Use text block where feasible

See gh-31916

spring-webmvc/src/test/java/org/springframework/web/servlet/ComplexWebApplicationContext.java

@@ -114,8 +114,11 @@ public class ComplexWebApplicationContext extends StaticWebApplicationContext {
 
 		pvs = new MutablePropertyValues();
 		pvs.add(
-				"mappings", "/head.do=headController\n" +
-				"body.do=bodyController\n/noview*=noviewController\n/noview/simple*=noviewController");
+				"mappings", """
+						/head.do=headController
+						body.do=bodyController
+						/noview*=noviewController
+						/noview/simple*=noviewController""");
 		pvs.add("order", "1");
 		registerSingleton("handlerMapping", SimpleUrlHandlerMapping.class, pvs);
 

spring-webmvc/src/test/java/org/springframework/web/servlet/function/SseServerResponseTests.java

@@ -109,11 +109,13 @@ class SseServerResponseTests {
 		ModelAndView mav = response.writeTo(this.mockRequest, this.mockResponse, context);
 		assertThat(mav).isNull();
 
-		String expected = "data:{\n" +
-				"data:  \"name\" : \"John Doe\",\n" +
-				"data:  \"age\" : 42\n" +
-				"data:}\n" +
-				"\n";
+		String expected = """
+				data:{
+				data:  "name" : "John Doe",
+				data:  "age" : 42
+				data:}
+
+				""";
 		assertThat(this.mockResponse.getContentAsString()).isEqualTo(expected);
 	}