test: Add spec for BackDoor middleware

spec/dummy/application.rb

@@ -27,6 +27,8 @@ class Application < Rails::Application
     config.paths["log"] = "tmp/log/development.log"
     config.paths.add "config/routes.rb", with: "#{APP_ROOT}/config/routes.rb"
 
+    config.middleware.use Clearance::BackDoor
+
     def require_environment!
       initialize!
     end

spec/requests/backdoor_spec.rb

@@ -0,0 +1,11 @@
+require "spec_helper"
+
+describe "Backdoor Middleware" do
+  it "allows signing in using query parameter" do
+    user = create(:user)
+
+    get root_path(as: user.to_param)
+
+    expect(cookies["remember_token"]).to eq user.remember_token
+  end
+end