1 files changed, 91 insertions, 0 deletions
diff --git a/test/conftest.py b/test/conftest.py
new file mode 100644
index 0000000..8ffa3bd
--- /dev/null
+++ b/test/conftest.py
@@ -0,0 +1,91 @@
+"""PyTest fixtures for testing the project."""
+from __future__ import annotations
+
+import shutil
+import subprocess
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+import pytest
+
+# pylint: disable=wildcard-import,unused-wildcard-import
+from ansiblelint.testing.fixtures import *  # noqa: F403
+from ansiblelint.yaml_utils import FormattedYAML
+
+if TYPE_CHECKING:
+    from _pytest import nodes
+    from _pytest.config import Config
+    from _pytest.config.argparsing import Parser
+
+
+def pytest_addoption(parser: Parser) -> None:
+    """Add --regenerate-formatting-fixtures option to pytest."""
+    parser.addoption(
+        "--regenerate-formatting-fixtures",
+        action="store_true",
+        default=False,
+        help="Regenerate formatting fixtures with prettier and internal formatter",
+    )
+
+
+def pytest_collection_modifyitems(items: list[nodes.Item], config: Config) -> None:
+    """Skip tests based on --regenerate-formatting-fixtures option."""
+    do_regenerate = config.getoption("--regenerate-formatting-fixtures")
+    skip_other = pytest.mark.skip(
+        reason="not a formatting_fixture test and "
+        "--regenerate-formatting-fixtures was specified",
+    )
+    skip_formatting_fixture = pytest.mark.skip(
+        reason="specify --regenerate-formatting-fixtures to "
+        "only run formatting_fixtures test",
+    )
+    for item in items:
+        if do_regenerate and "formatting_fixtures" not in item.keywords:
+            item.add_marker(skip_other)
+        elif not do_regenerate and "formatting_fixtures" in item.keywords:
+            item.add_marker(skip_formatting_fixture)
+
+
+def pytest_configure(config: Config) -> None:
+    """Register custom markers."""
+    if config.getoption("--regenerate-formatting-fixtures"):
+        regenerate_formatting_fixtures()
+
+
+def regenerate_formatting_fixtures() -> None:
+    """Re-generate formatting fixtures with prettier and internal formatter.
+
+    Pass ``--regenerate-formatting-fixtures`` to run this and skip all other tests.
+    This is a "test" because once fixtures are regenerated,
+    we run prettier again to make sure it does not change files formatted
+    with our internal formatting code.
+    """
+    subprocess.check_call(["which", "prettier"])
+
+    yaml = FormattedYAML()
+
+    fixtures_dir = Path("test/fixtures/")
+    fixtures_dir_before = fixtures_dir / "formatting-before"
+    fixtures_dir_prettier = fixtures_dir / "formatting-prettier"
+    fixtures_dir_after = fixtures_dir / "formatting-after"
+
+    fixtures_dir_prettier.mkdir(exist_ok=True)
+    fixtures_dir_after.mkdir(exist_ok=True)
+
+    # Copying before fixtures...
+    for fixture in fixtures_dir_before.glob("fmt-[0-9].yml"):
+        shutil.copy(str(fixture), str(fixtures_dir_prettier / fixture.name))
+        shutil.copy(str(fixture), str(fixtures_dir_after / fixture.name))
+
+    # Writing fixtures with prettier...
+    subprocess.check_call(["prettier", "-w", str(fixtures_dir_prettier)])
+    # NB: pre-commit end-of-file-fixer can also modify files.
+
+    # Writing fixtures with ansiblelint.yaml_utils.FormattedYAML()
+    for fixture in fixtures_dir_after.glob("fmt-[0-9].yml"):
+        data = yaml.loads(fixture.read_text())
+        output = yaml.dumps(data)
+        fixture.write_text(output)
+
+    # Make sure prettier won't make changes in {fixtures_dir_after}
+    subprocess.check_call(["prettier", "-c", str(fixtures_dir_after)])