Extract Decorator Step Two

* Move conditional method into decorator

Author: jferris

example_app/app/models/survey.rb

@@ -16,14 +16,11 @@ def summaries_using(summarizer, options = {})
   private
 
   def summary_or_hidden_answer(summarizer, question, answered_by)
-    if hide_unanswered_question?(question, answered_by)
-      UnansweredQuestionHider.new.hide_answer_to_question(question)
+    hider = UnansweredQuestionHider.new
+    if hider.hide_unanswered_question?(question, answered_by)
+      hider.hide_answer_to_question(question)
     else
       question.summary_using(summarizer)
     end
   end
-
-  def hide_unanswered_question?(question, answered_by)
-    answered_by && !question.answered_by?(answered_by)
-  end
 end

example_app/app/models/unanswered_question_hider.rb

@@ -4,4 +4,8 @@ class UnansweredQuestionHider
   def hide_answer_to_question(question)
     Summary.new(question.title, NO_ANSWER)
   end
+
+  def hide_unanswered_question?(question, user)
+    user && !question.answered_by?(user)
+  end
 end

example_app/spec/models/unanswered_question_hider_spec.rb

@@ -11,3 +11,34 @@
     result.value.should eq UnansweredQuestionHider::NO_ANSWER
   end
 end
+
+describe UnansweredQuestionHider, '#hide_unanswered_question?' do
+  it 'returns true given a user without an answer' do
+    user = build_stubbed(:user)
+    question = stub_answered_question(user, false)
+    hider = UnansweredQuestionHider.new
+
+    hider.hide_unanswered_question?(question, user).should be_true
+  end
+
+  it 'returns false given a user with an answer' do
+    user = build_stubbed(:user)
+    question = stub_answered_question(user, true)
+    hider = UnansweredQuestionHider.new
+
+    hider.hide_unanswered_question?(question, user).should be_false
+  end
+
+  it 'returns false without a user' do
+    question = build_stubbed(:question)
+    hider = UnansweredQuestionHider.new
+
+    hider.hide_unanswered_question?(question, nil).should be_false
+  end
+
+  def stub_answered_question(user, answered)
+    build_stubbed(:question).tap do |question|
+      question.stubs(:answered_by?).with(user).returns(answered)
+    end
+  end
+end