How can I test raise exception in JUnit5? [duplicate]

Question

I want to test whether exception works well or not using JUnit5.

For example, let say I test queue.

public class ArrayCircleQueue {
    .
    .
    .
    public void enQueue(char item) {
        if (isFull()) {
            throw new IndexOutOfBoundsException("Queue is full now!");
        } else {
            itemArray[rear++] = item;
        }
    }
}

TestClass

class ArrayCircleQueueTest {
    .
    .
    .
    @org.junit.jupiter.api.Test
    void testEnQueueOverflow() {
        for (int i=0; i<100; i++) {
            queue.enQueue('c');  # test for 10-size queue. It should catch exception
        }
    }
}

I search it in google, but there are only answer for JUnit4: @Test(expected=NoPermissionException.class)

but it doesn't work on JUnit5.

How can I deal with it?

Answer 1

@Test
void exceptionTesting() {
    Throwable exception = assertThrows(IllegalArgumentException.class, () -> {
        arrayCircleQueue.enQueue('a') ;
    });
    assertEquals("Queue is full now!", exception.getMessage());
}

Or you can try it.