doNothing when on abstract class method but should work when called from concreate class instance

Question

I have following structure:

class Sample {
 private Map<String A> serviceMap;

 @Autowired
 private List<A> services;

 @PostConstruct
 public void init() {
  this.serviceMap = this.services.stream().collect(Collectors.toMap(A::getName, s -> s)); 
 }

 public void doSomething() {
   // Some logic, and gets the serviceName
   this.serviceMap.get(serviceName).process(...);
 }
}

Now how to test this doSomething method of Sample class. I don't want to call the process method of Abstract class A.

I tried to MockBean the services but the problem is how to use doNothing when for this line this.serviceMap.get(serviceName).process(...);.

Answer 1

You can add a getter function for serviceMap. The getter will be package-private for testing purposes.

class Sample {
 private Map<String A> serviceMap;

 @Autowired
 private List<A> services;

 @PostConstruct
 public void init {
  this.serviceMap = this.services.stream().collect(Collectors.toMap(A::getName, s -> s)); 
 }

 public void doSomething {
   // Some logic, and gets the serviceName
   getServiceMap().get(serviceName).process(...);
 }

 Map<String A> getServiceMap(){
   return this.serviceMap;
 }
}

Then in your test -

//Given
var sampleSpy = spy(Sample.class);
var serviceMapMock = mock(Map.class);
var serviceAMock = mock(A.class);
when(sampleSpy.getServiceMap()).thenReturn(serviceMapMock);
when(serviceMapMock.get(any())).thenReturn(serviceAMock);
doNothing().when(serviceAMock).process();

//When
sample.doSomething();

//Then
//assertions