test: Add unit test for src/main.rs

[gru-agent-staging]

Trigger Info

Trigger Type	Triggered By	Source File	Assignment
Manual	yMsquare	src/main.rs	Detail

Summary

Added unit tests for the main module to improve code reliability and ensure proper functionality. The following changes were made:

• test_main_with_valid_args: Verifies that Config::build correctly parses valid arguments.

• test_main_with_insufficient_args: Ensures the program panics with an appropriate error message when insufficient arguments are provided.

• test_main_error_handling: Tests error handling when a nonexistent file is passed as an argument.

These tests enhance the robustness of the argument parsing and error handling logic.

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