[FEATURE] Add tests for Drifty

[SaptarshiSarkar12]

Is your feature request related to a problem? Please describe.

It is a tedious task to check if Drifty can still download all the supported types of files like YouTube, and Instagram videos and Spotify songs along with general files like https://download.oracle.com/java/22/latest/jdk-22_linux-x64_bin.deb.

Describe the solution you'd like.

Adding multiple separate JUnit tests (I suppose this would suffice; If you think integration testing would be better in some scenario, please let me know) for each download category, batch processing, etc. would be better. Moreover, these tests can then be run on schedule via GitHub Actions allowing automated testing.

Additional information

If anyone wants to work on this issue, please comment below. I would assign this task to you.

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