How to use the flit.init.IniterBase function in flit

def test_guess_module_name():
    with make_dir(['foo.py', 'foo-bar.py', 'test_foo.py', 'setup.py']) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() == 'foo'

    with make_dir(['baz/__init__.py', 'tests/__init__.py'], ['baz', 'tests']) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() == 'baz'

    with make_dir(['src/foo.py', 'src/foo-bar.py', 'test_foo.py', 'setup.py'],
                  ['src',]) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() == 'foo'

    with make_dir(['src/baz/__init__.py', 'tests/__init__.py'], ['src', 'src/baz', 'tests']) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() == 'baz'

    with make_dir(['foo.py', 'bar.py']) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() is None

    with make_dir(['src/foo.py', 'src/bar.py'], ['src']) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() is None

def test_write_license():
    with TemporaryDirectory() as td:
        ib = init.IniterBase(td)
        ib.write_license('mit', 'Thomas Kluyver')
        assert_isfile(Path(td, 'LICENSE'))

with make_dir(['src/foo.py', 'src/foo-bar.py', 'test_foo.py', 'setup.py'],
                  ['src',]) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() == 'foo'

    with make_dir(['src/baz/__init__.py', 'tests/__init__.py'], ['src', 'src/baz', 'tests']) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() == 'baz'

    with make_dir(['foo.py', 'bar.py']) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() is None

    with make_dir(['src/foo.py', 'src/bar.py'], ['src']) as td:
        ib = init.IniterBase(td)
        assert ib.guess_module_name() is None

if any(new_defaults[k] != self.defaults.get(k) for k in new_defaults):
            self.defaults.update(new_defaults)
            store_defaults(self.defaults)

    def write_license(self, name, author):
        if (self.directory / 'LICENSE').exists():
            return
        year = date.today().year
        with (license_templates_dir / name).open(encoding='utf-8') as f:
            license_text = f.read()

        with (self.directory / 'LICENSE').open('w', encoding='utf-8') as f:
            f.write(license_text.format(year=year, author=author))


class TerminalIniter(IniterBase):
    def prompt_text(self, prompt, default, validator, retry_msg="Try again."):
        if default is not None:
            p = "{} [{}]: ".format(prompt, default)
        else:
            p = prompt + ': '
        while True:
            response = input(p)
            if response == '' and default is not None:
                response = default
            if validator(response):
                return response

            print(retry_msg)

    def prompt_options(self, prompt, options, default=None):
        default_ix = None