[FEATURE] Initial setting for unit test

[BECATRUE]

First of all, see also: #83

Feature you want to implement

I want to initiate the unit test for checking completeness.

• Organize unit test system.
• Test for swift.app for checking if the unit test runs well.

How the feature is implemented

Test files location

• In the repository, make a directory name tests.
• In tests directory, there are testing files, e.g. test_swift.py and test_apps.py.
• In each file, there are several classes which are subclasses of unittest.TestCase.

Test for swift.app

• If frames() returns an iterable object.
• If constructor arguments are assigned well.

Additional context

See also: unittest, coverage

[kangz12345]

How are you going to make the unit test system? For example, to create a new directory test or to add a GitHub action, etc.

[BECATRUE]

How are you going to make the unit test system? For example, to create a new directory test or to add a GitHub action, etc.

I updated the descriptions.

My focus is to apply unit test to PyQt system rather than systematizing testing, so why don't we talk about the details later?

[kangz12345]

My focus is to apply unit test to PyQt system rather than systematizing testing, so why don't we talk about the details later?

Good idea, then let's discuss the testing system first, and then come back to here. I think #90 should be closed until we decide the how we test the package.

[BECATRUE]

Okay! I closed #90 and let's discuss it.

[BECATRUE]

I updated the description. Plz check it! @kangz12345