split up answer validation test into themed files

test/test_helpers/README.txt

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+Use this folder to store mocks, stubs, etc to make isolated testing possible.
+
+Some definitions borrowed from:
+http://martinfowler.com/articles/mocksArentStubs.html
+
+* Dummy
+  objects are passed around but never actually used.
+  Usually they are just used to fill parameter lists.
+
+* Fake
+  objects actually have working implementations, but usually
+  take some shortcut which makes them not suitable for
+  production (an in memory database is a good example).
+
+* Stubs
+  provide canned answers to calls made during the test,
+  usually not responding at all to anything outside what's
+  programmed in for the test. Stubs may also record information
+  about calls, such as an email gateway stub that remembers the
+  messages it 'sent', or maybe only how many messages it 'sent'.
+
+* Mocks
+  objects pre-programmed with expectations which form a
+  specification of the calls they are expected to receive.
+

test/test_helpers/answer_validatable.rb

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+class AnswerValidatable
+  include ActiveModel::Validations
+
+  attr_accessor :answer
+  attr_accessor :question
+
+  validates :answer, answer_format: true
+
+  MockQuestion = Struct.new(:input_type)
+
+  def initialize input_type
+    @input_type = input_type
+  end
+
+  def question
+    MockQuestion.new(@input_type)
+  end
+end