Question

In JUnit 4 you can declare expected exception using @Test(expected = SomeException.class) annotation. However, when testing is done using Theories, @Theory annotation does not have expected property.

What is the best way to declare expected exception when testing Theories?

Answer 1

I prefer using ExpectedException rule:

import org.junit.rules.ExpectedException;

<...>

@Rule
public ExpectedException thrown = ExpectedException.none();

@Theory
public void throwExceptionIfArgumentIsIllegal(Type type) throws Exception {
    assumeThat(type, equalTo(ILLEGAL));
    thrown.expect(IllegalArgumentException.class);
    //perform actions
}