@Before
public void setup() throws NoSuchFieldException, IllegalAccessException {
initMocks(this);
// injecting Population mock
Field inj = GAPipeline.class.getDeclaredField("population");
inj.setAccessible(true);
inj.set(gaPipeline, population);
inj.setAccessible(false);
gaPipeline.setChoosePairsStrategy(choosePairsStrategy);
gaPipeline.setCrossoverStrategy(crossoverStrategy);
gaPipeline.setMutationStrategy(mutationStrategy);
gaPipeline.setSelectionStrategy(selectionStrategy);
// We add 2 elements to makePairs() return,
// so crossoverStrategy.crossover() should be invoked 2 times
Set<Couple> crossoverStub = new HashSet<Couple>();
crossoverStub.add(Couple.ofCouple(1, 2));
crossoverStub.add(Couple.ofCouple(1, 3));
// Init strategies
when(choosePairsStrategy.choosePairs(Matchers.<Population>any())).thenReturn(crossoverStub);
when(crossoverStrategy.crossover(Matchers.<net.wintermuse.util.Pair>any()))
.thenReturn(mock(Pair.class));
when(mutationStrategy.mutate(any())).thenReturn(mock(Object.class));
when(selectionStrategy.select(Matchers.<Population>any())).thenReturn(mock(Population.class));
}
@Test
public void process_AllStrategiesFired() {
gaPipeline.process();
verify(choosePairsStrategy, times(1)).choosePairs(Matchers.<Population>any());
verify(crossoverStrategy, times(2)).crossover(Matchers.<net.wintermuse.util.Pair>any());
verify(selectionStrategy, times(1)).select(Matchers.<Population>any());
}
@Test(expected = NullPointerException.class)
public void setPopulation_CollectionNull_ThrowNPE() {
Population testPopulation = null;
gaPipeline.setPopulation(testPopulation);
}
@Test(expected = NullPointerException.class)
public void setChoosePairsStrategy_Null_ThrowNPE() {
gaPipeline.setChoosePairsStrategy(null);
}
