Setup basic test

spec/gemrat_spec.rb

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+require 'spec_helper'
+describe Gemrat do
+  before do
+    test_gemfile = File.new("TestGemfile", "w")
+    test_gemfile.puts ("https://rubygems.org'\n\n# Specify your gem's dependencies in gemrat.gemspec\ngem 'rspec', '2.13.0'\n")
+    test_gemfile.close
+  end
+
+  after do
+    File.delete("TestGemfile")
+  end
+
+  it "example" do
+    `gemrat sinatra`
+    gemfile_contents = File.open('TestGemfile').read
+    gemfile_contents.should include("gem 'sinatra', '1.4.2'")
+  end
+end

spec/spec_helper.rb

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+require 'rubygems'
+require 'bundler/setup'
+
+require 'gemrat' # and any other gems you need
+require 'pry'
+
+RSpec.configure do |config|
+  # some (optional) config here
+end