]> git.madduck.net Git - etc/vim.git/blobdiff - tests/test_black.py

madduck's git repository

Every one of the projects in this repository is available at the canonical URL git://git.madduck.net/madduck/pub/<projectpath> — see each project's metadata for the exact URL.

All patches and comments are welcome. Please squash your changes to logical commits before using git-format-patch and git-send-email to patches@git.madduck.net. If you'd read over the Git project's submission guidelines and adhered to them, I'd be especially grateful.

SSH access, as well as push access can be individually arranged.

If you use my repositories frequently, consider adding the following snippet to ~/.gitconfig and using the third clone URL listed for each project:

[url "git://git.madduck.net/madduck/"]
  insteadOf = madduck:

Fix crash on some power hugging cases (#2806)
[etc/vim.git] / tests / test_black.py
index 1fc63c942e9089aed7e34320d8f23a94910c5ba2..2dd284f2cd6ed176f030e986f1aacaf13d4dc823 100644 (file)
@@ -31,7 +31,7 @@ from unittest.mock import MagicMock, patch
 
 import click
 import pytest
-import regex as re
+import re
 from click import unstyle
 from click.testing import CliRunner
 from pathspec import PathSpec
@@ -40,7 +40,7 @@ import black
 import black.files
 from black import Feature, TargetVersion
 from black import re_compile_maybe_verbose as compile_pattern
-from black.cache import get_cache_file
+from black.cache import get_cache_dir, get_cache_file
 from black.debug import DebugVisitor
 from black.output import color_diff, diff
 from black.report import Report
@@ -50,6 +50,7 @@ from tests.util import (
     DATA_DIR,
     DEFAULT_MODE,
     DETERMINISTIC_HEADER,
+    PROJECT_ROOT,
     PY36_VERSIONS,
     THIS_DIR,
     BlackBaseTestCase,
@@ -69,7 +70,7 @@ T = TypeVar("T")
 R = TypeVar("R")
 
 # Match the time output in a diff, but nothing else
-DIFF_TIME = re.compile(r"\t[\d-:+\. ]+")
+DIFF_TIME = re.compile(r"\t[\d\-:+\. ]+")
 
 
 @contextmanager
@@ -99,6 +100,8 @@ class FakeContext(click.Context):
 
     def __init__(self) -> None:
         self.default_map: Dict[str, Any] = {}
+        # Dummy root, since most of the tests don't care about it
+        self.obj: Dict[str, Any] = {"root": PROJECT_ROOT}
 
 
 class FakeParameter(click.Parameter):
@@ -121,7 +124,7 @@ def invokeBlack(
     runner = BlackRunner()
     if ignore_config:
         args = ["--verbose", "--config", str(THIS_DIR / "empty.toml"), *args]
-    result = runner.invoke(black.main, args)
+    result = runner.invoke(black.main, args, catch_exceptions=False)
     assert result.stdout_bytes is not None
     assert result.stderr_bytes is not None
     msg = (
@@ -147,6 +150,11 @@ class BlackTestCase(BlackBaseTestCase):
             os.unlink(tmp_file)
         self.assertFormatEqual(expected, actual)
 
+    def test_experimental_string_processing_warns(self) -> None:
+        self.assertWarns(
+            black.mode.Deprecated, black.Mode, experimental_string_processing=True
+        )
+
     def test_piping(self) -> None:
         source, expected = read_data("src/black/__init__", data=False)
         result = BlackRunner().invoke(
@@ -199,7 +207,7 @@ class BlackTestCase(BlackBaseTestCase):
         )
         actual = result.output
         # Again, the contents are checked in a different test, so only look for colors.
-        self.assertIn("\033[1;37m", actual)
+        self.assertIn("\033[1m", actual)
         self.assertIn("\033[36m", actual)
         self.assertIn("\033[32m", actual)
         self.assertIn("\033[31m", actual)
@@ -220,45 +228,6 @@ class BlackTestCase(BlackBaseTestCase):
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, black.FileMode())
 
