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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?

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  • have you tried Assert.assertNotNull()? Commented Nov 13, 2014 at 17:09

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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 } }
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You can do like this 

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