@Test public void testProperties() { EventTimeSessionWindows assigner = EventTimeSessionWindows.withGap(Time.seconds(5)); assertTrue(assigner.isEventTime()); assertEquals(new TimeWindow.Serializer(), assigner.getWindowSerializer(new ExecutionConfig())); assertThat(assigner.getDefaultTrigger(mock(StreamExecutionEnvironment.class)), instanceOf(EventTimeTrigger.class)); }