clenaup openapi_parser_parse_alias test

[FlorianLudwig]

cleaning up the test for better readability, especially on test failure.

[codecov]

Codecov Report

Merging #159 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #159   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          916       916           
  Branches       187       187           
=========================================
  Hits           916       916           

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[koxudaxi]

@FlorianLudwig

Thank you very much.

We may have to refactor all tests for better readability.
It may be an answer to write expected data in files.

How do you think?
example:
https://github.com/koxudaxi/fastapi-code-generator/blob/983c0bcb8978969a591bab242fbb6bcfa3c8e039/tests/test_generate.py

[FlorianLudwig]

@koxudaxi
I like the idea of write expected data in files!

It might be a good chance to cleanup the tests overall - there seem to be quite a few tests testing the same thing.

One obvious example would be the test_main and test_main_kr. I think the test_main can be deleted as all tests are in the test_main_kr as well.

[koxudaxi]

Thank you
I have created a new issue.

#160