Hands-On Dependency Injection in Go

What should I test?

I wish I had a clear, quantifiable metric to give you as to what you should and should not test, but it's just not that clear. The first rule is definitely as follows:

Don't test code that is too simple break.

This includes language features, such as those shown in the following code:

func NewPet(name string) *Pet {   return &Pet{      Name: name,   }}func TestLanguageFeatures(t *testing.T) {   petFish := NewPet("Goldie")   assert.IsType(t, &Pet{}, petFish)}

This also includes simple functions, as shown in the following code:

func concat(a, b string) string {   return a + b}func TestTooSimple(t *testing.T) {   a := "Hello "   b := "World"   expected := "Hello World"   assert.Equal(t, expected, concat(a, b))}

After that, be pragmatic. We get ...