Add tests for crash on inference of __len__

[DanielNoord]

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Type of Changes

	Type
✓	🐛 Bug fix

Description

These are the tests for pylint-dev/astroid#1234

This closes #5244

[Pierre-Sassoulas]

Thank you !

[cdce8p]

Not sure this is needed anymore as the test cases I suggested in pylint-dev/astroid#1234 (review) should cover it.

[DanielNoord]

Closing in favour of tests in pylint-dev/astroid#1234.

[Pierre-Sassoulas]

I think adding regression tests in pylint is a nice way to close the pylint issue when the problem is really fixed, right now pylint #5244 is closed but astroid is not upgraded in pylint to 2.8.5 yet so the issue will persist if we release pylint 2.12.0 without upgrading to astroid 2.8.5 first. The cost of running the test in pylint is not very high too.

[DanielNoord]

I have reopened the PR although the names shall have to be updated (numpy was not the main cause of this issue).

[DanielNoord]

Tests have been renamed. Did not add a changelog entry as that really felt unwarranted since 1) the change is really in astroid and 2) no user has reported this other than myself :)

[coveralls]

Pull Request Test Coverage Report for Build 1453677129

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.362%

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Totals
Change from base Build 1452882856:	0.0%
Covered Lines:	13812
Relevant Lines:	14794

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💛 - Coveralls

[cdce8p]

This doesn't test anything anymore. Apparent as all tests pass without the fix.
Either revert the module name change or use the example for the code review (with lambda). This can even be added as a normal functional test as it doesn't depend on the module name.

class MyClass:
    def some_func(self):
        return lambda: 42

    def __len__(self):
        return len(self.some_func())

[DanielNoord]

Updated to actually crash (and be resolved by astroid 2.8.5 again).

[Pierre-Sassoulas]

I just released astroid 2.8.5, would you mind upgrading the version in this PR as it's the one that needs it ? :)

[DanielNoord]

Ah misunderstood you. Added a preceding commit that bumps the version :)

The test were not passing in the latest commit before upgrading to astroid 2.8.5