JAVA-21298 Fix failing tests in spring-boot-testing module (#14289)

spring-boot-modules/spring-boot-testing-spock/src/main/java/com/baeldung/boot/Application.java

@@ -0,0 +1,14 @@
+package com.baeldung.boot;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+
+@SpringBootApplication
+public class Application {
+    private static ApplicationContext applicationContext;
+
+    public static void main(String[] args) {
+        applicationContext = SpringApplication.run(Application.class, args);
+    }
+}

spring-boot-modules/spring-boot-testing-spock/src/main/java/com/baeldung/boot/controller/rest/WebController.java

@@ -0,0 +1,36 @@
+package com.baeldung.boot.controller.rest;
+
+import java.util.Optional;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/hello")
+public class WebController {
+
+    private String name;
+
+    @GetMapping
+    public String salutation() {
+        return "Hello " + Optional.ofNullable(name).orElse("world") + '!';
+    }
+
+    @PutMapping
+    @ResponseStatus(HttpStatus.NO_CONTENT)
+    public void setName(@RequestBody final String name) {
+        this.name = name;
+    }
+
+    @DeleteMapping
+    @ResponseStatus(HttpStatus.NO_CONTENT)
+    public void resetToDefault() {
+        this.name = null;
+    }
+}

spring-boot-modules/spring-boot-testing-spock/src/main/resources/application.properties

@@ -0,0 +1,2 @@
+
+