-    @unittest.expectedFailure
-    @patch("black.dump_to_file", dump_to_stderr)
-    def test_trailing_comma_optional_parens_stability1(self) -> None:
-        source, _expected = read_data("trailing_comma_optional_parens1")
-        actual = fs(source)
-        black.assert_stable(source, actual, DEFAULT_MODE)
-
-    @unittest.expectedFailure
-    @patch("black.dump_to_file", dump_to_stderr)
-    def test_trailing_comma_optional_parens_stability2(self) -> None:
-        source, _expected = read_data("trailing_comma_optional_parens2")
-        actual = fs(source)
-        black.assert_stable(source, actual, DEFAULT_MODE)
-
-    @unittest.expectedFailure
-    @patch("black.dump_to_file", dump_to_stderr)
-    def test_trailing_comma_optional_parens_stability3(self) -> None:
-        source, _expected = read_data("trailing_comma_optional_parens3")
-        actual = fs(source)
-        black.assert_stable(source, actual, DEFAULT_MODE)
-
-    @patch("black.dump_to_file", dump_to_stderr)
-    def test_trailing_comma_optional_parens_stability1_pass2(self) -> None:
-        source, _expected = read_data("trailing_comma_optional_parens1")
-        actual = fs(fs(source))  # this is what `format_file_contents` does with --safe
-        black.assert_stable(source, actual, DEFAULT_MODE)
-
-    @patch("black.dump_to_file", dump_to_stderr)
-    def test_trailing_comma_optional_parens_stability2_pass2(self) -> None:
-        source, _expected = read_data("trailing_comma_optional_parens2")
-        actual = fs(fs(source))  # this is what `format_file_contents` does with --safe
-        black.assert_stable(source, actual, DEFAULT_MODE)
-
-    @patch("black.dump_to_file", dump_to_stderr)
-    def test_trailing_comma_optional_parens_stability3_pass2(self) -> None:
-        source, _expected = read_data("trailing_comma_optional_parens3")
-        actual = fs(fs(source))  # this is what `format_file_contents` does with --safe
-        black.assert_stable(source, actual, DEFAULT_MODE)
-
     def test_pep_572_version_detection(self) -> None:
         source, _ = read_data("pep_572")
         root = black.lib2to3_parse(source)
@@ -322,7 +291,7 @@ class BlackTestCase(BlackBaseTestCase):
         actual = result.output
         # We check the contents of the diff in `test_expression_diff`. All
         # we need to check here is that color codes exist in the result.
-        self.assertIn("\033[1;37m", actual)
+        self.assertIn("\033[1m", actual)
         self.assertIn("\033[36m", actual)
         self.assertIn("\033[32m", actual)
         self.assertIn("\033[31m", actual)
@@ -339,7 +308,7 @@ class BlackTestCase(BlackBaseTestCase):
     @patch("black.dump_to_file", dump_to_stderr)
     def test_string_quotes(self) -> None:
         source, expected = read_data("string_quotes")
-        mode = black.Mode(experimental_string_processing=True)
+        mode = black.Mode(preview=True)
         assert_format(source, expected, mode)
         mode = replace(mode, string_normalization=False)
         not_normalized = fs(source, mode=mode)
@@ -723,24 +692,15 @@ class BlackTestCase(BlackBaseTestCase):
 
         straddling = "x + y"
         black.lib2to3_parse(straddling)
-        black.lib2to3_parse(straddling, {TargetVersion.PY27})
         black.lib2to3_parse(straddling, {TargetVersion.PY36})
-        black.lib2to3_parse(straddling, {TargetVersion.PY27, TargetVersion.PY36})
 
         py2_only = "print x"
-        black.lib2to3_parse(py2_only)
-        black.lib2to3_parse(py2_only, {TargetVersion.PY27})
         with self.assertRaises(black.InvalidInput):
             black.lib2to3_parse(py2_only, {TargetVersion.PY36})
-        with self.assertRaises(black.InvalidInput):
-            black.lib2to3_parse(py2_only, {TargetVersion.PY27, TargetVersion.PY36})
 
