You could inject your dependencies. There is a funny talk by Liron Levin [1] which helped me a lot.
1: https://youtu.be/_B_vCEiO4mA prakash sharma <prakashsharmac...@gmail.com> schrieb am Sa. 11. Jan. 2020 um 16:24: > Need help: > > https://stackoverflow.com/questions/59693971/mocked-method-not-working-in-golang-while-running-the-test-cases > > I am trying to mock an struct method in test cases but it is not working. > I want to mock *Validate* method here: > > package main > > import ( > "fmt" > ) > > type DemoInterface interface { > Inc(int) (int, error) > Validate(int) error > } > type DemoStruct struct{} > > func (l DemoStruct) Inc(num int) (int, error) { > err := l.Validate(num) > if err != nil { > return 0, err > } > num = num + 100 > return num, nil > > } > func (l DemoStruct) Validate(num int) error {// SOME DB LOGIC IS HERE WHICH I > CAN NOT POST at Stackoverflow > if num > 100 { > return fmt.Errorf("INVALID NUM %v", num) > } > return nil > } > > func main() { > s, err := DemoStruct{}.Inc(10) > if err != nil { > fmt.Println(err) > } > fmt.Println(s) > > } > > > > My test cases: > > package main > > import ( > "fmt" > "testing" > ) > > const ( > SUCCESS = "SUCCESS" > ERROR = "ERROR" > ) > > type MockDemoStruct struct { > DemoStruct > functionality string > } > > func (m MockDemoStruct) Validate(num int) error { > switch m.functionality { > case SUCCESS: > return nil > case ERROR: > fmt.Errorf("MOCK ERROR %v", num) > > } > return fmt.Errorf("MOCK ERROR %v", num) > } > > func TestPath(t *testing.T) { > > t.Run("ERROR", func(t *testing.T) { > ls := MockDemoStruct{DemoStruct{}, SUCCESS} > res, err := ls.Inc(110) > expected := fmt.Errorf("MOCK ERROR %v", 10) > if err != expected { > t.Errorf("NOT MATCH %v %v", err, expected) > //-----------------NOT MATCH INVALID NUM 110 MOCK ERROR 10 > ERROR----------------------------- > > } > fmt.Println(res) > }) > } > > > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/a90f9eee-cebb-4d2d-b1cf-76b16faee296%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/a90f9eee-cebb-4d2d-b1cf-76b16faee296%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CALWqRZqfjL0-5ZaSJOywLFaJoebmvh7Mfb%2BsnpGpEE1M6Aj%3D7g%40mail.gmail.com.
