add test

GIGA/Modules/Mask/Exercises/Model/ExercisesModel.m

@@ -9,8 +9,14 @@
 #import "ExercisesModel.h"
 
 @implementation ExercisesModel
-//+(JSONKeyMapper *)keyMapper{
-//    return [[JSONKeyMapper alloc] initWithModelToJSONDictionary:@{@"id":@"answer_id"}];
-//}
+
++(JSONKeyMapper *)keyMapper{
+    return [[JSONKeyMapper alloc] initWithModelToJSONDictionary:@{@"questionId":@"id"}];
+}
+
++ (BOOL)propertyIsOptional:(NSString *)propertyName{
+    
+    return YES;
+}
 
 @end