Redirect to account page if editing own user email

c.f. `redirect_to_account_page_if_acting_on_own_user` before action in
`UsersController`.

In this case it makes sense to redirect to the specific account page for
editing email address.

app/controllers/users/emails_controller.rb

@@ -4,6 +4,7 @@ class Users::EmailsController < ApplicationController
   before_action :authenticate_user!
   before_action :load_user
   before_action :authorize_user
+  before_action :redirect_to_account_page_if_acting_on_own_user, only: %i[edit]
 
   def edit; end
 
@@ -51,4 +52,8 @@ def user_params
   def permitted_user_params
     @permitted_user_params ||= params.require(:user).permit(:email).to_h
   end
+
+  def redirect_to_account_page_if_acting_on_own_user
+    redirect_to edit_account_email_path if current_user == @user
+  end
 end

test/controllers/users/emails_controller_test.rb

@@ -7,7 +7,8 @@ class Users::EmailsControllerTest < ActionController::TestCase
   context "GET edit" do
     context "signed in as Admin user" do
       setup do
-        sign_in(create(:admin_user))
+        @admin = create(:admin_user)
+        sign_in(@admin)
       end
 
       should "display form with email field" do
@@ -53,6 +54,12 @@ class Users::EmailsControllerTest < ActionController::TestCase
 
         assert_not_authorised
       end
+
+      should "redirect to account edit email page if admin is acting on their own user" do
+        get :edit, params: { user_id: @admin }
+
+        assert_redirected_to edit_account_email_path
+      end
     end
 
     context "signed in as Normal user" do