redirect back to request after login

completes #94

app/controllers/admin/auth_controller.rb

@@ -15,7 +15,7 @@ module Admin
 
       if user && user.authenticate(auth_params[:password])
         session[:user] = user.to_i
-        redirect_to admin_path
+        redirect_to session[:request] || admin_path
       else
         redirect_to admin_login_path,
                     flash: { error: "Sorry, incorrect email or password. Please try again." }

app/controllers/admin_controller.rb

@@ -17,6 +17,7 @@ class AdminController < ApplicationController
   private
 
     def authorize_user
+      session[:request] = request.fullpath
       redirect_to admin_login_path unless current_user
     end
 

test/controllers/admin/auth_controller_test.rb

@@ -26,6 +26,18 @@ module Admin
       assert_redirected_to admin_url
     end
 
+    test "should auth to original request" do
+      elsie = candidates(:elsie)
+
+      get admin_result_url(test_hash: elsie.test_hash)
+
+      assert_redirected_to admin_login_url
+      post admin_auth_url, params: { auth:
+          { email: 'fed.reviewer@mailinator.com', password: 'password' } }
+
+      assert_redirected_to admin_result_url(test_hash: elsie.test_hash)
+    end
+
     test "should FAIL auth" do
       post admin_auth_url, params: { auth:
           { email: 'alan.admin@mailinator.com', password: 'b@d9a$$werD' } }