How to use the pybuilder.core.RequirementsFile function in pybuilder

def test_requirements_file_should_not_be_equal_to_dependency(self):
        dependency = Dependency("foo")
        requirements = RequirementsFile("requirements.txt")

        self.assertFalse(dependency == requirements)

def test_requirements_file_should_be_lesser_than_other_when_name_is_lesser(self):
        requirements_file = RequirementsFile("requirements.txt")
        dev_requirements_file = RequirementsFile("requirements-dev.txt")
        self.assertTrue(requirements_file > dev_requirements_file)

def test_requirements_file_should_not_be_equal_to_dependency_even_when_name_matches(self):
        dependency = Dependency("foo")
        requirements = RequirementsFile("foo")

        self.assertFalse(dependency == requirements)

def test_requirements_file_should_not_be_equal_to_other_when_names_differ(self):
        requirements_file = RequirementsFile("requirements.txt")
        dev_requirements_file = RequirementsFile("requirements-dev.txt")
        self.assertFalse(requirements_file == dev_requirements_file)

def test_requirements_file_should_be_unequal_to_other_when_names_differ(self):
        requirements_file = RequirementsFile("requirements.txt")
        dev_requirements_file = RequirementsFile("requirements-dev.txt")
        self.assertTrue(requirements_file != dev_requirements_file)

def test_requirements_file_should_be_equal_to_itself(self):
        requirements_file = RequirementsFile("requirements.txt")
        self.assertTrue(requirements_file == requirements_file)

def test_requirements_file_should_be_unequal_to_dependency_even_when_name_matches(self):
        dependency = Dependency("foo")
        requirements = RequirementsFile("foo")

        self.assertTrue(dependency != requirements)

def test_requirements_file_should_be_unequal_to_other_when_names_differ(self):
        requirements_file = RequirementsFile("requirements.txt")
        dev_requirements_file = RequirementsFile("requirements-dev.txt")
        self.assertTrue(requirements_file != dev_requirements_file)

def build_dependency_links_string(project):
    dependency_links = [
        dependency for dependency in project.dependencies
        if isinstance(dependency, Dependency) and dependency.url]
    requirements = [
        requirement for requirement in project.dependencies
        if isinstance(requirement, RequirementsFile)]

    editable_links_from_requirements = []
    for requirement in requirements:
        editables = [editable for editable in flatten_and_quote(requirement) if is_editable_requirement(editable)]
        editable_links_from_requirements.extend(
            [editable.replace("--editable ", "").replace("-e ", "") for editable in editables])

    if not dependency_links and not requirements:
        return "[]"

    def format_single_dependency(dependency):
        return '%s' % dependency.url

    all_dependency_links = [link for link in map(format_single_dependency, dependency_links)]
    all_dependency_links.extend(editable_links_from_requirements)

def normalize_dependency_package(mixed):
        if isinstance(mixed, RequirementsFile):
            return None
        if isinstance(mixed, Dependency):
            if mixed.url:
                return None
            return mixed.name
        else:
            return mixed