Rename tests to match Surefire expectations

See gh-18579

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/elasticsearch/ElasticsearchRestHealthIndicatorTests.java

@@ -42,7 +42,7 @@ import static org.mockito.Mockito.mock;
  * @author Artsiom Yudovin
  * @author Filip Hrisafov
  */
-public class ElasticsearchRestHealthIndicatorTest {
+public class ElasticsearchRestHealthIndicatorTests {
 
 	private final RestClient restClient = mock(RestClient.class);
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/context/WebServerPortFileWriterTests.java

@@ -43,7 +43,7 @@ import static org.mockito.Mockito.mock;
  * @author Phillip Webb
  * @author Andy Wilkinson
  */
-public class WebServerPortFileWriterTest {
+public class WebServerPortFileWriterTests {
 
 	@Rule
 	public final TemporaryFolder temporaryFolder = new TemporaryFolder();