Add PreferencesHelper module

Consolidates the helpers related to user preferences.

Renames `app_theme` to `user_application_theme` to better explain what
it is.

1 files changed, 53 insertions, 0 deletions

diff --git a/spec/helpers/preferences_helper_spec.rb b/spec/helpers/preferences_helper_spec.rb
new file mode 100644
index 00000000000..095b016e6ec
--- /dev/null
+++ b/spec/helpers/preferences_helper_spec.rb
@@ -0,0 +1,53 @@
+require 'spec_helper'
+
+describe PreferencesHelper do
+  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'
+      end
+
+      it 'returns the default when id is invalid' do
+        user = double('user', theme_id: Gitlab::Themes::THEMES.size + 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'
+      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
+      end
+    end
+  end
+
+  describe 'user_color_scheme_class' do
+    context 'with current_user is nil' do
+      it 'should return a string' do
+        allow(self).to receive(:current_user).and_return(nil)
+        expect(user_color_scheme_class).to be_kind_of(String)
+      end
+    end
+
+    context 'with a current_user' do
+      (1..5).each do |color_scheme_id|
+        context "with color_scheme_id == #{color_scheme_id}" do
+          it 'should return a string' do
+            current_user = double(:color_scheme_id => color_scheme_id)
+            allow(self).to receive(:current_user).and_return(current_user)
+            expect(user_color_scheme_class).to be_kind_of(String)
+          end
+        end
+      end
+    end
+  end
+end