add tests to check for compilation errors with Sass

.gitignore

@@ -1,2 +1,2 @@
 *.gem
-
+.sass-cache

Rakefile

@@ -0,0 +1,8 @@
+require 'rake/testtask'
+Rake::TestTask.new do |t|
+  t.libs << "test"
+  t.test_files = FileList['test/*_test.rb']
+  t.verbose = true
+end
+
+task default: :test

test/compilation_test.rb

@@ -0,0 +1,11 @@
+require 'test_helper'
+
+class CompilationTest < Test::Unit::TestCase
+  def test_compilation
+    path = 'vendor/assets/stylesheets'
+    engine = Sass::Engine.for_file("#{path}/_bootstrap.scss", syntax: :scss, load_paths: [path])
+    assert_nothing_raised do
+      engine.render
+    end
+  end
+end

test/test_helper.rb

@@ -0,0 +1,7 @@
+$:.unshift("#{File.dirname(__FILE__)}/..")
+
+require 'test/unit'
+
+require 'sass'
+require 'lib/bootstrap-sass/compass_extensions'
+require 'lib/bootstrap-sass/rails_extentions'