Question

java.lang.NullPointerException at com.Accounts.Account.deposit（Account.java:14）at feature.PrintStatementFeature.print_statement_containing_all_transactions（PrintStatementFeature.java:30） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（未知来源）at sun.reflect.DelegatingMethodAccessorImpl.invoke（未知来源）at java.lang.reflect.Method.invoke（未知来源）at org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall（FrameworkMethod.java:50）在 org.junit.internal.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12）在 org.junit.runners.model.FrameworkMethod.invokeExplosively（FrameworkMethod.java:47）在 org.junit.internal.runners.statements.InvokeMethod.evaluate（InvokeMethod.java:17）在 org.junit.internal.runners.statements.RunBefores.evaluate（RunBefores.java:26）在org.junit.runners.ParentRunner.runLeaf（ParentRunner.java:325）at org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:78）在 org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:57）在org.junit.runners.ParentRunner $ 3.run（ParentRunner.java:290）at at org.junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:71）at at org.junit.runners.ParentRunner.runChildren（ParentRunner.java:288）at at org.junit.runners.ParentRunner.access $ 000（ParentRunner.java:58）at at org.junit.runners.ParentRunner $ 2.evaluate（ParentRunner.java:268）at at org.junit.runners.ParentRunner.run（ParentRunner.java:363）at at org.mockito.internal.runners.DefaultInternalRunner $ 1.run（DefaultInternalRunner.java:68）在 org.mockito.internal.runners.DefaultInternalRunner.run（DefaultInternalRunner.java:74）在 org.mockito.internal.runners.StrictRunner.run（StrictRunner.java:39）在 org.mockito.junit.MockitoJUnitRunner.run（MockitoJUnitRunner.java:161）在 org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run（JUnit4TestReference.java:86）在 org.eclipse.jdt.internal.junit.runner.TestExecution.run（TestExecution.java:38）在 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:459）在 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:678）在 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run（RemoteTestRunner.java:382）在 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main（RemoteTestRunner.java:192）

我的代码是这样的包装功能;

@RunWith(MockitoJUnitRunner.class)
public class PrintStatementFeature {

    @Mock Console console;  
    private Account account;

    @Before 
    public void initialise() {
        TransactionRepository transactionRepository = new TransactionRepository();
        account = new Account(transactionRepository); //now create its local variable.
    }

    @Test public void   
    print_statement_containing_all_transactions ()
    {
        account.deposit(1000);
        account.withdraw(100);
        account.deposit(500);

        account.printStatement();

        InOrder inOrder = inOrder(console);

        inOrder.verify(console).printLine("DATE.........|...AMOUNT...|...BALANCE... ");
        inOrder.verify(console).printLine("17/04/2015...|....500.....|.....1400.... ");
        inOrder.verify(console).printLine("15/04/2015...|...-100.....|.....1400.... ");
        inOrder.verify(console).printLine("10/04/2015...|....1000....|.....1500.... ");
    }


}

Answer 1

NullPointerExceptions总是错误，因为缺少实例。尝试使用命令if(Account.deposit == null){ ... }中的解决方法或发布更多代码。我正在编写jUnit-Tests很长一段时间，我想你只是嘲笑/创建了一个包装类的假人，但你忘了为这个测试创建所需的成员。

尝试为您的测试创建Helper-Classes，这样他们就可以为您的测试空白和随机填充创建所需的所有Dummy-Class。

运行JUNit测试时显示NullPointerException ..但我的代码完全没有错误

1 个答案: