def METHOD_NAME():
    info = dp3.DPInfo()
    # Check default values.
    assert info.n_channels == 0
    assert info.channel_frequencies == []
    assert info.bda_channel_frequencies == [[]]
    assert info.channel_widths == []
    assert info.bda_channel_widths == [[]]
    # Check that properties are read-only.
    with pytest.raises(AttributeError):
        info.n_channels = 3
    with pytest.raises(AttributeError):
        info.channel_frequencies = [10.0e6, 11.0e6, 12.0e6]
    with pytest.raises(AttributeError):
        info.bda_channel_frequencies = [[13.0e6, 14.0e6, 15.0e6]]
    with pytest.raises(AttributeError):
        info.channel_frequencies = [2.0e6, 2.0e6, 2.0e6]
    with pytest.raises(AttributeError):
        info.bda_channel_frequencies = [[3.0e6, 3.0e6, 3.0e6]]
    # Check that set_channels() yields new property values.
    frequencies = [42.0e6, 43.0e6]
    widths = [1.0e6, 1.0e6]
    info.set_channels(frequencies, widths)
    assert info.n_channels == 2
    assert info.channel_frequencies == frequencies
    assert info.bda_channel_frequencies == [frequencies]
    assert info.channel_widths == widths
    assert info.bda_channel_widths == [widths]