def test_multiple_numbers(self): self.assertEqual(transform_phone('+12345678901, +23456789012'), ['+12345678901', '+23456789012'])
def test_one_number(self): self.assertEqual(transform_phone('+12345678901'), ['+12345678901'])
def test_empty_string(self): self.assertEqual(transform_phone(''), [])
def test_multiple_numbers(self): self.assertEqual( transform_phone('+12345678901, +23456789012'), ['+12345678901', '+23456789012'] )