Clean out Sass tests that we don't need anymore.

Ref: #2098

test/test_sass.rb

@@ -37,62 +37,6 @@ body {\n  font-family: Helvetica, sans-serif;\n  font-color: fuschia; }
 CSS
   end
 
-  context "matching file extensions" do
-    should "match .scss files" do
-      assert converter.matches(".scss")
-    end
-
-    should "match .sass files" do
-      assert converter.matches(".sass")
-    end
-  end
-
-  context "determining the output file extension" do
-    should "always outputs the .css file extension" do
-      assert_equal ".css", converter.output_ext(".always-css")
-    end
-  end
-
-  context "when building configurations" do
-    should "not allow caching in safe mode" do
-      verter = converter
-      verter.instance_variable_get(:@config)["safe"] = true
-      assert_equal false, verter.sass_configs[:cache]
-    end
-
-    should "allow caching in unsafe mode" do
-      assert_equal true, converter.sass_configs[:cache]
-    end
-
-    should "set the load paths to the _sass dir relative to site source" do
-      assert_equal [source_dir("_sass")], converter.sass_configs[:load_paths]
-    end
-
-    should "allow the user to specify a different sass dir" do
-      assert_equal [source_dir("_scss")], converter({"sass_dir" => "_scss"}).sass_configs[:load_paths]
-    end
-
-    should "set syntax :scss when SCSS content" do
-      assert_equal :scss, converter.sass_configs(scss_content)[:syntax]
-    end
-
-    should "set syntax :sass when Sass content" do
-      assert_equal :sass, converter.sass_configs(sass_content)[:syntax]
-    end
-
-    should "default to :sass syntax when content is empty" do
-      assert_equal :sass, converter.sass_configs[:syntax]
-    end
-
-    should "not allow sass_dirs outside of site source" do
-      assert_equal source_dir("etc/passwd"), converter({"sass_dir" => "/etc/passwd"}).sass_dir_relative_to_site_source
-    end
-
-    should "override user-set syntax based on content" do
-      assert_equal :sass, converter({"syntax" => :scss}).sass_configs(sass_content)[:syntax]
-    end
-  end
-
   context "converting sass" do
     should "produce CSS" do
       assert_equal css_output, converter.convert(sass_content)