def test_filter_potential_blocks(self):
collation = Collation()
collation.add_plain_witness("W1", "the fox jumps over the fox")
collation.add_plain_witness("w2", "the fox jumps over the dog")
potential_blocks = collation.calculate_potential_blocks()
collation.filter_potential_blocks(potential_blocks)
self.fail("TESTING!")
