How do you assert that a certain exception is thrown in JUnit 4 tests?

Question

How can I use JUnit4 idiomatically to test that some code throws an exception?

While I can certainly do something like this:

@Test
public void testFo         


        

Answer 1

JUnit framework has assertThrows() method:

ArithmeticException exception = assertThrows(ArithmeticException.class, () ->
    calculator.divide(1, 0));
assertEquals("/ by zero", exception.getMessage());

• for JUnit 5 it's in org.junit.jupiter.api.Assertions class;
• for JUnit 4.13 it's in org.junit.Assert class;
• for earlier versions of JUnit 4: just add reference on org.junit.jupiter:junit-jupiter-api to your project and you'll get perfectly well working version from JUnit 5.