Kill all mutants i Zero::Request

Fix tests for PATCH, because spec_helper didn't support it and the tests where
wrong.
Remove if statement from "conent_type", because ruby already returns nil, if the
requested key in a hash is not found. (Sounds a bit ugly, but it's true.)

lib/zero/request.rb

@@ -56,7 +56,7 @@ module Zero
     # TODO change into its own object?
     # @return [String] returns the content type of the request
     def content_type
-      @env[CONST_CONTENT_TYPE] if @env.has_key?(CONST_CONTENT_TYPE)
+      @env[CONST_CONTENT_TYPE]
     end
 
     # get the media types

spec/spec_helper.rb

@@ -40,6 +40,7 @@ class EnvGenerator
   KEY_REQUEST_POST   = 'POST'
   KEY_REQUEST_PUT    = 'PUT'
   KEY_REQUEST_DELETE = 'DELETE'
+  KEY_REQUEST_PATCH  = 'PATCH'
 
   def self.generate_env(uri, options)
     Rack::MockRequest.env_for(uri, options)
@@ -64,4 +65,8 @@ class EnvGenerator
   def self.delete(uri, options = {})
     generate_env(uri, options.merge(KEY_REQUEST_METHOD => KEY_REQUEST_DELETE))
   end
+
+  def self.patch(uri, options = {})
+    generate_env(uri, options.merge(KEY_REQUEST_METHOD => KEY_REQUEST_PATCH))
+  end
 end

spec/unit/request/patch_spec.rb

@@ -3,13 +3,13 @@ require 'spec_helper'
 describe Zero::Request, '#patch?' do
   subject { Zero::Request.new(env) }
 
-  context "with a post request" do
-    let(:env) { EnvGenerator.post('/foo') }
-    its(:post?) { should be(true) }
+  context "with a patch request" do
+    let(:env) { EnvGenerator.patch('/foo') }
+    its(:patch?) { should be(true) }
   end
 
   context "with a get request" do
     let(:env) { EnvGenerator.get('/foo') }
-    its(:post?) { should be(false) }
+    its(:patch?) { should be(false) }
   end
 end