Add spec to capture extant excluded_files behavior.

Author: fhwang

spec/cc/engine/csslint_spec.rb

@@ -5,24 +5,43 @@ module CC
   module Engine
     describe CSSlint do
       let(:code) { Dir.mktmpdir }
-      let(:lint) { CSSlint.new(directory: code, io: nil, engine_config: {}) }
-      let(:content) { '#id { color: red; }' }
+      let(:engine_config) { {} }
+      let(:lint) do
+        CSSlint.new(directory: code, io: nil, engine_config: engine_config)
+      end
+      let(:id_selector_content) { '#id { color: red; }' }
 
       describe '#run' do
         it 'analyzes *.css files' do
-          create_source_file('foo.css', content)
+          create_source_file('foo.css', id_selector_content)
           expect{ lint.run }.to output(/Don't use IDs in selectors./).to_stdout
         end
 
         it "doesn't analyze *.scss files" do
-          create_source_file('foo.scss', content)
+          create_source_file('foo.scss', id_selector_content)
           expect{ lint.run }.to_not output.to_stdout
         end
 
-        def create_source_file(path, content)
-          File.write(File.join(code, path), content)
+        describe "with exclude_paths" do
+          let(:engine_config) { {"exclude_paths" => %w(excluded.css)} }
+
+          before do
+            create_source_file("not_excluded.css", "p { margin: 5px }")
+            create_source_file("excluded.css", id_selector_content)
+          end
+
+          it "excludes all matching paths" do
+            expect{ lint.run }.not_to \
+              output(/Don't use IDs in selectors./).to_stdout
+          end
         end
       end
+
+      def create_source_file(path, content)
+        abs_path = File.join(code, path)
+        FileUtils.mkdir_p(File.dirname(abs_path))
+        File.write(abs_path, content)
+      end
     end
   end
 end