'Add each registered transformer to the block structure.
Mimic collection by setting test transformer block data.'

def add_transformers(self):

    for transformer in [MockTransformer]:
        self.block_structure._add_transformer(transformer)
        self.block_structure.set_transformer_block_field(self.block_key_factory(0), transformer, key='test', value='{}    val'.format(transformer.name()))
