JUnit Eclipse 检查是否抛出异常

Question

嘿伙计们，我有这个 Junit 测试代码的阶乘

@org.junit.Test
public void testIterationAAA()
{
    Iteration test = new Iteration("AAA");
    int result = test.factorial("AAA");
    assertEquals("exceptionMessage",result);
}

据说由于无法计算字符串的阶乘，因此应该抛出我所做的异常，但是如何使用Junit对其进行测试？

Answer 1

import org.junit.Assert;
...
@org.junit.Test
public void testIterationAAA()
{
    try {
         Iteration test = new Iteration("AAA");
         int result = test.factorial("AAA");
         // The above line is expected to throw an exception.
         // If the code does not throw an exception, fail the test.
         Assert.fail("An exception should have been thrown");
    } catch (Exception ex) {
         // Nothing to do.  Exception was expected in this test case.
    }
}

Answer 2

你应该

使用expected属性

@Test(expected=SomeException.class)