TestApplicationListener Class — spring-boot Architecture

Source Code

core/spring-boot/src/test/java/org/springframework/boot/context/event/EventPublishingRunListenerTests.java lines 90–111

	static class TestApplicationListener implements ApplicationListener<ApplicationEvent> {

		private final Deque<ApplicationEvent> events = new ArrayDeque<>();

		@Override
		public void onApplicationEvent(ApplicationEvent event) {
			this.events.add(event);
		}

		void assertReceivedNoEvents() {
			assertThat(this.events).isEmpty();
		}

		void assertReceivedEvent(Class<?>... eventClasses) {
			List<ApplicationEvent> receivedEvents = new ArrayList<>();
			while (!this.events.isEmpty()) {
				receivedEvents.add(this.events.pollFirst());
			}
			assertThat(receivedEvents).extracting("class").contains((Object[]) eventClasses);
		}

	}