Document some culprits with pre-commit (#1783)

[etc/vim.git] / tests / test_black.py

diff --git a/tests/test_black.py b/tests/test_black.py
index 629afc5b0ad2c86fc340f4921bd5f24b3ba112da..7927b368b5d0fc7d7141875db1933175b261b240 100644 (file)
--- a/tests/test_black.py
+++ b/tests/test_black.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python3
 #!/usr/bin/env python3

+import multiprocessing

 import asyncio
 import logging
 from concurrent.futures import ThreadPoolExecutor
 import asyncio
 import logging
 from concurrent.futures import ThreadPoolExecutor


@@ -9,6 +10,7 @@ import inspect
 from io import BytesIO, TextIOWrapper
 import os
 from pathlib import Path
 from io import BytesIO, TextIOWrapper
 import os
 from pathlib import Path

+from platform import system

 import regex as re
 import sys
 from tempfile import TemporaryDirectory
 import regex as re
 import sys
 from tempfile import TemporaryDirectory


@@ -20,7 +22,6 @@ from typing import (
     Dict,
     Generator,
     List,
     Dict,
     Generator,
     List,

-    Tuple,

     Iterator,
     TypeVar,
 )
     Iterator,
     TypeVar,
 )


@@ -34,18 +35,10 @@ from click.testing import CliRunner
 import black
 from black import Feature, TargetVersion
 
 import black
 from black import Feature, TargetVersion
 

-try:
-    import blackd
-    from aiohttp.test_utils import AioHTTPTestCase, unittest_run_loop
-    from aiohttp import web
-except ImportError:
-    has_blackd_deps = False
-else:
-    has_blackd_deps = True
-

 from pathspec import PathSpec
 
 # Import other test classes
 from pathspec import PathSpec
 
 # Import other test classes

+from tests.util import THIS_DIR, read_data, DETERMINISTIC_HEADER

 from .test_primer import PrimerCLITests  # noqa: F401
 
 
 from .test_primer import PrimerCLITests  # noqa: F401
 
 


@@ -53,13 +46,13 @@ DEFAULT_MODE = black.FileMode(experimental_string_processing=True)
 ff = partial(black.format_file_in_place, mode=DEFAULT_MODE, fast=True)
 fs = partial(black.format_str, mode=DEFAULT_MODE)
 THIS_FILE = Path(__file__)
 ff = partial(black.format_file_in_place, mode=DEFAULT_MODE, fast=True)
 fs = partial(black.format_str, mode=DEFAULT_MODE)
 THIS_FILE = Path(__file__)

-THIS_DIR = THIS_FILE.parent
-PROJECT_ROOT = THIS_DIR.parent
-DETERMINISTIC_HEADER = "[Deterministic header]"
-EMPTY_LINE = "# EMPTY LINE WITH WHITESPACE" + " (this comment will be removed)"
-PY36_ARGS = [
-    f"--target-version={version.name.lower()}" for version in black.PY36_VERSIONS
-]
+PY36_VERSIONS = {
+    TargetVersion.PY36,
+    TargetVersion.PY37,
+    TargetVersion.PY38,
+    TargetVersion.PY39,
+}
+PY36_ARGS = [f"--target-version={version.name.lower()}" for version in PY36_VERSIONS]

 T = TypeVar("T")
 R = TypeVar("R")
 
 T = TypeVar("T")
 R = TypeVar("R")
 


@@ -68,29 +61,6 @@ def dump_to_stderr(*output: str) -> str:
     return "\n" + "\n".join(output) + "\n"
 
 
     return "\n" + "\n".join(output) + "\n"
 
 

