Make test classes package private

See gh-1184

spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterBuilderTests.java

@@ -43,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Rossen Stoyanchev
  */
-public class GraphQlTesterBuilderTests extends GraphQlTesterTestSupport {
+class GraphQlTesterBuilderTests extends GraphQlTesterTestSupport {
 
 	private static final String DOCUMENT = "{ Query }";
 

spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterTests.java

@@ -42,7 +42,7 @@ import static org.assertj.core.api.Assertions.assertThatThrownBy;
  * @author Rossen Stoyanchev
  * @author Brian Clozel
  */
-public class GraphQlTesterTests extends GraphQlTesterTestSupport {
+class GraphQlTesterTests extends GraphQlTesterTestSupport {
 
 	@Test
 	void missingDocumentByName() {

spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/RSocketGraphQlTesterBuilderTests.java

@@ -48,10 +48,10 @@ import org.springframework.util.MimeType;
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
- *
+ * Tests for {@link RSocketGraphQlTester.Builder}.
  * @author Rossen Stoyanchev
  */
-public class RSocketGraphQlTesterBuilderTests {
+class RSocketGraphQlTesterBuilderTests {
 
 	private static final String DOCUMENT = "{ Query }";
 

spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/WebGraphQlTesterBuilderTests.java

@@ -68,7 +68,7 @@ import static org.springframework.web.reactive.function.server.RouterFunctions.r
  *
  * @author Rossen Stoyanchev
  */
-public class WebGraphQlTesterBuilderTests {
+class WebGraphQlTesterBuilderTests {
 
 	private static final String DOCUMENT = "{ Query }";