Change test_warningschecker_twice to a unittest
Change test_warningschecker_twice to a unittest

Akasurde/pytest,alfredodeza/pytest,RonnyPfannschmidt/pytest,The-Compiler/pytest,hackebrot/pytest,tomviner/pytest,tomviner/pytest,nicoddemus/pytest,markshao/pytest,pytest-dev/pytest,nicoddemus/pytest,The-Compiler/pytest