Add tests using mocker to main.py

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Description

This PR adds tests to the main.py file using the mocker fixture from pytest-mock. The tests cover the initialization and forward method of the Net class, as well as the integration of the Net class with the FastAPI app in the api.py file.

Summary of Changes

• Created a new file named test_main.py in the src directory.
• Imported the necessary modules for testing, including pytest, pytest-mock, and modules from main.py and api.py.
• Added test functions to check the initialization of the Net class, the forward method of the Net class, and the integration of the Net class with the FastAPI app.
• Used the mocker fixture to mock relevant objects and methods in the tests.
• Ensured that the tests cover the functionality of the model and its integration with the API.

Please review and merge this PR. Thank you!

Fixes #10.

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• Rollback changes to src/test_main.py
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