Spring Boot and Spock Integration Testing

I am new to Spring Boot and while testing a REST endpoint with SPOCK came across issue # 24405727 I tried the exact configuration but I get the following exception.

java.lang.IllegalStateException: of The WebApplicationContext for test context The [ TestContext @ 21a722ef testClass = HelloControllerSpec, testInstance = com.hello.HelloControllerSpec@63e68a2b , TestMethod = [null], TestException = [null], mergedContextConfiguration = [ WebMergedContextConfiguration @ 3479404a testClass = HelloControllerSpec , locations = '{}', classes = '{class com.Application}', contextInitializerClasses = '[]', activeProfiles = '{}', resourceBasePath = 'src / main / webapp', contextLoader = 'org.springframework. boot.test.SpringApplicationContextLoader ', parent = [null]]] must be configured with a MockServletContext.
    at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary (ServletTestExecutionListener.java:111)
    at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance (ServletTestExecutionListener.java:74)
    at org.springframework.test.context.TestContextManager.prepareTestInstance (TestContextManager.java:312)
    at org.spockframework.spring.SpringTestContextManager.prepareTestInstance (SpringTestContextManager.java:49)
    at org.spockframework.spring.SpringInterceptor.interceptSetupMethod (SpringInterceptor.java:42)
    at org.spockframework.runtime.extension.AbstractMethodInterceptor.intercept (AbstractMethodInterceptor.java:28)
    at org.spockframework.runtime.extension.MethodInvocation.proceed (MethodInvocation.java:84)
    at org.spockframework.util.ReflectionUtil.invokeMethod (ReflectionUtil.java:138)
    at org.spockframework.util.ReflectionUtil.invokeMethod (ReflectionUtil.java:138)
    at org.spockframework.util.ReflectionUtil.invokeMethod (ReflectionUtil.java:138)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass (JUnitTestClassExecuter.java:86)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute (JUnitTestClassExecuter.java:49)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass (JUnitTestClassProcessor.java:69)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass (SuiteTestClassProcessor.java:48)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch (ReflectionDispatch.java:35)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch (ReflectionDispatch.java:24)
    at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch (ContextClassLoaderDispatch.java:32)
    at org.gradle.messaging.dispatch.ProxyDispatchAdapter $ DispatchingInvocationHandler.invoke (ProxyDispatchAdapter.java:93)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass (TestWorker.java:105)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch (ReflectionDispatch.java:35)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch (ReflectionDispatch.java:24)
    at org.gradle.messaging.remote.internal.hub.MessageHub $ Handler.run (MessageHub.java:355)
    at org.gradle.internal.concurrent.DefaultExecutorFactory $ StoppableExecutorImpl $ 1.run (DefaultExecutorFactory.java:64)
    at java.util.concurrent.ThreadPoolExecutor $ Worker.runTask (ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor $ Worker.run (ThreadPoolExecutor.java:908)
    at java.lang.Thread.run (Thread.java:662)

Below is my Groovy spock spec

@ContextConfiguration(loader = SpringApplicationContextLoader.class, classes = Application.class)
@WebAppConfiguration
@IntegrationTest
class HelloControllerSpec extends Specification {

def "Greeting test"() {
       when:
            ResponseEntity entity = new RestTemplate().getForEntity("http://localhost:8080",       String.class);

            then:
            entity.statusCode == HttpStatus.OK
                   }

      

        
        
        
      

    

} `

Any help is appreciated.