'Verifies the value for each block in the given structure, for the given
data key.'

@classmethod
def _assert_block_values(cls, block_structure, data_key):

    for block_key in block_structure.topological_traversal():
        assert (block_structure.get_transformer_block_field(block_key, cls, data_key) == cls._create_block_value(block_key, data_key))
