Polish access modifiers for test classes

See gh-27736

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/ConfigTreeConfigDataLoaderTests.java

@@ -37,7 +37,7 @@ import static org.mockito.Mockito.mock;
  * @author Madhura Bhave
  * @author Phillip Webb
  */
-public class ConfigTreeConfigDataLoaderTests {
+class ConfigTreeConfigDataLoaderTests {
 
 	private ConfigTreeConfigDataLoader loader = new ConfigTreeConfigDataLoader();
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/ConfigTreeConfigDataResourceTests.java

@@ -30,7 +30,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException
  * @author Madhura Bhave
  * @author Phillip Webb
  */
-public class ConfigTreeConfigDataResourceTests {
+class ConfigTreeConfigDataResourceTests {
 
 	@Test
 	void constructorWhenPathStringIsNullThrowsException() {

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/StandardConfigDataLoaderTests.java

@@ -34,7 +34,7 @@ import static org.mockito.Mockito.mock;
  * @author Madhura Bhave
  * @author Phillip Webb
  */
-public class StandardConfigDataLoaderTests {
+class StandardConfigDataLoaderTests {
 
 	private StandardConfigDataLoader loader = new StandardConfigDataLoader();
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/StandardConfigDataLocationResolverTests.java

@@ -44,7 +44,7 @@ import static org.mockito.Mockito.mock;
  * @author Madhura Bhave
  * @author Phillip Webb
  */
-public class StandardConfigDataLocationResolverTests {
+class StandardConfigDataLocationResolverTests {
 
 	private StandardConfigDataLocationResolver resolver;
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/StandardConfigDataResourceTests.java

@@ -31,7 +31,7 @@ import static org.mockito.Mockito.mock;
  * @author Madhura Bhave
  * @author Phillip Webb
  */
-public class StandardConfigDataResourceTests {
+class StandardConfigDataResourceTests {
 
 	StandardConfigDataReference reference = mock(StandardConfigDataReference.class);
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/BoundPropertiesTrackingBindHandlerTests.java

@@ -41,7 +41,7 @@ import static org.mockito.Mockito.verify;
  * @author Madhura Bhave
  */
 @ExtendWith(MockitoExtension.class)
-public class BoundPropertiesTrackingBindHandlerTests {
+class BoundPropertiesTrackingBindHandlerTests {
 
 	private List<ConfigurationPropertySource> sources = new ArrayList<>();
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/RestTemplateBuilderClientHttpRequestInitializerTests.java

@@ -43,7 +43,7 @@ import static org.mockito.Mockito.mock;
  * @author Ilya Lukyanovich
  * @author Phillip Webb
  */
-public class RestTemplateBuilderClientHttpRequestInitializerTests {
+class RestTemplateBuilderClientHttpRequestInitializerTests {
 
 	private final MockClientHttpRequest request = new MockClientHttpRequest();
 

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

@@ -29,7 +29,7 @@ import static org.mockito.Mockito.mock;
  *
  * @author Phillip Webb
  */
-public class WebServerApplicationContextTests {
+class WebServerApplicationContextTests {
 
 	@Test
 	void hasServerNamespaceWhenContextIsNotWebServerApplicationContextReturnsFalse() {