Question

方法进程实际上是抛出异常但是当我在junit中测试它时不能正常工作尽管我在@Test注释旁边放置了要抛出的预期异常但测试失败了为什么会发生这种情况？

java.lang.ArithmeticException: / by zero
at com.javageek.junit.Calculator.process(Calculator.java:88)
at com.javageek.junit.CalculatorTest.CalculatorTestDivisionByZero(CalculatorTest.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:19)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)







@Test(expected=ArithmeticException.class)
public void CalculatorTestDivisionByZero(){
    Calculator calculator = new Calculator();
    calculator.process("DivisionByZero.txt");
}

Answer 1

您需要将测试类的Runner指定为：

@RunWith(JUnit4.class)

另外，您的测试功能可能不应该以大写字母开头（ C alculatorTestDivisionByZero）。

Answer 2

以下为我工作（即测试通过）：

@Test(expected=ArithmeticException.class)
public void CalculatorTestDivisionByZero(){
    int i = 23 / 0;
    System.out.println("i=" + i);
}

我不需要小写方法或@RunWith。

也许你的计算器正在启动另一个线程或进程？然后在测试线程中不会抛出异常。您还可以检查是否要导入正确的ArithmeticException类，可能还有其他应用程序提供的类。

无法在junit中捕获算术异常

2 个答案: