TestExceptionChecker
Using @Test(expected=...) is discouraged, since the test will pass if *any* statement in the test method throws the expected exception

Severity
WARNING

The problem

The use of @Test(expected = FooException.class) is strongly discouraged, since the test passes if any statement throws an exception of the expected type.

For example, if add(0, "a") throws an UnsupportedOperationException below, the test will pass without even executing remove(0), much less testing whether it throws the right kind of exception. Such false negatives are particularly likely when testing for common unchecked exceptions like NullPointerException.

@Test(expected = UnsupportedOperationException.class)
public void testRemoveFails() {
  AppendOnlyList list = new AppendOnlyList();
  list.add(0, "a");
  list.remove(0);
}

To avoid this issue, prefer JUnit’s assertThrows() API:

import static org.junit.Assert.assertThrows;

@Test
public void testRemoveFails() {
  AppendOnlyList list = new AppendOnlyList();
  list.add(0, "a");
  assertThrows(UnsupportedOperationException.class, () -> {
    list.remove(0);
  });
}

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("TestExceptionChecker") to the enclosing element.