Audit unittest assert methods (#1736)
I ran the following code in Python 3.10 to automatically generate a list
of enums.
```python
import unittest
print(
",\n".join(
sorted(
m.removeprefix("assert") if m != "assert_" else "Underscore"
for m in dir(unittest.TestCase)
if m.startswith("assert")
)
)
)
```
