Assert fail with JUnit

Question

I have a class with an attribute I don't want to be null.

Si in the setter looks like this :

public void setFoo(String bar)
{
    if (bar == null)
        throw new IllegalArgumentException("Should not be null");
    foo = bar;
}

And in my JUnit test case, I would like to assert that if I do obj.setFoo(null), it will fail. How can I do this?

have you tried `Assert.assertNotNull()`? – Drux Nov 13 '14 at 17:09 — Drux, Nov 13 '14 at 17:09

score 2 · Accepted Answer · answered Nov 13 '14 at 17:09

JUnit4:

@Test(expected= IllegalArgumentException.class)
public void testNull() {
   obj.setFoo(null);
}

JUnit3:

public void testNull() {
   try {
       obj.setFoo(null);
       fail("IllegalArgumentException is expected");
   } catch (IllegalArgumentException e) {
       // OK
   }
}

score 1 · Answer 2 · answered Nov 13 '14 at 17:09

1

You can do like this

@Test (expected = IllegalArgumentException.class)
public void setFooTest(){
    myObject.setFoo(null);
}

answered Nov 13 '14 at 17:09

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Assert fail with JUnit

2 Answers2