Albert Rosa It's not what you say it's how you say it

Android Testing for Exception With Robolectric.

I've been wanting to test runtime errors that I throw when certain criterias have not been met, Fairly easy to do with JUNIT itself but I found it difficult to use the expected annotation since when testing with Robolectric you receive a runtime exception first then drill into the cause of the exception.

here's how I found my way around this issue

@Test
public void testNullPointerWithURL() throws Exception{
try{
sample.execute();
fail("Should fail will Runtime Exception");
} catch (java.lang.RuntimeException e){
assertThat(e.getCause().getClass().getName(), CoreMatchers.is(NullPointerException.class.getName()));
}
}

sample.execute throws a NullPointerException. I wanted to validate in test that the exception was actually being executed.