Junit @Before not working properly

java, junit

Solution

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

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

Then instantiate ground in your `before()`

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

Problem

``` @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()); } ``` 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?`

Original source