Fix failing spec on line_comments

Author: hexgnu

test/sassc_rails_test.rb

@@ -43,6 +43,7 @@ def initialize!
 
   def initialize_dev!
     Rails.env = "development"
+    Dir.chdir(File.join(File.dirname(__FILE__), '../../../'))
     @app.initialize!
   end
 
@@ -166,6 +167,7 @@ def test_line_comments_active_in_dev
     initialize_dev!
 
     css_output = render_asset("css_scss_handler.css")
+
     assert_match %r{/* line 1}, css_output
     assert_match %r{.+/sassc-rails/test/dummy/app/assets/stylesheets/css_scss_handler.css.scss}, css_output
   end
@@ -191,7 +193,7 @@ def test_css_compressor_config_item_is_honored_if_not_development_mode
   def test_css_compressor_config_item_may_be_nil_in_test_mode
     @app.config.assets.css_compressor = nil
     initialize!
-    assert_equal nil, Rails.application.config.assets.css_compressor
+    assert_nil Rails.application.config.assets.css_compressor
   end
 
   def test_css_compressor_is_defined_in_test_mode