Ensure that we actually create a spec_helper file.

Author: cupakromer

spec/generators/rspec/install/install_generator_spec.rb

@@ -11,6 +11,13 @@
     expect(file('.rspec')).to exist
   end
 
+  it "generates spec/spec_helper.rb" do
+    run_generator
+    expect(File.read( file('spec/spec_helper.rb') )).to match(
+      / This file was generated by the `rails generate rspec:install` command./m
+    )
+  end
+
   it "generates spec/rails_helper.rb" do
     run_generator
     expect(File.read( file('spec/rails_helper.rb') )).to match(/^require 'rspec\/rails'$/m)