fix for GRAILS-5669 "On a controller integration test, calling render with a GSP on a base controller results in Cannot set readonly property: modelAndView"

Author: graemerocher

src/java/grails/test/MockUtils.groovy

@@ -37,6 +37,8 @@ import org.springframework.beans.SimpleTypeConverter
 import org.springframework.mock.web.MockHttpSession
 import org.springframework.validation.Errors
 import org.springframework.web.context.request.RequestContextHolder
+import org.springframework.web.servlet.ModelAndView;
+
 import grails.validation.ValidationException
 
 /**
@@ -103,7 +105,7 @@ class MockUtils {
         def renArgs = [:]
         def chaArgs = [:]
         def template = [:]
-        def modelAndView = [:]
+        def modelAndView = new ModelAndView()
         clazz.metaClass.getForwardArgs = {-> fwdArgs}
         clazz.metaClass.getRedirectArgs ={-> redArgs}
         clazz.metaClass.getRenderArgs ={-> renArgs}
@@ -227,6 +229,7 @@ class MockUtils {
 
         clazz.metaClass.getTemplate = {-> template}
         clazz.metaClass.getModelAndView = {-> modelAndView}
+		clazz.metaClass.setModelAndView = { ModelAndView mv -> modelAndView = mv}
     }
 
     /**

src/test/grails/test/ControllerUnitTestCaseTests.groovy

@@ -1,5 +1,7 @@
 package grails.test;
 
+import org.springframework.web.servlet.ModelAndView;
+
 /**
  * Test case for {@link ControllerUnitTestCase}.
  */
@@ -25,9 +27,22 @@ class ControllerUnitTestCaseTests extends GroovyTestCase {
         testCase.testCommandObject()
         testCase.tearDown()
     }
+	
+	void testGetSetModelAndView() {
+		def testCase = new UnitTestControllerTestCase()
+		testCase.setUp()
+		testCase.testModelAndView()
+		testCase.tearDown()
+				
+	}
 }
 
 class UnitTestControllerTestCase extends ControllerUnitTestCase {
+	
+	void testModelAndView() {
+		controller.testSetModelAndView()
+	}
+	
     void testControllerClass() {
         assertEquals UnitTestController, controllerClass
         assertEquals "unitTest", controller.controllerName
@@ -74,6 +89,11 @@ class UnitTestController {
     def index = {
 
     }
+	
+	def testSetModelAndView() {
+    	modelAndView = new ModelAndView()
+		println modelAndView.viewName
+	}
 }
 
 class ControllerUnitTestCaseCommandObject {