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If you pass a frame object belonging to a class into findsource, it'll incorrectly give you the starting line number of the first function above it or 0 if no functions are defined.
Here's some code to reproduce the issue:
import inspect
def test_func():
 ... # This should not get printed
class Test:
 frame = inspect.currentframe()
print(inspect.getsource(Test.frame)) # Depends on findsource
This unexpectedly prints the source of test_func instead of the class right below it.

Seems there is a related open issue with a similar regex based solution proposed for another class definition related issue : https://bugs.python.org/issue22355#msg226538 . I think it's worth converting the example code reported in issue22355 as unit test cases. Since this issue already has a PR with tests then we can proceed further on this.
Thanks for the report!

Added the requested test cases. They aren't an exact match but they should serve the same purpose.