import ( "testing" "github.com/juju/testing" ) type SomeInterface interface { MethodToBeCalled(string) (string, error) } func TestSomeFunction(t *testing.T) { checker := &testing.Checker{} mocker := &testing.Stub{} interfaceImpl := &SomeInterfaceImpl{} mocker.AddCallback(interfaceImpl) result, err := interfaceImpl.MethodToBeCalled("input") if err != nil { t.Errorf("Unexpected error: %v", err) } if result != "expected result" { t.Errorf("Unexpected result: %v", result) } checker.AssertCalls(mocker.CheckCalls(), []testing.Called{ {"MethodToBeCalled", []interface{}{"input"}, []interface{}{"expected result", nil}}, }) } type SomeInterfaceImpl struct {} func (s *SomeInterfaceImpl) MethodToBeCalled(input string) (string, error) { return "expected result", nil }
import ( "testing" "github.com/juju/testing" ) type SomeInterface interface { MethodToBeCalled(string) (string, error) } func TestSomeFunction(t *testing.T) { checker := &testing.Checker{} mocker := &testing.Stub{} interfaceImpl := &SomeInterfaceImpl{} mocker.AddCallback(interfaceImpl) mock := mocker.NewMock(t) mock.On("MethodToBeCalled", "input").Return("expected result", nil) result, err := interfaceImpl.MethodToBeCalled("input") if err != nil { t.Errorf("Unexpected error: %v", err) } if result != "expected result" { t.Errorf("Unexpected result: %v", result) } mock.AssertExpectations(t) } type SomeInterfaceImpl struct {} func (s *SomeInterfaceImpl) MethodToBeCalled(input string) (string, error) { return "unexpected result", nil }In this example, we also define an interface called "SomeInterface" and create a mock implementation of it with the "Stub" method. However, in this case, we use the "NewMock" method to create a mock object that we can use to set expectations for the "MethodToBeCalled" method. We then call the same function that we want to test, and assert that the "MethodToBeCalled" method was called with the correct parameters and returned the expected result. In summary, the "Stub CheckCalls" method in the "github.com/juju/testing" library is used to create mock interfaces for testing purposes in Go programming language. It allows developers to simulate how different methods of this interface will be called and to set expectations for these calls in order to verify their behavior.