Fix issue with intermittent api/v1/notifications failure (#1606)

The spec was checking the activity_id of the activities held in notifications
within the controller.

Because the activities are different models, it is possible that they are
created with the same database IDs, and when they are this spec fails because an
activity which should not count as a match is counted as one.

spec/controllers/api/v1/notifications_controller_spec.rb

@@ -13,10 +13,11 @@ RSpec.describe Api::V1::NotificationsController, type: :controller do
 
   describe 'GET #index' do
     before do
-      status     = PostStatusService.new.call(user.account, 'Test')
+      first_status = PostStatusService.new.call(user.account, 'Test')
-      @reblog    = ReblogService.new.call(other.account, status)
+      @reblog_of_first_status = ReblogService.new.call(other.account, first_status)
-      @mention   = PostStatusService.new.call(other.account, 'Hello @alice')
+      mentioning_status = PostStatusService.new.call(other.account, 'Hello @alice')
-      @favourite = FavouriteService.new.call(other.account, status)
+      @mention_from_status = mentioning_status.mentions.first
+      @favourite = FavouriteService.new.call(other.account, first_status)
       @follow = FollowService.new.call(other.account, 'alice')
     end
 
@@ -30,19 +31,19 @@ RSpec.describe Api::V1::NotificationsController, type: :controller do
       end
 
       it 'includes reblog' do
-        expect(assigns(:notifications).map(&:activity_id)).to include(@reblog.id)
+        expect(assigns(:notifications).map(&:activity)).to include(@reblog_of_first_status)
       end
 
       it 'includes mention' do
-        expect(assigns(:notifications).map(&:activity_id)).to include(@mention.mentions.first.id)
+        expect(assigns(:notifications).map(&:activity)).to include(@mention_from_status)
       end
 
       it 'includes favourite' do
-        expect(assigns(:notifications).map(&:activity_id)).to include(@favourite.id)
+        expect(assigns(:notifications).map(&:activity)).to include(@favourite)
       end
 
       it 'includes follow' do
-        expect(assigns(:notifications).map(&:activity_id)).to include(@follow.id)
+        expect(assigns(:notifications).map(&:activity)).to include(@follow)
       end
     end
 
@@ -56,19 +57,19 @@ RSpec.describe Api::V1::NotificationsController, type: :controller do
       end
 
       it 'includes reblog' do
-        expect(assigns(:notifications).map(&:activity_id)).to include(@reblog.id)
+        expect(assigns(:notifications).map(&:activity)).to include(@reblog_of_first_status)
       end
 
       it 'excludes mention' do
-        expect(assigns(:notifications).map(&:activity_id)).to_not include(@mention.mentions.first.id)
+        expect(assigns(:notifications).map(&:activity)).to_not include(@mention_from_status)
       end
 
       it 'includes favourite' do
-        expect(assigns(:notifications).map(&:activity_id)).to include(@favourite.id)
+        expect(assigns(:notifications).map(&:activity)).to include(@favourite)
       end
 
       it 'includes follow' do
-        expect(assigns(:notifications).map(&:activity_id)).to include(@follow.id)
+        expect(assigns(:notifications).map(&:activity)).to include(@follow)
       end
     end
   end