def METHOD_NAME(self):
    """Save then read a BraggVectors instance, and compare contents before/after"""
    braggvectors = self.test_braggvectors_instantiation()
    assert isinstance(braggvectors, BraggVectors)
    # save then read
    save(path_h5, braggvectors, mode="o")
    new_braggvectors = read(path_h5)
    # check it's the same
    assert isinstance(new_braggvectors, BraggVectors)
    assert new_braggvectors is not braggvectors
    for x in range(new_braggvectors.shape[0]):
        for y in range(new_braggvectors.shape[1]):
            assert array_equal(
                new_braggvectors._v_uncal[x, y].data,
                braggvectors._v_uncal[x, y].data,
            )