Go — Testing

Basic test

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

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

Table-driven tests

func TestAdd(t *testing.T) {
    tests := []struct {
        a, b, want int
    }{
        {1, 2, 3},
        {0, 0, 0},
        {-1, 1, 0},
    }

    for _, tt := range tests {
        if got := Add(tt.a, tt.b); got != tt.want {
            t.Errorf("Add(%d, %d) = %d; want %d", tt.a, tt.b, got, tt.want)
        }
    }
}

Benchmarks

func BenchmarkAdd(b *testing.B) {
    for i := 0; i < b.N; i++ {
        Add(1, 2)
    }
}

Test helpers

func Helper(t *testing.T) {
    t.Helper()
    // Helper function
}

Mini Practice

Write Go code that:

1. Creates a basic test
2. Uses table-driven tests
3. Writes a benchmark
4. Uses test helpers

Up Next

In the next lesson, you'll learn about Packages — organizing Go code.