comment policy and test updates

test/policies/quiz_comment_policy_test.rb

@@ -9,11 +9,14 @@ class QuizCommentPolicyTest < PolicyAssertions::Test
   end
 
   def test_create
-    assert_permit users(:admin), QuizComment
-    assert_permit users(:manager), QuizComment
-    assert_permit users(:reviewer), QuizComment
+    candidate = candidates(:stacy)
+    comment = QuizComment.new(test_hash: candidate.test_hash)
 
-    refute_permit users(:recruiter), QuizComment
+    assert_permit users(:manager), comment
+    assert_permit users(:reviewer), comment
+
+    refute_permit users(:admin), comment
+    refute_permit users(:recruiter), comment
   end
 
   def test_update