def test_digits(): assert like_number('10') assert like_number('1')
def test_not_number(): assert not like_number('dog') assert not like_number(',')
def test_word(): assert like_number('one') assert like_number('two') assert like_number('billion')
def test_fraction(): assert like_number('1/2') assert not like_number('1/2/3')
def test_period(): assert like_number('999.0') assert like_number('.99')
def test_comma(): assert like_number('10,000') assert like_number('10,00') assert like_number(',10')