hon_requires': '>=3.0, !=3.1'}
    dist = Distribution(attrs)
    check_specifier(dist, attrs, attrs['python_requires'])

    attrs = {'name': 'foo', 'python_requires': ['>=3.0', '!=3.1']}
    dist = Distribution(attrs)
    check_specifier(dist, attrs, attrs['python_requires'])

    # invalid specifier value
    attrs = {'name': 'foo', 'python_requires': '>=invalid-version'}
    with pytest.raises(DistutilsSetupError):
        dist = Distribution(attrs)


def test_metadata_name():
    with pytest.raises(DistutilsSetupError, match='missing.*name'):
        Distribution()._validate_metadata()


@pytest.mark.parametrize(
    ('dist_name', 'py_module'),
    [
        ("my.pkg", "my_pkg"),
        ("my-pkg", "my_pkg"),
        ("my_pkg", "my_pkg"),
        ("pkg", "pkg"),
    ],
)
def test_dist_default_py_modules(tmp_path, dist_name, py_module):
    (tmp_path / f"{py_module}.py").touch()

    (tmp_path / "setup.py").touch()
    (tmp_path / "noxfile.py").touch()
    # ^-- make sure common tool files are ignored

    attrs = {**EXAMPLE_BASE_INFO, "name": dist_name, "src_root": str(tmp_path)}
    # Find `py_modules` corresponding to dist_name if not given
    dist = Distribution(attrs)
    dist.set_defaults()
    assert dist.py_modules == [py_module]
    # When `py_modules` is given, don't do anything
    dist = Distribution({**attrs, "py_modules": ["explicity_py_module"]})
    dist.set_defaults()
    assert dist.py_modules == ["explicity_py_module"]
    # When `packages` is given, don't do anything
    dist = Distribution({**attrs, "packages": ["explicity_package"]})
    dist.set_defaults()
    assert not dist.py_modules


@pytest.mark.parametrize(
    ('dist_name', 'package_dir', 'package_files', 'packages'),
    [
        ("my.pkg", None, ["my_pkg/__init__.py", "my_pkg/mod.py"], ["my_pkg"]),
        ("my-pkg", None, ["my_pkg/__init__.py", "my_pkg/mod.py"], ["my_pkg"]),
        ("my_pkg", None, ["my_pkg/__init__.py", "my_pkg/mod.py"], ["my_pkg"]),
        ("my.pkg", None, ["my/pkg/__init__.py"], ["my", "my.pkg"]),
        (
            "my_pkg",
            None,
            ["src/my_pkg/__init__.py", "src/my_pkg2/__init__.py"],
            ["my_pkg", "my_pkg2"],
        ),
        (
            "my_pkg",
            {"pkg": "lib", "pkg2": "lib2"},
            ["lib/__init__.py", "lib/nested/__init__.pyt", "lib2/__init__.py"],
            ["pkg", "pkg.nested", "pkg2"],
        ),
    ],
)
def test_dist_default_packages(
    tmp_path, dist_name, package_dir, package_files, packages
):
    ensure_files(tmp_path, package_files)

    (tmp_path / "setup.py").touch()
    (tmp_path / "noxfile.py").touch()
    # ^-- should not be included by default

    attrs = {
        **EXAMPLE_BASE_INFO,
        "name": dist_name,
        "src_root": str(tmp_path),
        "package_dir": package_dir,
    }
    # Find `packages` either corresponding to dist_name or inside src
    dist = Distribution(attrs)
    dist.set_defaults()
    assert not dist.py_modules
    assert not dist.py_modules
    assert set(dist.packages) == set(packages)
    # When `py_modules` is given, don't do anything
    dist = Distribution({**attrs, "py_modules": ["explicit_py_module"]})
    dist.set_defaults()
    assert not dist.packages
    assert set(dist.py_modules) == {"explicit_py_module"}
    # When `packages` is given, don't do anything
    dist = Distribution({**attrs, "packages": ["explicit_package"]})
    dist.set_defaults()
    assert not dist.py_modules
    assert set(dist.packages) == {"explicit_package"}


@pytest.mark.parametrize(
    ('dist_name', 'package_dir', 'package_files'),
    [
        ("my.pkg.nested", None, ["my/pkg/nested/__init__.py"]),
        ("my.pkg", None, ["my/pkg/__init__.py", "my/pkg/file.py"]),
        ("my_pkg", None, ["my_pkg.py"]),
        ("my_pkg", None, ["my_pkg/__init__.py", "my_pkg/nested/__init__.py"]),
        ("my_pkg", None, ["src/my_pkg/__init__.py", "src/my_pkg/nested/__init__.py"]),
        (
            "my_pkg",
            {"my_pkg": "lib", "my_pkg.lib2": "lib2"},
            ["lib/__init__.py", "lib/nested/__init__.pyt", "lib2/__init__.py"],
        ),
        # Should not try to guess a name from multiple py_modules/packages
        ("UNKNOWN", None, ["src/mod1.py", "src/mod2.py"]),
        ("UNKNOWN", None, ["src/pkg1/__ini__.py", "src/pkg2/__init__.py"]),
    ],
)
def test_dist_default_name(tmp_path, dist_name, package_dir, package_files):
    """Make sure dist.name is discovered from packages/py_modules"""
    ensure_files(tmp_path, package_files)
    attrs = {
        **EXAMPLE_BASE_INFO,
        "src_root": "/".join(os.path.split(tmp_path)),  # POSIX-style
        "package_dir": package_dir,
    }
    del attrs["name"]

    dist = Distribution(attrs)
    dist.set_defaults()
    assert dist.py_modules or dist.packages
    assert dist.get_name() == dist_name