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whydoesntgowork.go
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| package main | |
| import ("fmt") | |
| // Real A (I cannot change this) | |
| type RealA struct{} | |
| func NewRealA() *RealA { return &RealA{} } | |
| func (a *RealA) M() string { return "real a" } | |
| // Fake A (I can change this) | |
| type FakeA struct{} | |
| func NewFakeA() *FakeA { return &FakeA{} } | |
| func (a *FakeA) M() string { return "fake a" } | |
| // interface for either Real or Fake A (I can change this) | |
| type returnValue interface{ M() string } | |
| type someFunc = func() returnValue | |
| // fn that takes conceptually the Real A, but in tests, the Fake A (I can change this) | |
| func greet(constructIt someFunc) string { return constructIt().M() } | |
| // call it (I can change this) | |
| func main() { | |
| fmt.Println(greet(NewRealA)) | |
| fmt.Println(greet(NewFakeA)) | |
| } |
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