added specs for #preferred

spec/unit/request/accept/preferred_spec.rb

@@ -0,0 +1,36 @@
+require 'spec_helper'
+
+describe Zero::Request::Accept, '#preferred' do
+  subject { Zero::Request::Accept }
+  let(:html) { 'text/html' }
+  let(:json) { 'application/json' }
+  let(:foo)  { 'text/foo' }
+  let(:lower_quality) { foo + ';q=0.5' }
+  let(:default) { '*/*;q=0.1' }
+  let(:simple_accept)  { [html, json].join(',') }
+  let(:quality_accept) { [html, lower_quality, default].join(',') }
+  let(:random_accept)  { [lower_quality, default, html].join(',') }
+  let(:lower_accept)   { [lower_quality, default].join(',') }
+  
+  context 'without mapping' do
+    before :each do
+      # reset the mapping to nothing
+      Zero::Request::Accept.map = {}
+    end
+
+    it { subject.new(html).preferred.should           == html }
+    it { subject.new(json).preferred.should           == json }
+    it { subject.new(simple_accept).preferred.should  == html }
+    it { subject.new(quality_accept).preferred.should == html }
+    it { subject.new(random_accept).preferred.should  == html }
+    it { subject.new(lower_accept).preferred.should   == foo }
+  end
+
+  context 'with mapping' do
+    before :all do
+      Zero::Request::Accept.map = {'text/html' => 'html'}
+    end
+
+    it { subject.new(html).preferred.should == 'html' }
+  end
+end