Remove warnings "instance variable @{ivar} not initialized" in spec

spec/helper.rb

@@ -27,6 +27,10 @@ class ExampleStrategy
   option :name, 'test'
   def call(env); self.call!(env) end
   attr_reader :last_env
+  def initialize(*args, &block)
+    super
+    @fail = nil
+  end
   def request_phase
     @fail = fail!(options[:failure]) if options[:failure]
     @last_env = env

spec/omniauth/strategy_spec.rb

@@ -246,6 +246,10 @@ describe OmniAuth::Strategy do
   end
 
   describe "#call" do
+    before(:all) do
+      @options = nil
+    end
+
     let(:strategy){ ExampleStrategy.new(app, @options || {}) }
 
     context "omniauth.origin" do