added a basic spec for the controller

spec/unit/controller/call_spec.rb

@@ -0,0 +1,14 @@
+require 'spec_helper'
+
+describe Zero::Controller, '.call' do
+  subject { SpecController.call(env) }
+  let(:env) { EnvGenerator.get('/foo') }
+
+  it "returns a response" do
+    subject.should be_respond_to(:to_a)
+  end
+
+  it "returns an object with the first element being a status" do
+    subject[0].should be_kind_of(Numeric)
+  end
+end