What types of tests do you know? Have you written tests in practice?

In Go, several types of tests are usually distinguished:

• Unit tests — test individual functions or methods in isolation.
• Integration tests — test the interaction between components.
• End-to-end tests (E2E) — test the entire application, simulating user behavior.
• Benchmark tests — measure code performance.

In practice, I wrote unit tests using the standard testing package. For example:

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

I also used integration tests to verify database and external service interactions, employing mock objects and test environments.