-def read_data(name: str, data: bool = True) -> Tuple[str, str]:
-    """read_data('test_name') -> 'input', 'output'"""
-    if not name.endswith((".py", ".pyi", ".out", ".diff")):
-        name += ".py"
-    _input: List[str] = []
-    _output: List[str] = []
-    base_dir = THIS_DIR / "data" if data else PROJECT_ROOT
-    with open(base_dir / name, "r", encoding="utf8") as test:
-        lines = test.readlines()
-    result = _input
-    for line in lines:
-        line = line.replace(EMPTY_LINE, "")
-        if line.rstrip() == "# output":
-            result = _output
-            continue
-
-        result.append(line)
-    if _input and not _output:
-        # If there's no output marker, treat the entire file as already pre-formatted.
-        _output = _input[:]
-    return "".join(_input).strip() + "\n", "".join(_output).strip() + "\n"
-
-

 @contextmanager
 def cache_dir(exists: bool = True) -> Iterator[Path]:
     with TemporaryDirectory() as workspace:
 @contextmanager
 def cache_dir(exists: bool = True) -> Iterator[Path]:
     with TemporaryDirectory() as workspace:


@@ -113,17 +83,6 @@ def event_loop() -> Iterator[None]:
         loop.close()
 
 
         loop.close()
 
 

-@contextmanager
-def skip_if_exception(e: str) -> Iterator[None]:
-    try:
-        yield
-    except Exception as exc:
-        if exc.__class__.__name__ == e:
-            unittest.skip(f"Encountered expected exception {exc}, skipping")
-        else:
-            raise
-
-

 class FakeContext(click.Context):
     """A fake click Context for when calling functions that need it."""
 
 class FakeContext(click.Context):
     """A fake click Context for when calling functions that need it."""
 


@@ -233,9 +192,12 @@ class BlackTestCase(unittest.TestCase):
             os.unlink(tmp_file)
         self.assertFormatEqual(expected, actual)
 
             os.unlink(tmp_file)
         self.assertFormatEqual(expected, actual)
 

-    def test_self(self) -> None:
+    def test_run_on_test_black(self) -> None:

         self.checkSourceFile("tests/test_black.py")
 
         self.checkSourceFile("tests/test_black.py")
 

+    def test_run_on_test_blackd(self) -> None:
+        self.checkSourceFile("tests/test_blackd.py")
+

     def test_black(self) -> None:
         self.checkSourceFile("src/black/__init__.py")
 
     def test_black(self) -> None:
         self.checkSourceFile("src/black/__init__.py")
 


@@ -703,7 +665,7 @@ class BlackTestCase(unittest.TestCase):
     @patch("black.dump_to_file", dump_to_stderr)
     def test_numeric_literals(self) -> None:
         source, expected = read_data("numeric_literals")
     @patch("black.dump_to_file", dump_to_stderr)
     def test_numeric_literals(self) -> None:
         source, expected = read_data("numeric_literals")

-        mode = replace(DEFAULT_MODE, target_versions=black.PY36_VERSIONS)
+        mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)

         actual = fs(source, mode=mode)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
         actual = fs(source, mode=mode)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)


@@ -712,7 +674,7 @@ class BlackTestCase(unittest.TestCase):
     @patch("black.dump_to_file", dump_to_stderr)
     def test_numeric_literals_ignoring_underscores(self) -> None:
         source, expected = read_data("numeric_literals_skip_underscores")
     @patch("black.dump_to_file", dump_to_stderr)
     def test_numeric_literals_ignoring_underscores(self) -> None:
         source, expected = read_data("numeric_literals_skip_underscores")

-        mode = replace(DEFAULT_MODE, target_versions=black.PY36_VERSIONS)
+        mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)

         actual = fs(source, mode=mode)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)
         actual = fs(source, mode=mode)
         self.assertFormatEqual(expected, actual)
         black.assert_equivalent(source, actual)


@@ -798,6 +760,16 @@ class BlackTestCase(unittest.TestCase):
             black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, DEFAULT_MODE)
 
             black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, DEFAULT_MODE)
 

