rearrange the furniture on the Rake task test a little bit

spec/lib/jasmine/headless/task_spec.rb

@@ -5,26 +5,35 @@ require 'jasmine/headless/task'
 module Jasmine
   module Headless
     class Task
-      def desc(block)
-      end
-      def task(block)
-      end
+      def desc(block); end
+      def task(block); end
     end
   end
 end
+
 describe Jasmine::Headless::Task do
-  it 'should not explode when Rails is undefined' do
+  after do
     Object.send(:remove_const, :Rails) if defined?(Rails)
-    Jasmine::Headless::Task.new('jasmine:headless') do |t|
+  end
+
+  context 'without Rails' do
+    it 'should not explode when Rails is undefined' do
+      Jasmine::Headless::Task.new('jasmine:headless')
     end
   end
-  it 'should be OK if rails is defined' do
+
+  context 'with Rails' do
+    before do
       module Rails
         def self.version
           return "0"
         end
       end
-    Jasmine::Headless::Task.new('jasmine:headless') do |t|
+    end
+
+    it 'should be OK if rails is defined' do
+      Jasmine::Headless::Task.new('jasmine:headless')
     end
   end
 end
+