Raise the minimum supported version of JUnit to 6.0

This commit upgrades to JUnit 6.0.0 and removes any references left
of previous JUnit versions.

Closes gh-1676

Author: snicoll

spring-ws-platform/build.gradle

@@ -27,7 +27,7 @@ dependencies {
 	api(platform("org.apache.activemq:activemq-bom:6.1.7"))
 	api(platform("org.eclipse.jetty:jetty-bom:12.0.23"))
 	api(platform("org.eclipse.jetty.ee10:jetty-ee10-bom:12.0.23"))
-	api(platform("org.junit:junit-bom:5.13.3"))
+	api(platform("org.junit:junit-bom:6.0.0"))
 	api(platform("org.slf4j:slf4j-bom:2.0.17"))
 	api(platform("org.springframework:spring-framework-bom:${springFrameworkVersion}"))
 	api(platform("org.springframework.security:spring-security-bom:7.0.0-SNAPSHOT"))

spring-ws-test/src/main/java/org/springframework/ws/test/client/MockWebServiceServer.java

@@ -50,17 +50,16 @@
  * the mocks.
  * <p>
  * For example: <pre><code class="java">
- * import org.junit.*;
  * import org.springframework.beans.factory.annotation.Autowired;
- * import org.springframework.test.context.ContextConfiguration;
- * import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+ * import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  * import org.springframework.xml.transform.StringSource;
+
  * <strong>import org.springframework.ws.test.client.MockWebServiceServer</strong>;
  * <strong>import static org.springframework.ws.test.client.RequestMatchers.*</strong>;
  * <strong>import static org.springframework.ws.test.client.ResponseCreators.*</strong>;
+ * import static org.assertj.core.api.Assertions.assertThat;
  *
- * &#064;RunWith(SpringJUnit4ClassRunner.class)
- * &#064;ContextConfiguration("applicationContext.xml")
+ * &#064;SpringJUnitConfig(locations = "applicationContext.xml")
  * public class MyWebServiceClientIntegrationTest {
  *
  *	 // MyWebServiceClient extends WebServiceGatewaySupport, and is configured in applicationContext.xml
@@ -86,7 +85,7 @@
  *
  *	   // client.getCustomerCount() uses the WebServiceTemplate
  *	   int customerCount = client.getCustomerCount();
- *	   assertEquals(10, response.getCustomerCount());
+ *	   assertThat(response.getCustomerCount()).isEqualTo(10);
  *
  *	   <strong>mockServer.verify();</strong>
  *	 }

spring-ws-test/src/main/java/org/springframework/ws/test/server/MockWebServiceClient.java

@@ -57,18 +57,16 @@
  * the mocks.
  * <p>
  * For example: <pre><code class="java">
- * import org.junit.*;
  * import org.springframework.beans.factory.annotation.Autowired;
  * import org.springframework.context.ApplicationContext;
- * import org.springframework.test.context.ContextConfiguration;
- * import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+ * import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
  * import org.springframework.xml.transform.StringSource;
+ *
  * <strong>import org.springframework.ws.test.server.MockWebServiceClient</strong>;
  * <strong>import static org.springframework.ws.test.server.RequestCreators.*</strong>;
  * <strong>import static org.springframework.ws.test.server.ResponseMatchers.*</strong>;
  *
- * &#064;RunWith(SpringJUnit4ClassRunner.class)
- * &#064;ContextConfiguration("applicationContext.xml")
+ * &#064;SpringJUnitConfig(locations = "applicationContext.xml")
  * public class MyWebServiceIntegrationTest {
  *
  *	 // a standard MessageDispatcherServlet application context, containing endpoints, mappings, etc.