public static <T> void assertResultError(final FEELFnResult<T> result, final Class expectedErrorEventClass) { Assert.assertThat(result, Matchers.notNullValue()); Assert.assertThat(result.isLeft(), Matchers.is(true)); final FEELEvent resultEvent = result.cata(left -> left, right -> null); checkErrorEvent(resultEvent, expectedErrorEventClass); }