How do you feel about testing? Why are tests necessary?

Testing is an integral part of development, especially at the senior level. It ensures that the code works correctly, prevents regressions, and facilitates refactoring.

Tests are needed for:

• Checking business logic and function correctness.
• Ensuring stability during changes.
• Documenting code behavior.
• Automating checks in CI/CD.

In Go, it is convenient to use the built-in testing package for writing unit tests. For example:

func Add(a, b int) int {
    return a + b
}

func TestAdd(t *testing.T) {
    result := Add(2, 3)
    if result != 5 {
        t.Errorf("expected 5, got %d", result)
    }
}

This approach helps quickly identify errors and maintain high code quality.