test_metadata.py 文件源码

def test_append_metadata_file(tmpdir):
    initial_data = 'some data'
    my_metadata = {
        'some': 'data',
        'for': 'this metadata'
    }
    output_file = tmpdir.join('metadata')
    output_file.write_binary((initial_data + os.linesep).encode('utf-8'))

    with metadata.MetadataWriter(suppress_output=False)(str(output_file)) as writer:
        writer.write_metadata(**my_metadata)

    lines = output_file.readlines()
    assert len(lines) == 2
    assert lines[0].strip() == initial_data
    assert json.loads(lines[1].strip()) == my_metadata