How to use the poetry.packages.dependency_from_pep_508 function in poetry

def test_dependency_from_pep_508_with_url():
    name = "django-utils @ https://example.com/django-utils-1.0.0.tar.gz"

    dep = dependency_from_pep_508(name)

    assert "django-utils" == dep.name
    assert dep.is_url()
    assert "https://example.com/django-utils-1.0.0.tar.gz" == dep.url

def test_dependency_python_version_in_comma():
    name = "requests (==2.18.0); python_version in '3.3, 3.4, 3.5'"
    dep = dependency_from_pep_508(name)

    assert dep.name == "requests"
    assert str(dep.constraint) == "2.18.0"
    assert dep.python_versions == "3.3.* || 3.4.* || 3.5.*"
    assert str(dep.marker) == 'python_version in "3.3, 3.4, 3.5"'

def test_dependency_from_pep_508_with_git_url():
    name = "django-utils @ git+ssh://git@corp-gitlab.com/corp-utils.git@1.2"

    dep = dependency_from_pep_508(name)

    assert "django-utils" == dep.name
    assert dep.is_vcs()
    assert "git" == dep.vcs
    assert "ssh://git@corp-gitlab.com/corp-utils.git" == dep.source
    assert "1.2" == dep.reference

def test_dependency_from_pep_508_with_single_python_version():
    name = 'requests (==2.18.0); python_version == "2.7"'
    dep = dependency_from_pep_508(name)

    assert dep.name == "requests"
    assert str(dep.constraint) == "2.18.0"
    assert dep.extras == []
    assert dep.python_versions == "~2.7"
    assert str(dep.marker) == 'python_version == "2.7"'

def test_solver_does_not_trigger_new_resolution_on_duplicate_dependencies_if_only_extras(
    solver, repo, package
):
    dep1 = dependency_from_pep_508('B (>=1.0); extra == "foo"')
    dep1.activate()
    dep2 = dependency_from_pep_508('B (>=2.0); extra == "bar"')
    dep2.activate()

    package.add_dependency("A", {"version": "^1.0", "extras": ["foo", "bar"]})

    package_a = get_package("A", "1.0.0")
    package_a.extras = {"foo": [dep1], "bar": [dep2]}
    package_a.requires.append(dep1)
    package_a.requires.append(dep2)

    package_b2 = get_package("B", "2.0.0")
    package_b1 = get_package("B", "1.0.0")

    repo.add_package(package_a)
    repo.add_package(package_b1)

def test_dependency_with_extra():
    name = "requests[security] (==2.18.0)"
    dep = dependency_from_pep_508(name)

    assert dep.name == "requests"
    assert str(dep.constraint) == "2.18.0"

    assert len(dep.extras) == 1
    assert dep.extras[0] == "security"

if universal_wheel is not None:
                return self._get_info_from_wheel(universal_wheel)

            info = {}
            if universal_python2_wheel and universal_python3_wheel:
                info = self._get_info_from_wheel(universal_python2_wheel)

                py3_info = self._get_info_from_wheel(universal_python3_wheel)
                if py3_info["requires_dist"]:
                    if not info["requires_dist"]:
                        info["requires_dist"] = py3_info["requires_dist"]

                        return info

                    py2_requires_dist = set(
                        dependency_from_pep_508(r).to_pep_508()
                        for r in info["requires_dist"]
                    )
                    py3_requires_dist = set(
                        dependency_from_pep_508(r).to_pep_508()
                        for r in py3_info["requires_dist"]
                    )
                    base_requires_dist = py2_requires_dist & py3_requires_dist
                    py2_only_requires_dist = py2_requires_dist - py3_requires_dist
                    py3_only_requires_dist = py3_requires_dist - py2_requires_dist

                    # Normalizing requires_dist
                    requires_dist = list(base_requires_dist)
                    for requirement in py2_only_requires_dist:
                        dep = dependency_from_pep_508(requirement)
                        dep.marker = dep.marker.intersect(
                            parse_marker("python_version == '2.7'")

if meta.requires_dist:
                    reqs = list(meta.requires_dist)
                else:
                    reqs = []
                    requires = egg_info / "requires.txt"
                    if requires.exists():
                        with requires.open(encoding="utf-8") as f:
                            reqs = parse_requires(f.read())
            finally:
                os.chdir(current_dir)

            package = Package(package_name, package_version)
            package.description = package_summary

            for req in reqs:
                dep = dependency_from_pep_508(req)
                if dep.in_extras:
                    for extra in dep.in_extras:
                        if extra not in package.extras:
                            package.extras[extra] = []

                        package.extras[extra].append(dep)

                if not dep.is_optional():
                    package.requires.append(dep)

            if python_requires:
                package.python_versions = python_requires

        if name and name != package.name:
            # For now, the dependency's name must match the actual package's name
            raise RuntimeError(

)
                    base_requires_dist = py2_requires_dist & py3_requires_dist
                    py2_only_requires_dist = py2_requires_dist - py3_requires_dist
                    py3_only_requires_dist = py3_requires_dist - py2_requires_dist

                    # Normalizing requires_dist
                    requires_dist = list(base_requires_dist)
                    for requirement in py2_only_requires_dist:
                        dep = dependency_from_pep_508(requirement)
                        dep.marker = dep.marker.intersect(
                            parse_marker("python_version == '2.7'")
                        )
                        requires_dist.append(dep.to_pep_508())

                    for requirement in py3_only_requires_dist:
                        dep = dependency_from_pep_508(requirement)
                        dep.marker = dep.marker.intersect(
                            parse_marker("python_version >= '3'")
                        )
                        requires_dist.append(dep.to_pep_508())

                    info["requires_dist"] = sorted(list(set(requires_dist)))

            if info:
                return info

            # Prefer non platform specific wheels
            if universal_python3_wheel:
                return self._get_info_from_wheel(universal_python3_wheel)

            if universal_python2_wheel:
                return self._get_info_from_wheel(universal_python2_wheel)