Feat: Add test files for swiggy module

[Santhosh-Siddhardha]

Describe the feature

• Test all the methods of the swiggy module and add a test file.
• Will add test file in directory src/test.
• Will Check the swiggy.py file as a reference to get an idea about structuring the code.
• Will use unittest only.

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• [X] I agree to follow this project's Code of Conduct
• [X] I'm a GSSoC'24 contributor
• [X] I want to work on this issue

[nikhil25803]

Go ahead @Santhosh-Siddhardha

• Add test file in directory src/test.
• Use unittest only.