How to handle B015 within pytest.raises blocks

[jvavrek]

Often when defining custom objects we end up testing that the __eq__ raises a particular error for unsupported comparisons. In practice, this means we have an unused comparison that triggers the B015 rule—see the MWE below. I wonder if there's a recommended way to get around this (without suppressing B015 altogether), or whether it could say be disabled within a with pytest.raises context.

Minimal working example:

# B015.py
import pytest


class MyClass:
    def __init__(self, x):
        self.x = x

    def __eq__(self, other):
        if not isinstance(other, MyClass):
            raise TypeError(f"Cannot compare with {type(other)}")
        return self.x == other.x


a = MyClass(5)
b = MyClass(5)
c = MyClass(4)

assert a == b
assert a != c
with pytest.raises(TypeError):
    a == a.x

$ flake8 B015.py 
B015.py:21:5: B015 Result of comparison is not used. This line doesn't do anything. Did you intend to prepend it with assert?