Fix some test errors that occur when gems are missing.

features/step_definitions/command_line_steps.rb

@@ -36,8 +36,12 @@ end
 
 Given /^I'm in a newly created rails project: (.+)$/ do |project_name|
   @cleanup_directories << project_name
+  begin
     generate_rails_app project_name
     Dir.chdir project_name
+  rescue LoadError
+    pending "Missing Ruby-on-rails gems: sudo gem install rails"
+  end
 end
 
 # When Actions are performed
@@ -173,7 +177,11 @@ Then /^the following configuration properties are set in ([^ ]+):$/ do |config_f
 end
 
 Then /^my css is validated$/ do
+  if @last_error =~ /The Compass CSS Validator could not be loaded/
+    pending "Missing Dependency: sudo gem install chriseppstein-compass-validator"
+  else
     @last_result.should =~ /Compass CSS Validator/
+  end
 end
 
 Then /^I am informed that my css is valid.$/ do

lib/compass/errors.rb

@@ -4,4 +4,7 @@ module Compass
 
   class FilesystemConflict < Error
   end
+
+  class MissingDependency < Error
+  end
 end

lib/compass/validator.rb

@@ -2,9 +2,8 @@ begin
   require 'rubygems'
   require 'compass-validator'
 rescue LoadError
-  puts %Q{The Compass CSS Validator could not be loaded. Please install it:
+  raise Compass::MissingDependency, %Q{The Compass CSS Validator could not be loaded. Please install it:
 
 sudo gem install chriseppstein-compass-validator --source http://gems.github.com/
 }
-  exit(1)
 end

test/command_line_helper.rb

@@ -1,3 +1,5 @@
+require 'timeout'
+
 module Compass::CommandLineHelper
   def compass(*arguments)
     options = arguments.last.is_a?(Hash) ? arguments.pop : {}

test/rails_helper.rb

@@ -28,7 +28,7 @@ module Compass
             Rails::Generator::Scripts::Generate.new.run([name], :generator => 'app')
           end
         rescue LoadError
-          Kernel.exit(2)
+          Kernel.exit!(2)
         rescue => e
           $stderr.puts e
           Kernel.exit!(1)