How do I unit test functions in the main package?

Testing Functions in the Main Package

When writing unit tests for functions in the main package, it's crucial to understand the appropriate approach to ensure access to these functions during testing.

The provided code snippet showcases a main.go file with functions foo() and main(). To test these functions, a main_test.go file is created with the test function Foo(). However, this approach fails due to the undefined function foo().

The issue lies in the fact that the main package is not importable. To resolve this, when running the go test command, it's essential to specify all relevant files, including both main.go and main_test.go. Additionally, the test function name must start with "Test" and take a pointer to testing.T as an argument.

After making these modifications, running the test will now correctly access the foo() function in main.go and provide the expected test output.

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