Re-add user_color_scheme helper

Update PreferencesHelper specs

app/helpers/preferences_helper.rb

@@ -30,7 +30,11 @@ module PreferencesHelper
   end
 
   def user_application_theme
-    Gitlab::Themes.by_id(current_user.try(:theme_id)).css_class
+    Gitlab::Themes.for_user(current_user).css_class
+  end
+
+  def user_color_scheme
+    Gitlab::ColorSchemes.for_user(current_user).css_class
   end
 
   def prefer_readme?

spec/helpers/preferences_helper_spec.rb

 require 'spec_helper'
 
 describe PreferencesHelper do
+  describe 'dashboard_choices' do
+    it 'raises an exception when defined choices may be missing' do
+      expect(User).to receive(:dashboards).and_return(foo: 'foo')
+      expect { helper.dashboard_choices }.to raise_error(RuntimeError)
+    end
+
+    it 'raises an exception when defined choices may be using the wrong key' do
+      expect(User).to receive(:dashboards).and_return(foo: 'foo', bar: 'bar')
+      expect { helper.dashboard_choices }.to raise_error(KeyError)
+    end
+
+    it 'provides better option descriptions' do
+      expect(helper.dashboard_choices).to match_array [
+        ['Your Projects (default)', 'projects'],
+        ['Starred Projects',        'stars']
+      ]
+    end
+  end
+
   describe 'user_application_theme' do
     context 'with a user' do
       it "returns user's theme's css_class" do
-        user = double('user', theme_id: 3)
-        allow(self).to receive(:current_user).and_return(user)
-        expect(user_application_theme).to eq 'ui_green'
+        stub_user(theme_id: 3)
+
+        expect(helper.user_application_theme).to eq 'ui_green'
       end
 
       it 'returns the default when id is invalid' do
-        user = double('user', theme_id: Gitlab::Themes::THEMES.size + 5)
+        stub_user(theme_id: Gitlab::Themes.count + 5)
 
         allow(Gitlab.config.gitlab).to receive(:default_theme).and_return(2)
-        allow(self).to receive(:current_user).and_return(user)
 
-        expect(user_application_theme).to eq 'ui_charcoal'
+        expect(helper.user_application_theme).to eq 'ui_charcoal'
       end
     end
 
     context 'without a user' do
-      before do
-        allow(self).to receive(:current_user).and_return(nil)
-      end
-
       it 'returns the default theme' do
-        expect(user_application_theme).to eq Gitlab::Themes.default.css_class
+        stub_user
+
+        expect(helper.user_application_theme).to eq Gitlab::Themes.default.css_class
       end
     end
   end
 
-  describe 'dashboard_choices' do
-    it 'raises an exception when defined choices may be missing' do
-      expect(User).to receive(:dashboards).and_return(foo: 'foo')
-      expect { dashboard_choices }.to raise_error(RuntimeError)
+  describe 'user_color_scheme' do
+    context 'with a user' do
+      it "returns user's scheme's css_class" do
+        allow(helper).to receive(:current_user).
+          and_return(double(color_scheme_id: 3))
+
+        expect(helper.user_color_scheme).to eq 'solarized-light'
       end
 
-    it 'raises an exception when defined choices may be using the wrong key' do
-      expect(User).to receive(:dashboards).and_return(foo: 'foo', bar: 'bar')
-      expect { dashboard_choices }.to raise_error(KeyError)
+      it 'returns the default when id is invalid' do
+        allow(helper).to receive(:current_user).
+          and_return(double(color_scheme_id: Gitlab::ColorSchemes.count + 5))
+      end
     end
 
-    it 'provides better option descriptions' do
-      expect(dashboard_choices).to match_array [
-        ['Your Projects (default)', 'projects'],
-        ['Starred Projects',        'stars']
-      ]
+    context 'without a user' do
+      it 'returns the default theme' do
+        stub_user
+
+        expect(helper.user_color_scheme).
+          to eq Gitlab::ColorSchemes.default.css_class
+      end
+    end
+  end
+
+  def stub_user(messages = {})
+    if messages.empty?
+      allow(helper).to receive(:current_user).and_return(nil)
+    else
+      allow(helper).to receive(:current_user).
+        and_return(double('user', messages))
     end
   end
 end