         py3_only = "exec(x, end=y)"
         black.lib2to3_parse(py3_only)
-        with self.assertRaises(black.InvalidInput):
-            black.lib2to3_parse(py3_only, {TargetVersion.PY27})
         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
@@ -809,6 +769,44 @@ class BlackTestCase(BlackBaseTestCase):
         self.assertEqual(black.get_features_used(node), {Feature.POS_ONLY_ARGUMENTS})
         node = black.lib2to3_parse("def fn(a, /, b): ...")
         self.assertEqual(black.get_features_used(node), {Feature.POS_ONLY_ARGUMENTS})
+        node = black.lib2to3_parse("def fn(): yield a, b")
+        self.assertEqual(black.get_features_used(node), set())
+        node = black.lib2to3_parse("def fn(): return a, b")
+        self.assertEqual(black.get_features_used(node), set())
+        node = black.lib2to3_parse("def fn(): yield *b, c")
+        self.assertEqual(black.get_features_used(node), {Feature.UNPACKING_ON_FLOW})
+        node = black.lib2to3_parse("def fn(): return a, *b, c")
+        self.assertEqual(black.get_features_used(node), {Feature.UNPACKING_ON_FLOW})
+        node = black.lib2to3_parse("x = a, *b, c")
+        self.assertEqual(black.get_features_used(node), set())
+        node = black.lib2to3_parse("x: Any = regular")
+        self.assertEqual(black.get_features_used(node), set())
+        node = black.lib2to3_parse("x: Any = (regular, regular)")
+        self.assertEqual(black.get_features_used(node), set())
+        node = black.lib2to3_parse("x: Any = Complex(Type(1))[something]")
+        self.assertEqual(black.get_features_used(node), set())
+        node = black.lib2to3_parse("x: Tuple[int, ...] = a, b, c")
+        self.assertEqual(
+            black.get_features_used(node), {Feature.ANN_ASSIGN_EXTENDED_RHS}
+        )
+
+    def test_get_features_used_for_future_flags(self) -> None:
+        for src, features in [
+            ("from __future__ import annotations", {Feature.FUTURE_ANNOTATIONS}),
+            (
+                "from __future__ import (other, annotations)",
+                {Feature.FUTURE_ANNOTATIONS},
+            ),
+            ("a = 1 + 2\nfrom something import annotations", set()),
+            ("from __future__ import x, y", set()),
+        ]:
+            with self.subTest(src=src, features=features):
+                node = black.lib2to3_parse(src)
+                future_imports = black.get_future_imports(node)
+                self.assertEqual(
+                    black.get_features_used(node, future_imports=future_imports),
+                    features,
+                )
 
     def test_get_future_imports(self) -> None:
         node = black.lib2to3_parse("\n")
@@ -840,6 +838,7 @@ class BlackTestCase(BlackBaseTestCase):
         )
         self.assertEqual({"unicode_literals", "print"}, black.get_future_imports(node))
 
+    @pytest.mark.incompatible_with_mypyc
     def test_debug_visitor(self) -> None:
         source, _ = read_data("debug_visitor.py")
         expected, _ = read_data("debug_visitor.out")
@@ -890,6 +889,7 @@ class BlackTestCase(BlackBaseTestCase):
         self.assertEqual(len(n.children), 1)
         self.assertEqual(n.children[0].type, black.token.ENDMARKER)
 
+    @pytest.mark.incompatible_with_mypyc
     @unittest.skipIf(os.environ.get("SKIP_AST_PRINT"), "user set SKIP_AST_PRINT")
     def test_assertFormatEqual(self) -> None:
         out_lines = []
@@ -906,8 +906,8 @@ class BlackTestCase(BlackBaseTestCase):
                 self.assertFormatEqual("j = [1, 2, 3]", "j = [1, 2, 3,]")
 
         out_str = "".join(out_lines)
-        self.assertTrue("Expected tree:" in out_str)
-        self.assertTrue("Actual tree:" in out_str)
+        self.assertIn("Expected tree:", out_str)
+        self.assertIn("Actual tree:", out_str)
         self.assertEqual("".join(err_lines), "")
 
