我正在測驗一個應用程式，其中一個方法創建和物件，并且我正在嘗試測驗該物件實際上是這樣創建的：
@Test
public void testCreateWagerGetsCreated(){
DefaultSportsBettingService service = mock(DefaultSportsBettingService.class);
Player player = mock(Player.class);
Outcome outcome = new Outcome(null,"description",BigDecimal.valueOf(2),false);
BigDecimal bd = BigDecimal.valueOf(100);
assertNotNull(service.createWager(player,outcome, bd));
}
但是測驗失敗并拋出此錯誤：
org.opentest4j.AssertionFailedError: expected: not <null>
at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:39)
at org.junit.jupiter.api.Assertions.fail(Assertions.java:134)
at org.junit.jupiter.api.AssertNotNull.failNull(AssertNotNull.java:47)
at org.junit.jupiter.api.AssertNotNull.assertNotNull(AssertNotNull.java:36)
at org.junit.jupiter.api.AssertNotNull.assertNotNull(AssertNotNull.java:31)
at org.junit.jupiter.api.Assertions.assertNotNull(Assertions.java:300)
at com.epam.training.sportsbetting.Tester.testCreateWagerGetsCreated(Tester.java:64)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
我嘗試模擬域類并實體化它們，兩者都拋出相同的錯誤。我究竟做錯了什么？
球員等級：
public class Player extends User{
private String name;
private BigDecimal balance;
private Currency currency;
public Player(){
}
public Player(String email, String password, String name, BigDecimal balance, Currency currency) {
super(email, password);
this.name = name;
this.balance = balance;
this.currency = currency;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public BigDecimal getBalance() {
return balance;
}
public void setBalance(BigDecimal balance) {
this.balance = balance;
}
public Currency getCurrency() {
return currency;
}
public void setCurrency(Currency currency) {
this.currency = currency;
}
@Override
public String toString() {
return "Player{"
"name='" name '\''
", balance=" balance
", currency=" currency
'}';
}
}
DefaultSportsBettingService 類：
public class DefaultSportsBettingService implements SportsBettingService{
public DummyDataStore dds = new DummyDataStore();
public List <Player> initializedPlayers = dds.getPlayerDatastore();
public List<User> initializedUsers = dds.getUserDataStore();
public List<Outcome> outcomeDatastore = dds.getOutcomeDatastore();
public List<SportEvent> sportEventDataStore = dds.getSportEventDataStore();
public List<Wager> wagerDatastore = dds.getWagerDatastore();
public List<Bet> betsDataStore = dds.getBetDataStore();
Player loggedPlayer;
@Override
public Player authenticateUser(User login) throws AuthenticationException {
Player find = new Player();
for (Player player : initializedPlayers) {
if (login.getEmail().equals(player.getEmail()) && login.getPassword().equals(player.getPassword())) {
loggedPlayer = player;
return loggedPlayer;
}
}
throw new AuthenticationException("Incorrect email and/or password");
}
@Override
public List<Bet> findAllBets() {
return dds.findAllBetVariations();
}
@Override
public Wager createWager(Player player, Outcome outcome, BigDecimal amount) throws LowBalanceException {
Wager wager = new Wager();
wager.setOutcome(outcome);
wager.setPlayer(player);
wager.setCurrency(player.getCurrency());
wager.setTimeStampCreated(LocalDateTime.now());
wager.setAmount(amount);
if(getLoggedPlayer().getBalance().compareTo(amount) < 0){
throw new LowBalanceException(loggedPlayer.getBalance().toString(), loggedPlayer.getCurrency());
}
getLoggedPlayer().setBalance(getLoggedPlayer().getBalance().subtract(amount));
if(wager.getOutcome().isWin()){
wager.setWin(true);
}
wagerDatastore.add(wager);
return wager;
}
@Override
public List<Wager> findAllWagers() {
return wagerDatastore;
}
@Override
public void calculateResults() {
BigDecimal counter = BigDecimal.valueOf(0);
for(int i = 0; i < wagerDatastore.size(); i ){
if(wagerDatastore.get(i).isWin()){
counter = counter.add(wagerDatastore.get(i).getOutcome().getOdd().multiply(wagerDatastore.get(i).getAmount()));
wagerDatastore.get(i).getPlayer().setBalance(counter);
}
}
}
public Player getLoggedPlayer() {
return loggedPlayer;
}
public void setLoggedPlayer(Player loggedPlayer) {
this.loggedPlayer = loggedPlayer;
}
}
uj5u.com熱心網友回復：
幾個問題加在一起了。
DefaultSportsBettingService是一個正在測驗的物件，所以你不想模擬它。在您的情況下
NullPointerException，getLoggedPlayer從未loggerPlayer初始化過。
使測驗變得糟糕的幾個不太重要的事情：
LocalDateTime.now()是靜態的，因此您無法測驗它是否設定正確，因此最好將其作為外部引數傳遞（超出這些答案的范圍）
近似解決方案可能如下所示（無法在 IDE 中測驗）：
@ExtendWith(MockitoExtension.class)
class DefaultSportsBettingServiceTest {
@Mock
Player loggedPlayer
@InjectMocks
DefaultSportsBettingService service
@Test
public void testCreateWagerGetsCreated(){
Mockito.when(loggedPlayer.getBalance()).thenReturn(BigDecimal.ZERO);
Mockito.doNothing().when(loggedPlayer).setBalance(BigDecimal(15));
Player player = Player(); // May require more params
Outcome outcome = new Outcome(null,"description",BigDecimal.valueOf(2),false);
BigDecimal bd = BigDecimal.valueOf(100);
assertNotNull(service.createWager(player,outcome, bd));
}
}
基本上，您將模擬loggedPlayer和休息作為普通物件傳遞并期望其service.createWager正常作業。從這里 Mockito 應該建議您是否需要進行其他更正來測驗代碼或測驗值。
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