def METHOD_NAME(monkeypatch):
    def mock_check_call(command):
        global clone_dir
        clone_dir = command[-1]
        os.makedirs(os.path.join(clone_dir, "desktop/deb/distribution"))
    monkeypatch.setattr(deb.subprocess, "check_call", mock_check_call)
    def mock_copytree(source_tree, destination_tree):
        global clone_dir
        assert source_tree == mozpath.join(clone_dir, "desktop/deb/distribution")
        assert destination_tree == "/source_dir/firefox/distribution"
    monkeypatch.setattr(deb.shutil, "copytree", mock_copytree)
    deb._inject_deb_distribution_folder("/source_dir", "Firefox")