     @event_loop()
@@ -933,17 +933,20 @@ class BlackTestCase(BlackBaseTestCase):
             # Multi file command.
             self.invokeBlack([str(src1), str(src2), "--diff", "--check"], exit_code=1)
 
-    def test_no_files(self) -> None:
+    def test_no_src_fails(self) -> None:
+        with cache_dir():
+            self.invokeBlack([], exit_code=1)
+
+    def test_src_and_code_fails(self) -> None:
         with cache_dir():
-            # Without an argument, black exits with error code 0.
-            self.invokeBlack([])
+            self.invokeBlack([".", "-c", "0"], exit_code=1)
 
     def test_broken_symlink(self) -> None:
         with cache_dir() as workspace:
             symlink = workspace / "broken_link.py"
             try:
                 symlink.symlink_to("nonexistent.py")
-            except OSError as e:
+            except (OSError, NotImplementedError) as e:
                 self.skipTest(f"Can't create symlinks: {e}")
             self.invokeBlack([str(workspace.resolve())])
 
@@ -1054,6 +1057,7 @@ class BlackTestCase(BlackBaseTestCase):
         actual = result.output
         self.assertFormatEqual(actual, expected)
 
+    @pytest.mark.incompatible_with_mypyc
     def test_reformat_one_with_stdin(self) -> None:
         with patch(
             "black.format_stdin_to_stdout",
@@ -1071,6 +1075,7 @@ class BlackTestCase(BlackBaseTestCase):
             fsts.assert_called_once()
             report.done.assert_called_with(path, black.Changed.YES)
 
+    @pytest.mark.incompatible_with_mypyc
     def test_reformat_one_with_stdin_filename(self) -> None:
         with patch(
             "black.format_stdin_to_stdout",
@@ -1093,6 +1098,7 @@ class BlackTestCase(BlackBaseTestCase):
             # __BLACK_STDIN_FILENAME__ should have been stripped
             report.done.assert_called_with(expected, black.Changed.YES)
 
+    @pytest.mark.incompatible_with_mypyc
     def test_reformat_one_with_stdin_filename_pyi(self) -> None:
         with patch(
             "black.format_stdin_to_stdout",
@@ -1117,6 +1123,7 @@ class BlackTestCase(BlackBaseTestCase):
             # __BLACK_STDIN_FILENAME__ should have been stripped
             report.done.assert_called_with(expected, black.Changed.YES)
 
+    @pytest.mark.incompatible_with_mypyc
     def test_reformat_one_with_stdin_filename_ipynb(self) -> None:
         with patch(
             "black.format_stdin_to_stdout",
@@ -1141,6 +1148,7 @@ class BlackTestCase(BlackBaseTestCase):
             # __BLACK_STDIN_FILENAME__ should have been stripped
             report.done.assert_called_with(expected, black.Changed.YES)
 
+    @pytest.mark.incompatible_with_mypyc
     def test_reformat_one_with_stdin_and_existing_path(self) -> None:
         with patch(
             "black.format_stdin_to_stdout",
@@ -1185,13 +1193,18 @@ class BlackTestCase(BlackBaseTestCase):
 
     def test_required_version_matches_version(self) -> None:
         self.invokeBlack(
-            ["--required-version", black.__version__], exit_code=0, ignore_config=True
+            ["--required-version", black.__version__, "-c", "0"],
+            exit_code=0,
+            ignore_config=True,
         )
 
     def test_required_version_does_not_match_version(self) -> None:
-        self.invokeBlack(
-            ["--required-version", "20.99b"], exit_code=1, ignore_config=True
+        result = BlackRunner().invoke(
+            black.main,
+            ["--required-version", "20.99b", "-c", "0"],
         )
+        self.assertEqual(result.exit_code, 1)
+        self.assertIn("required version", result.stderr)
 
     def test_preserves_line_endings(self) -> None:
         with TemporaryDirectory() as workspace:
@@ -1278,6 +1291,7 @@ class BlackTestCase(BlackBaseTestCase):
         self.assertEqual(config["color"], True)
         self.assertEqual(config["line_length"], 79)
         self.assertEqual(config["target_version"], ["py36", "py37", "py38"])
+        self.assertEqual(config["python_cell_magics"], ["custom1", "custom2"])
         self.assertEqual(config["exclude"], r"\.pyi?$")
         self.assertEqual(config["include"], r"\.py?$")
 
