Add live asset reloading spec

Author: Jake Boxer

spec/application_spec.rb

@@ -196,6 +196,28 @@
       @request = Rack::MockRequest.new(@app)
     end
 
+    it "reloads assets when they're changed" do
+      # On the first request, stylesheet should have `display: block;` and not
+      # `display: inline;`.
+      response = @request.get("/assets/stylesheets/app.css")
+      expect(response).to be_ok
+      expect(response.body).to match(/display: ?block;/)
+      expect(response.body).not_to match(/display: ?inline;/)
+
+      # Load layout and change the title to "Changed"
+      asset_path = File.join(@root, "app", "assets", "stylesheets", "my-styles.scss")
+      asset_data = File.read(asset_path)
+      asset_data.sub!("display: block;", "display: inline;")
+      File.write(asset_path, asset_data)
+
+      # On the second request, stylesheet should have `display: inline;` and not
+      # `display: block;`.
+      response = @request.get("/assets/stylesheets/app.css")
+      expect(response).to be_ok
+      expect(response.body).to match(/display: ?inline;/)
+      expect(response.body).not_to match(/display: ?block;/)
+    end
+
     it "reloads layouts when they're changed" do
       # On the first request, <title> text should not be "Changed"
       response = @request.get("/")