Add a multi-language mutation tester that writes .metrics/mutate for uml-viewer.

tests/test_runner.py

@@ -0,0 +1,68 @@
+from mutator.runner import _clojure_command, _python_command, nearest
+
+
+def test_nearest_walks_up_to_the_marker(tmp_path):
+    root = tmp_path / "proj"
+    nested = root / "src" / "demo"
+    nested.mkdir(parents=True)
+    (root / "pyproject.toml").write_text("", encoding="utf-8")
+    source = nested / "app.py"
+    source.write_text("x = 1\n", encoding="utf-8")
+    assert nearest(source, "pyproject.toml", root) == root
+    assert nearest(nested, "pyproject.toml", root) == root
+    assert nearest(source, "missing.toml", root) is None
+
+
+def test_clojure_commands(tmp_path):
+    bb = tmp_path / "bb-spec"
+    bb.mkdir()
+    (bb / "bb.edn").write_text('{:tasks {spec "spec"}}', encoding="utf-8")
+    assert _clojure_command(bb) == "bb spec --tag ~no-mutate"
+
+    bb_test = tmp_path / "bb-test"
+    bb_test.mkdir()
+    (bb_test / "bb.edn").write_text("{:tasks {test (clojure \"-M:test\")}}", encoding="utf-8")
+    assert _clojure_command(bb_test) == "bb test"
+
+    spec = tmp_path / "spec"
+    spec.mkdir()
+    (spec / "deps.edn").write_text(
+        "{:aliases {:spec {:extra-deps {speclj/speclj {}}}}}", encoding="utf-8"
+    )
+    assert _clojure_command(spec) == "clj -M:spec --tag ~no-mutate"
+
+    spec_only = tmp_path / "spec-only"
+    spec_only.mkdir()
+    (spec_only / "deps.edn").write_text("{:aliases {:spec {}}}", encoding="utf-8")
+    assert _clojure_command(spec_only) == "clj -M:spec"
+
+    plain = tmp_path / "plain"
+    plain.mkdir()
+    (plain / "deps.edn").write_text("{:deps {}}", encoding="utf-8")
+    assert _clojure_command(plain) == "clj -M:test"
+
+
+def test_python_commands(tmp_path):
+    pytest_dir = tmp_path / "py"
+    pytest_dir.mkdir()
+    (pytest_dir / "pytest.ini").write_text("[pytest]\n", encoding="utf-8")
+    assert _python_command(pytest_dir).endswith("-m pytest")
+
+    unit = tmp_path / "unit"
+    unit.mkdir()
+    assert _python_command(unit).endswith("-m unittest discover")
+
+    cfg = tmp_path / "cfg"
+    cfg.mkdir()
+    (cfg / "setup.cfg").write_text("[tool:pytest]\n", encoding="utf-8")
+    assert _python_command(cfg).endswith("-m pytest")
+
+    project = tmp_path / "proj"
+    project.mkdir()
+    (project / "pyproject.toml").write_text("[project]\ndependencies=['pytest']\n", encoding="utf-8")
+    assert _python_command(project).endswith("-m pytest")
+
+    conf = tmp_path / "conf"
+    conf.mkdir()
+    (conf / "conftest.py").write_text("", encoding="utf-8")
+    assert _python_command(conf).endswith("-m pytest")