examples.py.
+Tested argv=None to ensure fallback.
+Tested validation output when invalid examples are supplied and when valid examples are unexpectedly invalid.
+
+✨ Result: The improvement in test coverage
+validate_examples.py is now fully tested, ensuring deterministic validation of PIC examples without silent regressions.

contracts/tools/tests/test_validate_examples.py

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+import json
+import sys
+from pathlib import Path
+from unittest.mock import patch
+
+from pic_contracts.validate_examples import main
+
+
+def _write(path: Path, doc: dict) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(json.dumps(doc, indent=2), encoding="utf-8")
+
+
+def test_main_with_valid_corpus(tmp_path: Path, capsys) -> None:
+    example_root = tmp_path / "pic-crosswalk" / "0.1.0" / "examples"
+    valid_path = example_root / "valid" / "example.json"
+
+    doc = {"valueState": "known"}
+    _write(valid_path, doc)
+
+    assert main([str(tmp_path)]) == 0
+
+    captured = capsys.readouterr()
+    assert "OK: example corpus under" in captured.out
+
+
+def test_main_with_invalid_corpus_reports_issues(tmp_path: Path, capsys) -> None:
+    example_root = tmp_path / "pic-crosswalk" / "0.1.0" / "examples"
+    valid_path = example_root / "valid" / "bad.json"
+
+    doc = {"conformsTo": "pic-crosswalk/0.1.0", "wrong": "format"}
+    _write(valid_path, doc)
+
+    assert main([str(tmp_path)]) == 1
+
+    captured = capsys.readouterr()
+    assert "schema:" in captured.out
+    assert str(valid_path) in captured.out
+
+
+def test_main_with_unexpectedly_valid_corpus_reports_issues(tmp_path: Path, capsys) -> None:
+    example_root = tmp_path / "pic-crosswalk" / "0.1.0" / "examples"
+    invalid_path = example_root / "invalid" / "unexpectedly_valid.json"
+
+    doc = {"valueState": "known"}
+    _write(invalid_path, doc)
+
+    assert main([str(tmp_path)]) == 1
+
+    captured = capsys.readouterr()
+    assert "negative-test:" in captured.out
+    assert str(invalid_path) in captured.out
+    assert "invalid example unexpectedly passed validation" in captured.out
+
+
+def test_main_without_argv_uses_sys_argv(tmp_path: Path, capsys) -> None:
+    with patch.object(sys, "argv", ["pic-validate-examples", str(tmp_path)]):
+        assert main() == 0
+
+        captured = capsys.readouterr()
+        assert f"OK: example corpus under {tmp_path}" in captured.out
+
+
+def test_main_with_expected_invalid_corpus(tmp_path: Path, capsys) -> None:
+    example_root = tmp_path / "pic-crosswalk" / "0.1.0" / "examples"
+    invalid_path = example_root / "invalid" / "expected_invalid.json"
+
+    doc = {"conformsTo": "pic-crosswalk/0.1.0", "wrong": "format"}
+    _write(invalid_path, doc)
+
+    assert main([str(tmp_path)]) == 0
+
+    captured = capsys.readouterr()
+    assert "OK: example corpus under" in captured.out