Assertions with `contains` should fail when jfrEvents.events is empty

[FBibonne]

Given a test case where no enabled event is recorded, for example :

    @Test
    @EnableEvent(FileRead.EVENT_NAME)
    void shouldFailBecauseNoFileIsRead() {
       // method to test which does not read file 
       produtionCode.doNotUseIO();
        jfrEvents.awaitEvents();
        assertThat(jfrEvents).contains(FileRead.INSTANCE);
    }

This test should fail because the method doNotUseIO in main code does not read any file so no FileRead event is recorded : the contains method should throw an AssertionError. But it does not in this case because jfrEvents.events : no event at all is recorded.