Regression spec to make sure I didn't break anything

spec/integration/rack/middleware_regression_spec.rb

@@ -3,25 +3,27 @@
 
 describe VersionCake::Rack::Middleware do
   let(:app) do
+    _config = config
     rack = Rack::Builder.new do
-      config = VersionCake::Configuration.new
-      config.resources { |r| r.resource %r{.*}, [], [], (1..5) }
-      use VersionCake::Rack::Middleware, config
-      run lambda { |env| [ 200, {},[ env['versioncake.context'].version ] ] }
+      use VersionCake::Rack::Middleware, _config
+      run lambda { |env| [ 200, {},[ "version is #{env['versioncake.context'].version}" ] ] }
     end
     Rack::MockRequest.new(rack)
   end
+  let(:config) do
+    config = VersionCake::Configuration.new
+    config.resources { |r| r.resource %r{.*}, [], [], (1..5) }
+    config
+  end
 
   test_cases = YAML.load(File.open('./spec/fixtures/test_cases.yml'))
   test_cases.each do |test_case|
     context 'for a test case' do
-
-
       let(:data) { test_case['request'] || {} }
       let(:method) { (data['method'] || 'get').to_sym }
       let(:headers) { data['headers'] || {} }
       let(:params) { data['params'] || {} }
-      let(:test_response) { test_case['response'] }
+      let(:test_response) { "version is #{test_case['response']}" }
 
       it "test yml test cases" do
         begin
@@ -40,4 +42,20 @@ def custom_message(headers, params, method, actual_response, expected_response)
     data << "params:#{params}" if params
     "Expected #{data.join(',')} with method #{method} to yield '#{expected_response}', but got '#{actual_response}'"
   end
+
+  context 'when configured with unversioned template' do
+    let(:config) do
+      config = VersionCake::Configuration.new
+      config.resources { |r| r.resource %r{.*}, [], [], (1..5) }
+      config.missing_version = :unversioned_template
+      config
+    end
+
+    context 'and the request does not contain a version' do
+      it 'does not include a version (rails will convert nil => unversioned template)' do
+        _response_status, _response_headers, response = app.request('get', '/renders')
+        expect(response.body).to eq 'version is ' # nil
+      end
+    end
+  end
 end