'All find_all calls return a ResultSet'

def test_find_all_resultset(self):

    soup = self.soup('<a></a>')
    result = soup.find_all('a')
    self.assertTrue(hasattr(result, 'source'))
    result = soup.find_all(True)
    self.assertTrue(hasattr(result, 'source'))
    result = soup.find_all(text='foo')
    self.assertTrue(hasattr(result, 'source'))
