Hands-On Dependency Injection in Go

Testability

Despite being a small and working service, we have quite a few issues, perhaps the most egregious of which is its difficulty to test. Now, we don't want to start introducing test-induced damage, but we do want to have a system that we are confident in. To achieve this, we are going to need to reduce the complexity and verbosity of the tests. Take a look at the following test:

func TestGetHandler_ServeHTTP(t *testing.T) {   // ensure the test always fails by giving it a timeout   ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)   defer cancel()     // Create and start a server  // With out current implementation, we cannot test this handler   // without a full server as we need the mux. address, err := startServer(ctx) ...