+    @patch("black.dump_to_file", dump_to_stderr)
+    def test_python39(self) -> None:
+        source, expected = read_data("python39")
+        actual = fs(source)
+        self.assertFormatEqual(expected, actual)
+        major, minor = sys.version_info[:2]
+        if major > 3 or (major == 3 and minor >= 9):
+            black.assert_equivalent(source, actual)
+        black.assert_stable(source, actual, DEFAULT_MODE)
+

     @patch("black.dump_to_file", dump_to_stderr)
     def test_fmtonoff(self) -> None:
         source, expected = read_data("fmtonoff")
     @patch("black.dump_to_file", dump_to_stderr)
     def test_fmtonoff(self) -> None:
         source, expected = read_data("fmtonoff")


@@ -1210,6 +1182,39 @@ class BlackTestCase(unittest.TestCase):
         black.lib2to3_parse(py3_only, {TargetVersion.PY36})
         black.lib2to3_parse(py3_only, {TargetVersion.PY27, TargetVersion.PY36})
 
         black.lib2to3_parse(py3_only, {TargetVersion.PY36})
         black.lib2to3_parse(py3_only, {TargetVersion.PY27, TargetVersion.PY36})
 

+    def test_get_features_used_decorator(self) -> None:
+        # Test the feature detection of new decorator syntax
+        # since this makes some test cases of test_get_features_used()
+        # fails if it fails, this is tested first so that a useful case
+        # is identified
+        simples, relaxed = read_data("decorators")
+        # skip explanation comments at the top of the file
+        for simple_test in simples.split("##")[1:]:
+            node = black.lib2to3_parse(simple_test)
+            decorator = str(node.children[0].children[0]).strip()
+            self.assertNotIn(
+                Feature.RELAXED_DECORATORS,
+                black.get_features_used(node),
+                msg=(
+                    f"decorator '{decorator}' follows python<=3.8 syntax"
+                    "but is detected as 3.9+"
+                    # f"The full node is\n{node!r}"
+                ),
+            )
+        # skip the '# output' comment at the top of the output part
+        for relaxed_test in relaxed.split("##")[1:]:
+            node = black.lib2to3_parse(relaxed_test)
+            decorator = str(node.children[0].children[0]).strip()
+            self.assertIn(
+                Feature.RELAXED_DECORATORS,
+                black.get_features_used(node),
+                msg=(
+                    f"decorator '{decorator}' uses python3.9+ syntax"
+                    "but is detected as python<=3.8"
+                    # f"The full node is\n{node!r}"
+                ),
+            )
+

     def test_get_features_used(self) -> None:
         node = black.lib2to3_parse("def f(*, arg): ...\n")
         self.assertEqual(black.get_features_used(node), set())
     def test_get_features_used(self) -> None:
         node = black.lib2to3_parse("def f(*, arg): ...\n")
         self.assertEqual(black.get_features_used(node), set())


@@ -1394,9 +1399,55 @@ class BlackTestCase(unittest.TestCase):
             src = (workspace / "test.py").resolve()
             with src.open("w") as fobj:
                 fobj.write("print('hello')")
             src = (workspace / "test.py").resolve()
             with src.open("w") as fobj:
                 fobj.write("print('hello')")

