Can we change this to having only one assertEquals? Because if the first assertion fails you have no information about whether the later assertions fail or succeed.

Maybe something like:

```python
self.assertEquals(
    [Decimal('1.55'),
     Decimal('0.01'),
     Decimal('6.66666')],

    [deserialize_decimals(serialize_decimals(Decimal('1.55'))),
     deserialize_decimals(serialize_decimals(Decimal('0.01'))),
     deserialize_decimals(serialize_decimals(Decimal('6.66666')))])
```

Although this has more duplication I think it is more expressive than looping