测试我的MVP演示者的最佳方法是什么？我已经阅读了大量的教程，每个教程都让我更加困惑。我刚刚开始学习测试，我认为从演示者开始会比较容易。
我的主持人
public class HymnPresenter implements HymnPresenterContract, HymnRepository.HymnsCallback{
private HymnRepository hymnRepository;
private HymnsViewContract hymnViewContract;
public HymnPresenter() {
}
/*public HymnPresenter(HymnRepository repository, HymnsViewContract viewContract) {
this.hymnViewContract = viewContract;
this.hymnRepository = repository.attach(this);
}*/
@Override
public void addHymns(ArrayList<Hymn> hymns){
if(hymns != null && !hymns.isEmpty()) {
hymnRepository.addHymns(hymns);
hymnViewContract.showLoading();
}else{
handleError("Can not add null hymn");
}
}
@Override
public void addHymn(Hymn hymn){
if(hymn != null) {
hymnViewContract.showLoading();
hymnRepository.addHymn(hymn);
}else{
handleError("Can not add null hymn");
}
}
@Override
public void handleSuccess() {
hymnViewContract.success();
hymnViewContract.hideLoading();
}
@Override
public void handleError(String error) {
hymnViewContract.error(error);
hymnViewContract.hideLoading();
}
}
我的存储库 我正在使用Firebase Firestore数据库存储赞美诗
public class HymnRepository implements HymnPresenterContract{
private HymnsCallback hymnsCallback;
private CollectionReference collectionReference;
private FirebaseFirestore db;
public HymnRepository(FirebaseFirestore database, @HymnCollection CollectionReference collection) {
this.db = database;
this.collectionReference = collection;
}
public HymnRepository attach(@NonNull HymnsCallback callback){
this.hymnsCallback = callback;
return this;
}
@Override
public void addHymns(ArrayList<Hymn> hymns){
WriteBatch batch = db.batch();
for(int i = 0; i < hymns.size(); i++){
batch.set(collectionReference.document(), hymns.get(i));
}
batch.commit()
.addOnSuccessListener(documentReference -> hymnsCallback.handleSuccess())
.addOnFailureListener(e -> hymnsCallback.handleError(e.toString()));
}
@Override
public void addHymn(Hymn hymn) {
collectionReference.add(hymn)
.addOnSuccessListener(documentReference -> hymnsCallback.handleSuccess())
.addOnFailureListener(e -> hymnsCallback.handleError(e.toString()));
}
public interface HymnsCallback {
void handleSuccess();
void handleError(String error);
}
}
我的主持人合同
public interface HymnPresenterContract {
void addHymns(ArrayList<Hymn> hymns);
void addHymn(Hymn hymn);
}
我的观看合同
public interface HymnsViewContract {
void success();
void error(String error);
}
因此，我设法使其正常工作。非常感谢大家……这就是我所做的。
@RunWith(MockitoJUnitRunner.Silent.class)
public class HymnPresenterTest {
@InjectMocks
public HymnPresenter hymnPresenter;
@Mock
public HymnRepository hymnRepository;
@Mock
public HymnsViewContract hymnsViewContract;
@Mock
private Hymn hymn;
ArrayList<Hymn> hymns;
@Before
public void setUp() throws Exception {
hymns = new ArrayList<>();
hymns.add(hymn);
}
@Test
public void addHymn_callsRepositoryAddHymn() throws Exception {
hymnPresenter.addHymn(hymn);
verify(hymnRepository).addHymn(eq(hymn));
}
@Test
public void addHymns_callsRepositoryAddHymns() throws Exception {
hymnPresenter.addHymns(hymns);
verify(hymnRepository).addHymns(eq(hymns));
}
@Test
public void addHymns_callsViewContractShowLoading() throws Exception {
hymnPresenter.addHymns(hymns);
verify(hymnsViewContract).showLoading();
}
@Test
public void addHymn_callsViewContractShowLoading() throws Exception {
hymnPresenter.addHymn(hymn);
verify(hymnsViewContract).showLoading();
}
@Test
public void addNullHymn_callsViewContractError() throws Exception {
hymnPresenter.addHymn(null);
verify(hymnsViewContract).error(anyString());
verify(hymnsViewContract).hideLoading();
}
@Test
public void addEmptyHymnList_callsViewContractError() throws Exception {
ArrayList<Hymn> list = new ArrayList<>();
hymnPresenter.addHymns(list);
verify(hymnsViewContract).error(anyString());
verify(hymnsViewContract).hideLoading();
}
@Test
public void addNonNullHymn_callsViewContractSuccess() throws Exception {
doAnswer(invocation -> {hymnPresenter.handleSuccess();
return null;}).when(hymnRepository).addHymn(any(Hymn.class));
hymnPresenter.addHymn(hymn);
verify(hymnsViewContract).success();
verify(hymnsViewContract).hideLoading();
}
}
现在，当我取消对HymnPresenter构造函数的注释时，几乎所有测试都将失败。
java.lang.NullPointerException
at com.ogotera.gusiihymnal.presenter.HymnPresenter.addHymn(HymnPresenter.java:43)
at com.ogotera.gusiihymnal.presenter.HymnPresenterTest.addHymn_callsViewContractShowLoading(HymnPresenterTest.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:79)
at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:85)
at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)
可能是什么问题？