```ruby
require 'spec_helper'

RSpec.describe Alchemy::Admin::UsersController, type: :request do
  before do
    authorize_user create(:alchemy_admin_user)
  end

  context 'with error happening while sending mail' do
    before do
      allow_any_instance_of(Alchemy::Admin::BaseController).
        to receive(:raise_exception?) { false }
      allow_any_instance_of(Alchemy::User).
        to receive(:deliver_welcome_mail) { raise(Net::SMTPAuthenticationError) }
    end

    context 'on create' do
      it 'does not raise DoubleRender error' do
        expect {
          post admin_users_path, user: attributes_for(:alchemy_user).merge(send_credentials: '1')
        }.to_not raise_error
      end
    end

    context 'on update' do
      it 'does not raise DoubleRender error' do
        user =  create(:alchemy_member_user)
        expect {
          patch admin_user_path(user), user: {send_credentials: '1'}
        }.to_not raise_error
      end
    end
  end

  context 'with Alchemy.admin_path customised' do
    before(:all) do
      Alchemy.admin_path = '/backend'
      Rails.application.reload_routes!
    end

    it 'uses the custom admin path' do
      expect(admin_users_path).to eq('/backend/users')
    end


    after(:all) do
      Alchemy.admin_path = '/admin'
      Rails.application.reload_routes!
    end
  end
end
```

Fix syntax of Rails request helpers
user
```ruby
require 'spec_helper'

RSpec.describe Alchemy::Admin::UsersController, type: :request do
  before do
    authorize_user create(:alchemy_admin_user)
  end

  context 'with error happening while sending mail' do
    before do
      allow_any_instance_of(Alchemy::Admin::BaseController).
        to receive(:raise_exception?) { false }
      allow_any_instance_of(Alchemy::User).
        to receive(:deliver_welcome_mail) { raise(Net::SMTPAuthenticationError) }
    end

    context 'on create' do
      it 'does not raise DoubleRender error' do
        expect {
          post admin_users_path, params: {user: attributes_for(:alchemy_user).merge(send_credentials: '1')}
        }.to_not raise_error
      end
    end

    context 'on update' do
      it 'does not raise DoubleRender error' do
        user =  create(:alchemy_member_user)
        expect {
          patch admin_user_path(user), params: {user: {send_credentials: '1'}}
        }.to_not raise_error
      end
    end
  end

  context 'with Alchemy.admin_path customised' do
    before(:all) do
      Alchemy.admin_path = '/backend'
      Rails.application.reload_routes!
    end

    it 'uses the custom admin path' do
      expect(admin_users_path).to eq('/backend/users')
    end


    after(:all) do
      Alchemy.admin_path = '/admin'
      Rails.application.reload_routes!
    end
  end
end
```
assistant