-            self.invokeBlack([str(src), "--diff"])
-            cache_file = black.get_cache_file(mode)
-            self.assertFalse(cache_file.exists())
+            with patch("black.read_cache") as read_cache, patch(
+                "black.write_cache"
+            ) as write_cache:
+                self.invokeBlack([str(src), "--diff"])
+                cache_file = black.get_cache_file(mode)
+                self.assertFalse(cache_file.exists())
+                write_cache.assert_not_called()
+                read_cache.assert_not_called()
+
+    def test_no_cache_when_writeback_color_diff(self) -> None:
+        mode = DEFAULT_MODE
+        with cache_dir() as workspace:
+            src = (workspace / "test.py").resolve()
+            with src.open("w") as fobj:
+                fobj.write("print('hello')")
+            with patch("black.read_cache") as read_cache, patch(
+                "black.write_cache"
+            ) as write_cache:
+                self.invokeBlack([str(src), "--diff", "--color"])
+                cache_file = black.get_cache_file(mode)
+                self.assertFalse(cache_file.exists())
+                write_cache.assert_not_called()
+                read_cache.assert_not_called()
+
+    @event_loop()
+    def test_output_locking_when_writeback_diff(self) -> None:
+        with cache_dir() as workspace:
+            for tag in range(0, 4):
+                src = (workspace / f"test{tag}.py").resolve()
+                with src.open("w") as fobj:
+                    fobj.write("print('hello')")
+            with patch("black.Manager", wraps=multiprocessing.Manager) as mgr:
+                self.invokeBlack(["--diff", str(workspace)], exit_code=0)
+                # this isn't quite doing what we want, but if it _isn't_
+                # called then we cannot be using the lock it provides
+                mgr.assert_called()
+
+    @event_loop()
+    def test_output_locking_when_writeback_color_diff(self) -> None:
+        with cache_dir() as workspace:
+            for tag in range(0, 4):
+                src = (workspace / f"test{tag}.py").resolve()
+                with src.open("w") as fobj:
+                    fobj.write("print('hello')")
+            with patch("black.Manager", wraps=multiprocessing.Manager) as mgr:
+                self.invokeBlack(["--diff", "--color", str(workspace)], exit_code=0)
+                # this isn't quite doing what we want, but if it _isn't_
+                # called then we cannot be using the lock it provides
+                mgr.assert_called()

 
     def test_no_cache_when_stdin(self) -> None:
         mode = DEFAULT_MODE
 
     def test_no_cache_when_stdin(self) -> None:
         mode = DEFAULT_MODE


@@ -1526,7 +1577,6 @@ class BlackTestCase(unittest.TestCase):
         black.assert_stable(source, actual, DEFAULT_MODE)
 
     def test_single_file_force_pyi(self) -> None:
         black.assert_stable(source, actual, DEFAULT_MODE)
 
     def test_single_file_force_pyi(self) -> None:

-        reg_mode = DEFAULT_MODE

         pyi_mode = replace(DEFAULT_MODE, is_pyi=True)
         contents, expected = read_data("force_pyi")
         with cache_dir() as workspace:
         pyi_mode = replace(DEFAULT_MODE, is_pyi=True)
         contents, expected = read_data("force_pyi")
         with cache_dir() as workspace:


@@ -1539,9 +1589,11 @@ class BlackTestCase(unittest.TestCase):
             # verify cache with --pyi is separate
             pyi_cache = black.read_cache(pyi_mode)
             self.assertIn(path, pyi_cache)
             # verify cache with --pyi is separate
             pyi_cache = black.read_cache(pyi_mode)
             self.assertIn(path, pyi_cache)

-            normal_cache = black.read_cache(reg_mode)
+            normal_cache = black.read_cache(DEFAULT_MODE)

             self.assertNotIn(path, normal_cache)
             self.assertNotIn(path, normal_cache)

-        self.assertEqual(actual, expected)
+        self.assertFormatEqual(expected, actual)
+        black.assert_equivalent(contents, actual)
+        black.assert_stable(contents, actual, pyi_mode)

 
     @event_loop()
     def test_multi_file_force_pyi(self) -> None:
 
     @event_loop()
     def test_multi_file_force_pyi(self) -> None:


@@ -1579,7 +1631,7 @@ class BlackTestCase(unittest.TestCase):
 
     def test_single_file_force_py36(self) -> None:
         reg_mode = DEFAULT_MODE
 
     def test_single_file_force_py36(self) -> None:
         reg_mode = DEFAULT_MODE

-        py36_mode = replace(DEFAULT_MODE, target_versions=black.PY36_VERSIONS)
+        py36_mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)

         source, expected = read_data("force_py36")
         with cache_dir() as workspace:
             path = (workspace / "file.py").resolve()
         source, expected = read_data("force_py36")
         with cache_dir() as workspace:
             path = (workspace / "file.py").resolve()


