Add tests using mocker to main.py

[sweep-nightly]

Description

This PR adds tests to the main.py file using a mocker. The tests cover the data loading and preprocessing steps, as well as the model definition. The purpose of these tests is to ensure that the code in main.py is working as expected.

Summary of Changes

• Created a new test file named test_main.py in the src directory.
• Imported the necessary modules for testing, including pytest, mock, torch, torchvision, and the functions and classes from main.py.
• Added test functions for the data loading and preprocessing steps. Used the mock.patch decorator to replace the DataLoader with a mock object. Checked that the mock DataLoader was called with the correct arguments.
• Added a test function for the model definition. Used the mock.patch decorator to replace the model with a mock object. Checked that the mock model was called with the correct arguments.
• Added docstrings and comments to the test functions, explaining what they are testing and how they are doing it.

Please review and merge this PR to ensure the correctness of the code in main.py and improve the overall test coverage.

Fixes #10.

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Rollback Files For Sweep

• Rollback changes to src/test_main.py
• Rollback changes to src/test_main.py

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