fix: fix ConfigChangeListener ut bug (#1660)

CHANGELOG.md

@@ -4,3 +4,4 @@
 - [fix:fix PolarisContextProperties instantiated twice causing NPE.](https://github.com/Tencent/spring-cloud-tencent/pull/1640)
 - [fix: fix ConfigChangeListener and unit test](https://github.com/Tencent/spring-cloud-tencent/pull/1655)
 - [feat: support spring-retry and feign config refresh and feign eager load support schema](https://github.com/Tencent/spring-cloud-tencent/pull/1650)
+- [fix: fix ConfigChangeListener ut bug](https://github.com/Tencent/spring-cloud-tencent/pull/1660)

spring-cloud-starter-tencent-polaris-config/src/test/java/com/tencent/cloud/polaris/config/listener/ConfigChangeListenerTest.java

@@ -57,7 +57,7 @@ import static org.springframework.boot.test.context.SpringBootTest.WebEnvironmen
 		})
 public class ConfigChangeListenerTest {
 
-	private static final CountDownLatch hits = new CountDownLatch(2);
+	private static CountDownLatch hits = new CountDownLatch(2);
 	@Autowired
 	private ApplicationEventPublisher applicationEventPublisher;
 	@Autowired
@@ -90,8 +90,10 @@ public class ConfigChangeListenerTest {
 			EnvironmentChangeEvent event = new EnvironmentChangeEvent(applicationContext, ketSet);
 			applicationEventPublisher.publishEvent(event);
 			//after change
+			//Reset hits for each iteration
 			boolean ret = hits.await(2, TimeUnit.SECONDS);
 			Assertions.assertThat(ret).isEqualTo(true);
+			hits = new CountDownLatch(2);
 			Assertions.assertThat(testConfig.getChangeCnt()).isEqualTo(2 * i - 2);
 			Assertions.assertThat(testConfig.getSyncChangeCnt()).isEqualTo(2 * i - 2);
 			Assertions.assertThat(testConfig.getTimeout()).isEqualTo(i * 1000);