mirror of
https://github.com/unclebob/mutator.git
synced 2026-11-06 18:23:50 +00:00
Robert C. Martin
ba4065f3f1
A package path is one argument. Git status uses NUL records and returns git's status. A failed coverage command leaves reports unread, coverage keeps the longest path match, and site walks no longer recurse.
122 lines
4.1 KiB
Python
122 lines
4.1 KiB
Python
import subprocess
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import sys
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from mutator.cli import parse_args, run
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from mutator.runner import CommandResult
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def test_lines_option_parses_positive_numbers():
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options = parse_args(["--lines", "2, 4", "src/demo.py"])
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assert options.lines == {2, 4}
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def test_changed_selects_a_dirty_source_file(tmp_path, monkeypatch, capsys):
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path = tmp_path / "src" / "demo.py"
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path.parent.mkdir()
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path.write_text("def place(x):\n return x > 0\n", encoding="utf-8")
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subprocess.run(["git", "init"], cwd=tmp_path, check=True, capture_output=True)
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subprocess.run(["git", "add", "src/demo.py"], cwd=tmp_path, check=True, capture_output=True)
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monkeypatch.chdir(tmp_path)
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code = run(["--scan", "--no-coverage", "--changed", "--root", str(tmp_path)])
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captured = capsys.readouterr()
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assert code == 0
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assert "demo.py:2" in captured.out
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def test_a_directory_argument_skips_a_named_test_file(tmp_path, capsys):
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src = tmp_path / "pkg" / "app.py"
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src.parent.mkdir()
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src.write_text("def place(x):\n return x > 0\n", encoding="utf-8")
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test = tmp_path / "pkg" / "test_app.py"
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test.write_text("def test_place():\n assert True\n", encoding="utf-8")
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code = run(
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["--scan", "--no-coverage", "--root", str(tmp_path), str(tmp_path / "pkg"), str(test)]
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)
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captured = capsys.readouterr()
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assert code == 0
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assert "Skipping test file" in captured.err
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assert "app.py:2" in captured.out
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def test_help_and_conflicting_flags():
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help_options = parse_args(["--help"])
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assert help_options.exit_code == 0
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assert "uml-viewer" in help_options.message
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assert "__pycache__" in help_options.message
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assert "testdata" in help_options.message
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conflict = parse_args(["--mutate-all", "--since-last-run", "src/demo.py"])
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assert conflict.exit_code == 1
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assert run(["--help"]) == 0
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def test_scan_lists_sites_without_writing_metrics(tmp_path, monkeypatch):
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path = tmp_path / "src" / "demo.py"
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path.parent.mkdir()
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path.write_text("def place(x):\n return x > 0\n", encoding="utf-8")
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monkeypatch.chdir(tmp_path)
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code = run(["--scan", "--no-coverage", "--root", str(tmp_path), "src/demo.py"])
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assert code == 0
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assert not (tmp_path / ".metrics").exists()
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def test_real_python_mutants_update_the_snapshot(tmp_path, capsys):
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path = tmp_path / "src" / "demo.py"
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path.parent.mkdir()
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path.write_text(
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"def add(a, b):\n"
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" if a > 0:\n"
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" return a + b\n"
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" return 0\n",
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encoding="utf-8",
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)
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command = (
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f"{sys.executable} -c \"import sys; sys.path.insert(0, 'src'); "
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"from demo import add; raise SystemExit(0 if add(2, 3) == 5 else 1)\""
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)
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code = run(
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[
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"--no-coverage",
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"--mutate-all",
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"--root",
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str(tmp_path),
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"--test-command",
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command,
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"src/demo.py",
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]
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)
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captured = capsys.readouterr()
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assert code == 3
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assert "SURVIVED" in captured.out
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assert "KILLED" in captured.out
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snapshot = tmp_path / ".metrics" / "mutate" / "demo.edn"
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assert snapshot.is_file()
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text = snapshot.read_text(encoding="utf-8")
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assert ":namespace \"demo\"" in text
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assert ":id \"defn/add\"" in text
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assert path.read_text(encoding="utf-8").startswith("def add")
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def test_a_failed_coverage_command_does_not_read_the_report(tmp_path, capsys):
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path = tmp_path / "src" / "app.py"
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path.parent.mkdir()
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path.write_text("def place(x):\n return x > 0\n", encoding="utf-8")
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report = tmp_path / "target" / "coverage" / "python" / "lcov.info"
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report.parent.mkdir(parents=True)
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report.write_text("SF:src/app.py\nDA:1,1\nDA:2,1\nend_of_record\n", encoding="utf-8")
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code = run(
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[
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"--root",
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str(tmp_path),
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"--coverage-command",
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"exit 3",
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"--test-command",
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"false",
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"src/app.py",
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]
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)
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captured = capsys.readouterr()
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assert code == 3
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assert "will not be read" in captured.err
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assert "Baseline failed" not in captured.err
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assert path.read_text(encoding="utf-8").startswith("def place")
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