DEV: Clear `ColorScheme.hex_cache` to avoid leaking state.

spec/models/color_scheme_color_spec.rb

@@ -1,6 +1,10 @@
 require 'rails_helper'
 
 describe ColorSchemeColor do
+  after do
+    ColorScheme.hex_cache.clear
+  end
+
   def test_invalid_hex(hex)
     c = described_class.new(hex: hex)
     expect(c).not_to be_valid

spec/models/color_scheme_spec.rb

@@ -1,8 +1,12 @@
 require 'rails_helper'
 
 describe ColorScheme do
+  after do
+    ColorScheme.hex_cache.clear
+  end
 
   let(:valid_params) { { name: "Best Colors Evar", colors: valid_colors } }
+
   let(:valid_colors) { [
     { name: '$primary_background_color', hex: 'FFBB00' },
     { name: '$secondary_background_color', hex: '888888' }

spec/models/topic_spec.rb

@@ -1040,9 +1040,14 @@ describe Topic do
 
       it "resets the topic archetype" do
         topic.expects(:add_moderator_post)
-        MessageBus.expects(:publish).with("/site/banner", nil)
-        topic.remove_banner!(user)
+
+        message = MessageBus.track_publish do
+          topic.remove_banner!(user)
+        end.first
+
         expect(topic.archetype).to eq(Archetype.default)
+        expect(message.channel).to eq("/site/banner")
+        expect(message.data).to eq(nil)
       end
 
     end

spec/rails_helper.rb

@@ -134,7 +134,6 @@ RSpec.configure do |config|
 
     unfreeze_time
     ActionMailer::Base.deliveries.clear
-    ColorScheme.hex_cache.clear
 
     raise if ActiveRecord::Base.connection_pool.stat[:busy] > 1
   end