Refactor existing tox test to pytest

[MoonJeWoong]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

In our current project, we are using TOX to run tests. However, the tests are not directly detecting and validating error situations, but using loggers to output the results to the console window and requiring human verification. This method has the disadvantage that it is difficult to recognize when an error occurs.

Therefore, we need to refactor the existing test code with TOX to automatically validate the results using PYTEST and easily check whether an error occurs.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Refactor existing tox test files to pytest code.