@@ -1295,6 +1309,7 @@ class BlackTestCase(BlackBaseTestCase):
         self.assertEqual(config["exclude"], r"\.pyi?$")
         self.assertEqual(config["include"], r"\.py?$")
 
+    @pytest.mark.incompatible_with_mypyc
     def test_find_project_root(self) -> None:
         with TemporaryDirectory() as workspace:
             root = Path(workspace)
@@ -1312,10 +1327,17 @@ class BlackTestCase(BlackBaseTestCase):
             src_python.touch()
 
             self.assertEqual(
-                black.find_project_root((src_dir, test_dir)), root.resolve()
+                black.find_project_root((src_dir, test_dir)),
+                (root.resolve(), "pyproject.toml"),
+            )
+            self.assertEqual(
+                black.find_project_root((src_dir,)),
+                (src_dir.resolve(), "pyproject.toml"),
+            )
+            self.assertEqual(
+                black.find_project_root((src_python,)),
+                (src_dir.resolve(), "pyproject.toml"),
             )
-            self.assertEqual(black.find_project_root((src_dir,)), src_dir.resolve())
-            self.assertEqual(black.find_project_root((src_python,)), src_dir.resolve())
 
     @patch(
         "black.files.find_user_pyproject_toml",
@@ -1389,27 +1411,6 @@ class BlackTestCase(BlackBaseTestCase):
         actual = diff_header.sub(DETERMINISTIC_HEADER, actual)
         self.assertEqual(actual, expected)
 
-    @pytest.mark.python2
-    def test_docstring_reformat_for_py27(self) -> None:
-        """
-        Check that stripping trailing whitespace from Python 2 docstrings
-        doesn't trigger a "not equivalent to source" error
-        """
-        source = (
-            b'def foo():\r\n    """Testing\r\n    Testing """\r\n    print "Foo"\r\n'
-        )
-        expected = 'def foo():\n    """Testing\n    Testing"""\n    print "Foo"\n'
-
-        result = CliRunner().invoke(
-            black.main,
-            ["-", "-q", "--target-version=py27"],
-            input=BytesIO(source),
-        )
-
-        self.assertEqual(result.exit_code, 0)
-        actual = result.output
-        self.assertFormatEqual(actual, expected)
-
     @staticmethod
     def compare_results(
         result: click.testing.Result, expected_value: str, expected_exit_code: int
@@ -1482,6 +1483,7 @@ class BlackTestCase(BlackBaseTestCase):
         assert output == result_diff, "The output did not match the expected value."
         assert result.exit_code == 0, "The exit code is incorrect."
 
+    @pytest.mark.incompatible_with_mypyc
     def test_code_option_safe(self) -> None:
         """Test that the code option throws an error when the sanity checks fail."""
         # Patch black.assert_equivalent to ensure the sanity checks fail
@@ -1506,15 +1508,18 @@ class BlackTestCase(BlackBaseTestCase):
 
             self.compare_results(result, formatted, 0)
 
+    @pytest.mark.incompatible_with_mypyc
     def test_code_option_config(self) -> None:
         """
         Test that the code option finds the pyproject.toml in the current directory.
         """
         with patch.object(black, "parse_pyproject_toml", return_value={}) as parse:
             args = ["--code", "print"]
-            CliRunner().invoke(black.main, args)
+            # This is the only directory known to contain a pyproject.toml
+            with change_directory(PROJECT_ROOT):
+                CliRunner().invoke(black.main, args)
+                pyproject_path = Path(Path.cwd(), "pyproject.toml").resolve()
 
-            pyproject_path = Path(Path().cwd(), "pyproject.toml").resolve()
             assert (
                 len(parse.mock_calls) >= 1
             ), "Expected config parse to be called with the current directory."
@@ -1524,12 +1529,13 @@ class BlackTestCase(BlackBaseTestCase):
                 call_args[0].lower() == str(pyproject_path).lower()
             ), "Incorrect config loaded."
 
