Add specs for no live reloading in production

* Add set_rack_env and reset_rack_env spec helpers

Author: Jake Boxer

spec/application_spec.rb

@@ -281,5 +281,63 @@
         expect(text_in(response.body, "h2")).to eql("Changed")
       end
     end
+
+    context "in production" do
+      before :each do
+        set_rack_env :production
+      end
+
+      after :each do
+        reset_rack_env
+      end
+
+      it "doesn't reload changed assets" do
+        root    = prepare_fixture(:assets)
+        app     = Hyperloop::Application.new(root)
+        request = Rack::MockRequest.new(app)
+
+        # 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 still 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: ?block/)
+        expect(response.body).not_to match(/display: ?inline/)
+      end
+
+      it "doesn't reload changed views" do
+        root    = prepare_fixture(:erb)
+        app     = Hyperloop::Application.new(root)
+        request = Rack::MockRequest.new(app)
+
+        # On the first request, <title> text should be "ERB"
+        response = request.get("/")
+        expect(response).to be_ok
+        expect(text_in(response.body, "title")).to eql("ERB")
+
+        # Load index.html.erb and change the title to "Changed"
+        index_file_path = File.join(root, "app", "views", "index.html.erb")
+        index_file_data = File.read(index_file_path)
+        index_file_data.sub!(/<h2>[^<]*<\/h2>/, "<h2>Changed</h2>")
+        File.write(index_file_path, index_file_data)
+
+        # On the second request, <title> text should still be "ERB"
+        response = request.get("/")
+        expect(response).to be_ok
+        expect(text_in(response.body, "title")).to eql("ERB")
+      end
+    end
   end
 end

spec/spec_helper.rb

@@ -42,6 +42,30 @@ def prepare_fixture(name)
     tmp_root
   end
 
+  # Public: Set the RACK_ENV environment variable back to whatever it was when
+  # the spec started running. If RACK_ENV wasn't set before the spec started
+  # running, it will be deleted.
+  #
+  # Returns nothing.
+  def reset_rack_env
+    if defined?(@old_rack_env)
+      ENV["RACK_ENV"] = @old_rack_env
+    else
+      ENV.delete("RACK_ENV")
+    end
+  end
+
+  # Public: Set the RACK_ENV environment variable to the specified value.
+  #
+  # name - Symbol environment name to set RACK_ENV to. Should be :development,
+  #        :test, or :production.
+  #
+  # Returns nothing.
+  def set_rack_env(name)
+    @old_rack_env = ENV["RACK_ENV"] if ENV.key?("RACK_ENV")
+    ENV["RACK_ENV"] = name.to_s
+  end
+
   def text_in(html_str, selector)
     node = html(html_str).at_css(selector)
     node && node.text