When generating API stubs with the scaffold utility using, e.g., `python -m localstack.aws.scaffold sns`,
the scaffold creates method names from operation names, which are ugly when acronyms (subsequent uppercase characters that belong together).

Example:
`CreateSMSSandboxPhoneNumber` -> `create_s_m_s_sandbox_phone_number`

it would be nicer to have `create_sms_sandbox_phone_number`

This is a limitation of this method: https://github.com/localstack/localstack/blob/1888e66b85d7e6a8ee457bc7a732984fcf7aa830/localstack/utils/common.py#L978-L979
def test_disk_usage(self, tmp_path):
        f1 = tmp_path / "f1.blob"
        f1.write_bytes(b"0" * 100)
        f2 = tmp_path / "f2.blob"
        f2.write_bytes(b"0" * 100)
        
        f3_dir = tmp_path / "foo"
        f3_dir.mkdir()
        f3 = f3_dir / "f3.blob"
        f3.write_bytes(b"0" * 100)
        
        assert common.disk_usage(tmp_path) == pytest.approx(300, abs=5)
        assert common.disk_usage(f3_dir) == pytest.approx(100, abs=5)
        
        assert common.disk_usage(f3) == pytest.approx(100, abs=5)
        
        assert common.disk_usage(tmp_path / "not_in_path") == 0
        
        with pytest.raises(TypeError):
            assert common.disk_usage(None) == 0
    def test_replace_in_file(self, tmp_path):