+    @pytest.mark.incompatible_with_mypyc
     def test_code_option_parent_config(self) -> None:
         """
         Test that the code option finds the pyproject.toml in the parent directory.
         """
         with patch.object(black, "parse_pyproject_toml", return_value={}) as parse:
-            with change_directory(Path("tests")):
+            with change_directory(THIS_DIR):
                 args = ["--code", "print"]
                 CliRunner().invoke(black.main, args)
 
@@ -1543,8 +1549,54 @@ class BlackTestCase(BlackBaseTestCase):
                     call_args[0].lower() == str(pyproject_path).lower()
                 ), "Incorrect config loaded."
 
+    def test_for_handled_unexpected_eof_error(self) -> None:
+        """
+        Test that an unexpected EOF SyntaxError is nicely presented.
+        """
+        with pytest.raises(black.parsing.InvalidInput) as exc_info:
+            black.lib2to3_parse("print(", {})
+
+        exc_info.match("Cannot parse: 2:0: EOF in multi-line statement")
+
+    def test_equivalency_ast_parse_failure_includes_error(self) -> None:
+        with pytest.raises(AssertionError) as err:
+            black.assert_equivalent("a«»a  = 1", "a«»a  = 1")
+
+        err.match("--safe")
+        # Unfortunately the SyntaxError message has changed in newer versions so we
+        # can't match it directly.
+        err.match("invalid character")
+        err.match(r"\(<unknown>, line 1\)")
+
 
 class TestCaching:
+    def test_get_cache_dir(
+        self,
+        tmp_path: Path,
+        monkeypatch: pytest.MonkeyPatch,
+    ) -> None:
+        # Create multiple cache directories
+        workspace1 = tmp_path / "ws1"
+        workspace1.mkdir()
+        workspace2 = tmp_path / "ws2"
+        workspace2.mkdir()
+
+        # Force user_cache_dir to use the temporary directory for easier assertions
+        patch_user_cache_dir = patch(
+            target="black.cache.user_cache_dir",
+            autospec=True,
+            return_value=str(workspace1),
+        )
+
+        # If BLACK_CACHE_DIR is not set, use user_cache_dir
+        monkeypatch.delenv("BLACK_CACHE_DIR", raising=False)
+        with patch_user_cache_dir:
+            assert get_cache_dir() == workspace1
+
+        # If it is set, use the path provided in the env var.
+        monkeypatch.setenv("BLACK_CACHE_DIR", str(workspace2))
+        assert get_cache_dir() == workspace2
+
     def test_cache_broken_file(self) -> None:
         mode = DEFAULT_MODE
         with cache_dir() as workspace:
@@ -1715,6 +1767,7 @@ def assert_collected_sources(
     src: Sequence[Union[str, Path]],
     expected: Sequence[Union[str, Path]],
     *,
+    ctx: Optional[FakeContext] = None,
     exclude: Optional[str] = None,
     include: Optional[str] = None,
     extend_exclude: Optional[str] = None,
@@ -1730,7 +1783,7 @@ def assert_collected_sources(
     )
     gs_force_exclude = None if force_exclude is None else compile_pattern(force_exclude)
     collected = black.get_sources(
-        ctx=FakeContext(),
+        ctx=ctx or FakeContext(),
         src=gs_src,
         quiet=False,
         verbose=False,
@@ -1741,7 +1794,7 @@ def assert_collected_sources(
         report=black.Report(),
         stdin_filename=stdin_filename,
     )
-    assert sorted(list(collected)) == sorted(gs_expected)
+    assert sorted(collected) == sorted(gs_expected)
 
 
 class TestFileCollection:
@@ -1766,9 +1819,11 @@ class TestFileCollection:
             base / "b/.definitely_exclude/a.pyi",
         ]
         src = [base / "b/"]
-        assert_collected_sources(src, expected, extend_exclude=r"/exclude/")
+        ctx = FakeContext()
+        ctx.obj["root"] = base
+        assert_collected_sources(src, expected, ctx=ctx, extend_exclude=r"/exclude/")
 
