What types of tests do you consider necessary to verify code quality?

To check the quality of Go code, several types of tests are usually used:

• Unit tests — verify individual functions or methods for correctness. They are fast and isolated.
• Integration tests — check the interaction of multiple components or modules together.
• End-to-end tests — simulate the entire application, testing business logic and user scenarios.
• Performance tests (benchmarks) — measure the speed and efficiency of the code.

Example of a simple unit test in Go:

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)
    }
}