title: Grails3 controller integration test case fail: No thread-bound request found
body: <p>With just simple following controller action spock integration-test. Here is my Test. </p>
  
  <pre><code>@Integration
  @Rollback
  class TestControllerSpec extends Specification {
  
      def setup() {
      }
  
      def cleanup() {
      }
  
      void "test something"() {
         setup:
          def c = new TestController()
          c.index()
          expect:
          c.response.contentType !=null
      }
  }
  </code></pre>
  
  <p>getting following  Exception</p>
  
  <pre><code>java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
      at org.springframework.web.context.request.RequestContextHolder.currentRequestAttributes(RequestContextHolder.java:131)
      at grails.web.api.WebAttributes$Trait$Helper.currentRequestAttributes(WebAttributes.groovy:45)
      at grails.web.api.ServletAttributes$Trait$Helper.getRequest(ServletAttributes.groovy:42)
  </code></pre>