-    @patch("black.find_project_root", lambda *args: THIS_DIR.resolve())
+    @patch("black.find_project_root", lambda *args: (THIS_DIR.resolve(), None))
     def test_exclude_for_issue_1572(self) -> None:
         # Exclude shouldn't touch files that were explicitly given to Black through the
         # CLI. Exclude is supposed to only apply to the recursive discovery of files.
@@ -1891,6 +1946,7 @@ class TestFileCollection:
             src, expected, exclude=r"\.pyi$", extend_exclude=r"\.definitely_exclude"
         )
 
+    @pytest.mark.incompatible_with_mypyc
     def test_symlink_out_of_root_directory(self) -> None:
         path = MagicMock()
         root = THIS_DIR.resolve()
@@ -1950,13 +2006,13 @@ class TestFileCollection:
         child.is_symlink.assert_called()
         assert child.is_symlink.call_count == 2
 
-    @patch("black.find_project_root", lambda *args: THIS_DIR.resolve())
+    @patch("black.find_project_root", lambda *args: (THIS_DIR.resolve(), None))
     def test_get_sources_with_stdin(self) -> None:
         src = ["-"]
         expected = ["-"]
         assert_collected_sources(src, expected, include="", exclude=r"/exclude/|a\.py")
 
-    @patch("black.find_project_root", lambda *args: THIS_DIR.resolve())
+    @patch("black.find_project_root", lambda *args: (THIS_DIR.resolve(), None))
     def test_get_sources_with_stdin_filename(self) -> None:
         src = ["-"]
         stdin_filename = str(THIS_DIR / "data/collections.py")
@@ -1968,7 +2024,7 @@ class TestFileCollection:
             stdin_filename=stdin_filename,
         )
 
-    @patch("black.find_project_root", lambda *args: THIS_DIR.resolve())
+    @patch("black.find_project_root", lambda *args: (THIS_DIR.resolve(), None))
     def test_get_sources_with_stdin_filename_and_exclude(self) -> None:
         # Exclude shouldn't exclude stdin_filename since it is mimicking the
         # file being passed directly. This is the same as
@@ -1984,7 +2040,7 @@ class TestFileCollection:
             stdin_filename=stdin_filename,
         )
 
-    @patch("black.find_project_root", lambda *args: THIS_DIR.resolve())
+    @patch("black.find_project_root", lambda *args: (THIS_DIR.resolve(), None))
     def test_get_sources_with_stdin_filename_and_extend_exclude(self) -> None:
         # Extend exclude shouldn't exclude stdin_filename since it is mimicking the
         # file being passed directly. This is the same as
@@ -2000,7 +2056,7 @@ class TestFileCollection:
             stdin_filename=stdin_filename,
         )
 
-    @patch("black.find_project_root", lambda *args: THIS_DIR.resolve())
+    @patch("black.find_project_root", lambda *args: (THIS_DIR.resolve(), None))
     def test_get_sources_with_stdin_filename_and_force_exclude(self) -> None:
         # Force exclude should exclude the file when passing it through
         # stdin_filename
@@ -2014,8 +2070,12 @@ class TestFileCollection:
         )
 
 
-with open(black.__file__, "r", encoding="utf-8") as _bf:
-    black_source_lines = _bf.readlines()
+try:
+    with open(black.__file__, "r", encoding="utf-8") as _bf:
+        black_source_lines = _bf.readlines()
+except UnicodeDecodeError:
+    if not black.COMPILED:
+        raise
 
 
 def tracefunc(