@@ -1598,7 +1650,7 @@ class BlackTestCase(unittest.TestCase):
     @event_loop()
     def test_multi_file_force_py36(self) -> None:
         reg_mode = DEFAULT_MODE
     @event_loop()
     def test_multi_file_force_py36(self) -> None:
         reg_mode = DEFAULT_MODE

-        py36_mode = replace(DEFAULT_MODE, target_versions=black.PY36_VERSIONS)
+        py36_mode = replace(DEFAULT_MODE, target_versions=PY36_VERSIONS)

         source, expected = read_data("force_py36")
         with cache_dir() as workspace:
             paths = [
         source, expected = read_data("force_py36")
         with cache_dir() as workspace:
             paths = [


@@ -1873,14 +1925,6 @@ class BlackTestCase(unittest.TestCase):
         ):
             ff(THIS_FILE)
 
         ):
             ff(THIS_FILE)
 

-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    def test_blackd_main(self) -> None:
-        with patch("blackd.web.run_app"):
-            result = CliRunner().invoke(blackd.main, [])
-            if result.exception is not None:
-                raise result.exception
-            self.assertEqual(result.exit_code, 0)
-

     def test_invalid_config_return_code(self) -> None:
         tmp_file = Path(black.dump_to_file())
         try:
     def test_invalid_config_return_code(self) -> None:
         tmp_file = Path(black.dump_to_file())
         try:


@@ -1939,173 +1983,22 @@ class BlackTestCase(unittest.TestCase):
             self.assertEqual(black.find_project_root((src_dir,)), src_dir.resolve())
             self.assertEqual(black.find_project_root((src_python,)), src_dir.resolve())
 
             self.assertEqual(black.find_project_root((src_dir,)), src_dir.resolve())
             self.assertEqual(black.find_project_root((src_python,)), src_dir.resolve())
 

+    def test_bpo_33660_workaround(self) -> None:
+        if system() == "Windows":
+            return

 
 

