GRAILS-11574 Add support for LocaleResolver in unit tests

Author: lhotari

grails-plugin-testing/src/main/groovy/grails/test/mixin/web/ControllerUnitTestMixin.groovy

@@ -73,6 +73,8 @@ import org.springframework.util.ClassUtils
 import org.springframework.web.context.WebApplicationContext
 import org.springframework.web.context.request.RequestContextHolder
 import org.springframework.web.multipart.commons.CommonsMultipartResolver
+import org.springframework.web.servlet.DispatcherServlet
+import org.springframework.web.servlet.i18n.SessionLocaleResolver
 
 /**
  * Applied to a unit test to test controllers.
@@ -238,6 +240,8 @@ class ControllerUnitTestMixin extends GrailsUnitTestMixin {
             }
 
             filteringCodecsByContentTypeSettings(FilteringCodecsByContentTypeSettings, ref('grailsApplication'))
+            
+            localeResolver(SessionLocaleResolver)
         }
         defineBeans(new CodecsGrailsPlugin().doWithSpring)
 
@@ -282,6 +286,7 @@ class ControllerUnitTestMixin extends GrailsUnitTestMixin {
         ConvertersPluginSupport.enhanceApplication(grailsApplication,applicationContext)
 
         request = new GrailsMockHttpServletRequest(requestMimeTypesApi:  new TestRequestMimeTypesApi(grailsApplication: grailsApplication, applicationContext: applicationContext))
+        request.setAttribute(DispatcherServlet.LOCALE_RESOLVER_ATTRIBUTE, applicationContext.getBean('localeResolver'))
         response = new GrailsMockHttpServletResponse(responseMimeTypesApi: new TestResponseMimeTypesApi(grailsApplication: grailsApplication, applicationContext: applicationContext))
         webRequest = GrailsWebUtil.bindMockWebRequest(applicationContext, request, response)
         request = (GrailsMockHttpServletRequest)webRequest.getCurrentRequest()

grails-test-suite-uber/src/test/groovy/grails/test/mixin/ControllerTestForTests.groovy

@@ -1,6 +1,7 @@
 package grails.test.mixin
 
 import org.junit.Test
+import org.springframework.web.servlet.support.RequestContextUtils
 
 @TestFor(SimpleController)
 @Mock(Simple)
@@ -29,6 +30,19 @@ class ControllerTestForTests {
         mockService.verify()
         assert response.text == 'goodbye'
     }
+    
+    @Test
+    void testLocaleResolver() {
+        def localeResolver = applicationContext.localeResolver
+        request.addPreferredLocale(Locale.FRANCE)
+        assert localeResolver.resolveLocale(request) == Locale.FRANCE
+    }
+    
+    @Test
+    void testLocaleResolverAttribute() {
+        assert RequestContextUtils.getLocaleResolver(request) == applicationContext.localeResolver
+    }
+
 }
 class SimpleController {
     def index = {