你怎么断言在JUnit 4测试中抛出某个异常？

问题描述

如何以惯用方式使用JUnit4来测试某些代码是否会抛出异常？

虽然我当然可以这样做：

  @Test 
 public void testFooThrowsIndexOutOfBoundsException（）{
 boolean thrown = false; 
 
试试{
 foo.doStuff（）; 
} catch（IndexOutOfBoundsException e）{
 thrown = true; 
} 
 
 assertTrue（抛出）; 
} 
  

我记得有一个注释或Assert.xyz或

解决方案

解决方案

> JUnit 4支持：

  @Test（expected = IndexOutOfBoundsException.class）
 public void testIndexOutOfBoundsException（） {
 ArrayList emptyList = new ArrayList（）; 
 Object o = emptyList.get（0）; 
} 
  

参考：

How can I use JUnit4 idiomatically to test that some code throws an exception?

While I can certainly do something like this:

@Test
public void testFooThrowsIndexOutOfBoundsException() {
  boolean thrown = false;

  try {
    foo.doStuff();
  } catch (IndexOutOfBoundsException e) {
    thrown = true;
  }

  assertTrue(thrown);
}

I recall that there is an annotation or an Assert.xyz or something that is far less kludgy and far more in-the-spirit of JUnit for these sorts of situations.

解决方案

JUnit 4 has support for this:

@Test(expected = IndexOutOfBoundsException.class)
public void testIndexOutOfBoundsException() {
    ArrayList emptyList = new ArrayList();
    Object o = emptyList.get(0);
}

Reference: https://junit.org/junit4/faq.html#atests_7

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