-class BlackDTestCase(AioHTTPTestCase):
-    async def get_application(self) -> web.Application:
-        return blackd.make_app()
-
-    # TODO: remove these decorators once the below is released
-    # https://github.com/aio-libs/aiohttp/pull/3727
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_request_needs_formatting(self) -> None:
-        response = await self.client.post("/", data=b"print('hello world')")
-        self.assertEqual(response.status, 200)
-        self.assertEqual(response.charset, "utf8")
-        self.assertEqual(await response.read(), b'print("hello world")\n')
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_request_no_change(self) -> None:
-        response = await self.client.post("/", data=b'print("hello world")\n')
-        self.assertEqual(response.status, 204)
-        self.assertEqual(await response.read(), b"")
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_request_syntax_error(self) -> None:
-        response = await self.client.post("/", data=b"what even ( is")
-        self.assertEqual(response.status, 400)
-        content = await response.text()
-        self.assertTrue(
-            content.startswith("Cannot parse"),
-            msg=f"Expected error to start with 'Cannot parse', got {repr(content)}",
-        )
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_unsupported_version(self) -> None:
-        response = await self.client.post(
-            "/", data=b"what", headers={blackd.PROTOCOL_VERSION_HEADER: "2"}
-        )
-        self.assertEqual(response.status, 501)
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_supported_version(self) -> None:
-        response = await self.client.post(
-            "/", data=b"what", headers={blackd.PROTOCOL_VERSION_HEADER: "1"}
-        )
-        self.assertEqual(response.status, 200)
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_invalid_python_variant(self) -> None:
-        async def check(header_value: str, expected_status: int = 400) -> None:
-            response = await self.client.post(
-                "/", data=b"what", headers={blackd.PYTHON_VARIANT_HEADER: header_value}
-            )
-            self.assertEqual(response.status, expected_status)
-
-        await check("lol")
-        await check("ruby3.5")
-        await check("pyi3.6")
-        await check("py1.5")
-        await check("2.8")
-        await check("py2.8")
-        await check("3.0")
-        await check("pypy3.0")
-        await check("jython3.4")
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_pyi(self) -> None:
-        source, expected = read_data("stub.pyi")
-        response = await self.client.post(
-            "/", data=source, headers={blackd.PYTHON_VARIANT_HEADER: "pyi"}
-        )
-        self.assertEqual(response.status, 200)
-        self.assertEqual(await response.text(), expected)
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_diff(self) -> None:
-        diff_header = re.compile(
-            r"(In|Out)\t\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d\.\d\d\d\d\d\d \+\d\d\d\d"
-        )
-
-        source, _ = read_data("blackd_diff.py")
-        expected, _ = read_data("blackd_diff.diff")
-
-        response = await self.client.post(
-            "/", data=source, headers={blackd.DIFF_HEADER: "true"}
-        )
-        self.assertEqual(response.status, 200)
-
-        actual = await response.text()
-        actual = diff_header.sub(DETERMINISTIC_HEADER, actual)
-        self.assertEqual(actual, expected)
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_python_variant(self) -> None:
-        code = (
-            "def f(\n"
-            "    and_has_a_bunch_of,\n"
-            "    very_long_arguments_too,\n"
-            "    and_lots_of_them_as_well_lol,\n"
-            "    **and_very_long_keyword_arguments\n"
-            "):\n"
-            "    pass\n"
-        )
-
-        async def check(header_value: str, expected_status: int) -> None:
-            response = await self.client.post(
-                "/", data=code, headers={blackd.PYTHON_VARIANT_HEADER: header_value}
-            )
-            self.assertEqual(
-                response.status, expected_status, msg=await response.text()
-            )
+        # https://bugs.python.org/issue33660

 
 

-        await check("3.6", 200)
-        await check("py3.6", 200)
-        await check("3.6,3.7", 200)
-        await check("3.6,py3.7", 200)
-        await check("py36,py37", 200)
-        await check("36", 200)
-        await check("3.6.4", 200)
-
-        await check("2", 204)
-        await check("2.7", 204)
-        await check("py2.7", 204)
-        await check("3.4", 204)
-        await check("py3.4", 204)
-        await check("py34,py36", 204)
-        await check("34", 204)
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_line_length(self) -> None:
-        response = await self.client.post(
-            "/", data=b'print("hello")\n', headers={blackd.LINE_LENGTH_HEADER: "7"}
-        )
-        self.assertEqual(response.status, 200)
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_invalid_line_length(self) -> None:
-        response = await self.client.post(
-            "/", data=b'print("hello")\n', headers={blackd.LINE_LENGTH_HEADER: "NaN"}
-        )
-        self.assertEqual(response.status, 400)
-
-    @skip_if_exception("ClientOSError")
-    @unittest.skipUnless(has_blackd_deps, "blackd's dependencies are not installed")
-    @unittest_run_loop
-    async def test_blackd_response_black_version_header(self) -> None:
-        response = await self.client.post("/")
-        self.assertIsNotNone(response.headers.get(blackd.BLACK_VERSION_HEADER))
+        old_cwd = Path.cwd()
+        try:
+            root = Path("/")
+            os.chdir(str(root))
+            path = Path("workspace") / "project"
+            report = black.Report(verbose=True)
+            normalized_path = black.normalize_path_maybe_ignore(path, root, report)
+            self.assertEqual(normalized_path, "workspace/project")
+        finally:
+            os.chdir(str(old_cwd))

 
 
 with open(black.__file__, "r", encoding="utf-8") as _bf:
 
 
 with open(black.__file__, "r", encoding="utf-8") as _bf: