Junit @之前无法正常工作 [英] Junit @Before not working properly

问题描述

@Before
public void setup(){
    Ground ground = new Ground(100, 100);
}

@Test
public void getDimX(){
    String msg = "For a newly created Ground(100, 100), ground.getDimensionX()      should return 100";
    assertEquals(100, ground.getDimensionX());
}

上面的代码返回一个NullPointerException.如果将Ground ground = new Ground(4, 4);移到getDimX()方法中，则测试运行正常.我有很多使用相同基础的测试，所以我不希望每个测试用例都做一个新的测试.另外，如果我完全摆脱了@Begin块，而只保留了地面实例化，它也可以正常工作.那么@Before?

The above code returns a NullPointerException. If I move the Ground ground = new Ground(4, 4); into the getDimX() method, the test runs just fine. I have a number of tests that will use the same ground, so I would prefer not to make a new one with each test case. Also, if I get rid of the @Begin block entirely and just leave the ground instantiation, it also works fine. What then is the point of the @Before?

推荐答案

在测试设置之外的测试类中创建了一个私有字段，即

created a private field in your test class outside your test setup, i.e.

public class MyTest{
    private Ground ground;
    ...
}

然后在before()

@Before
public void before(){ground = new Ground(100,100);}

这篇关于Junit @之前无法正常工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！