Add unit tests for internal/config package

[sweep-ai[bot]]

This pull request was created by Sweep to resolve the following request by @harperreed:

Add unit tests for internal/config package

Definition of Complete

• New test file internal/config/config_test.go is created
• Unit tests cover all functions in internal/config/config.go
• All tests pass successfully

What Should be Done

1. Create a new file internal/config/config_test.go
2. Write test cases for the Load() function in internal/config/config.go
   • Test successful config loading
   • Test error handling for non-existent config file
   • Test error handling for invalid JSON in config file
3. Ensure proper test coverage for the Config struct
4. Update go.mod if any new testing dependencies are required
5. Run tests to verify they pass successfully

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Purpose

This pull request adds unit tests for the internal/config package to ensure the proper functioning of the Load() function and the Config struct.

Description

The changes in this pull request include:

1. Creating a new file internal/config/config_test.go to add the unit tests.
2. Implementing test cases for the Load() function:
   • Successful config loading
   • Error handling for non-existent config file
   • Error handling for invalid JSON in config file
3. Ensuring proper test coverage for the Config struct, including JSON marshaling and unmarshaling.
4. Updating go.mod to include the github.com/stretchr/testify/assert dependency for more expressive assertions.
5. Running tests to verify they pass successfully.

Summary

• New file internal/config/config_test.go is created
• Unit tests cover all functions in internal/config/config.go
• All tests pass successfully

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