flags: add flag cooldown test.

app/models/post_flag.rb

@@ -163,8 +163,8 @@ class PostFlag < ActiveRecord::Base
   end
 
   def initialize_creator
-    self.creator_id = CurrentUser.id
-    self.creator_ip_addr = CurrentUser.ip_addr
+    self.creator_id ||= CurrentUser.id
+    self.creator_ip_addr ||= CurrentUser.ip_addr
   end
 
   def resolve!

test/unit/post_approval_test.rb

@@ -49,7 +49,9 @@ class PostApprovalTest < ActiveSupport::TestCase
           @post.approve!(@approver2)
           assert_not_equal(@approver.id, @post.approver_id)
           CurrentUser.user = @user3
-          @post.flag!("blah blah")
+          travel_to(PostFlag::COOLDOWN_PERIOD.from_now + 1.minute) do
+            @post.flag!("blah blah")
+          end
 
           approval = @post.approve!(@approver)
           assert_includes(approval.errors.full_messages, "You have previously approved this post and cannot approve it again")

test/unit/post_flag_test.rb

@@ -44,7 +44,7 @@ class PostFlagTest < ActiveSupport::TestCase
           @post_flag = PostFlag.create(:post => @post, :reason => "aaa", :is_resolved => false)
         end
 
-        assert_equal(["You have already flagged this post"], @post_flag.errors.full_messages)
+        assert_equal(["have already flagged this post"], @post_flag.errors[:creator_id])
       end
 
       should "not be able to flag more than 10 posts in 24 hours" do
@@ -64,6 +64,23 @@ class PostFlagTest < ActiveSupport::TestCase
         assert_equal(["Post is deleted"], @post_flag.errors.full_messages)
       end
 
+      should "not be able to flag a post in the cooldown period" do
+        users = FactoryGirl.create_list(:user, 2, created_at: 2.weeks.ago)
+        flag1 = FactoryGirl.create(:post_flag, post: @post, creator: users.first)
+        @post.approve!
+
+        travel_to(PostFlag::COOLDOWN_PERIOD.from_now - 1.minute) do
+          flag2 = FactoryGirl.build(:post_flag, post: @post, creator: users.second)
+          assert(flag2.invalid?)
+          assert_match(/cannot be flagged more than once/, flag2.errors[:post].join)
+        end
+
+        travel_to(PostFlag::COOLDOWN_PERIOD.from_now + 1.minute) do
+          flag3 = FactoryGirl.build(:post_flag, post: @post, creator: users.second)
+          assert(flag3.valid?)
+        end
+      end
+
       should "initialize its creator" do
         @post_flag = PostFlag.create(:post => @post, :reason => "aaa", :is_resolved => false)
         assert_equal(@alice.id, @post_flag.creator_id)