Use org.assertj.core.api.Assertions instead of AssertionsForClassTypes.

Signed-off-by: Haotian Zhang <[email protected]>

Author: SkyeBeFreeman

spring-cloud-gateway-server-webflux/src/test/java/org/springframework/cloud/gateway/route/RouteDefinitionMetricsTests.java

@@ -31,12 +31,13 @@
 
 import org.springframework.cloud.gateway.event.RefreshRoutesEvent;
 
-import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.when;
 
 /**
  * @author Fredrich Ombico
+ * @author Haotian Zhang
  */
 @ExtendWith(MockitoExtension.class)
 class RouteDefinitionMetricsTests {