resolve() was not tested with a symlink cycle #3513
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This PR adds a test for the resolve() function.
In particular, testing with symlink cycle was not covered
with tests according to codcov:
https://codecov.io/gh/vim/vim/src/2bc152ab53c4b01072edf6ec2ff61e504cb03cbe/src/evalfunc.c#L9657
I put some FIXME comments in the test where resolve() does not behave
as I expected.
I'll remove WIP in the title when CI shows enough code coverage.