you don't need `+` at the end of strings within parentheses. This long line can just appear as

```
expected = (u' 2\na  \x1b[94m\x1b[1mn_x\x1b[0;0m\x1b[0;0m\u2a02 \x1b[94m'
u'\x1b[1mn_y\x1b[0;0m\x1b[0;0m + b \x1b[94m\x1b[1mn_y\x1b[0;0'
u'm\x1b[0;0m\u2a02 \x1b[94m\x1b[1mn_y\x1b[0;0m\x1b[0;0m + c'
u'\u22c5sin(\u03b1) \x1b[94m\x1b[1mn_z\x1b[0;0m\x1b[0;0m'
u'\u2a02 \x1b[94m\x1b[1mn_y\x1b[0;0m\x1b[0;0m')
```