Fix the actual failing test

spec/serializers/reviewable_flagged_post_serializer_spec.rb

@@ -12,7 +12,7 @@ describe ReviewableFlaggedPostSerializer do
     json = ReviewableFlaggedPostSerializer.new(reviewable, scope: Guardian.new(admin), root: nil).as_json
     expect(json[:cooked]).to eq(p0.cooked)
     expect(json[:raw]).to eq(p0.raw)
-    expect(json[:target_url]).to eq(p0.url)
+    expect(json[:target_url]).to eq(Discourse.base_url + p0.url)
   end
 
   it "works when the topic is deleted" do

spec/serializers/reviewable_serializer_spec.rb

@@ -35,7 +35,6 @@ describe ReviewableSerializer do
   describe "urls" do
 
     it "links to the flagged post" do
-      Discourse.stubs(:base_url).returns("http://test.localhost/subfolder")
       fp = Fabricate(:reviewable_flagged_post)
       json = described_class.new(fp, scope: Guardian.new(admin), root: nil).as_json
       expect(json[:target_url]).to eq(Discourse.base_url + fp.post.url)