FIX: Topic title should be included in post webhook payload.

spec/serializers/web_hook_post_serializer_spec.rb

@@ -0,0 +1,24 @@
+require 'rails_helper'
+
+RSpec.describe WebHookPostSerializer do
+  let(:admin) { Fabricate(:admin) }
+  let(:post) { Fabricate(:post) }
+  let(:serializer) { WebHookPostSerializer.new(post, scope: Guardian.new(admin), root: false) }
+
+  it 'should only include the required keys' do
+    count = serializer.as_json.keys.count
+    difference = count - 40
+
+    expect(difference).to eq(0), lambda {
+      message = ""
+
+      if difference < 0
+        message << "#{difference * -1} key(s) have been removed from this serializer."
+      else
+        message << "#{difference} key(s) have been added to this serializer."
+      end
+
+      message << "\nPlease verify if those key(s) are required as part of the web hook's payload."
+    }
+  end
+end