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I am learning to write feature specs using rspec and capybara. I am trying to write spec for an application, which handles transactions. My transaction controller is as follows:

 def new
 @transaction = Transaction.new
 end

 def create
 transaction = Transaction.new(transaction_params)
 transaction.account = current_account
 if transaction.save && transaction.account.save
 flash[:success] = 'Transaction successfull'
 else
 flash[:danger] = 'Insufficient balance'
 end
 redirect_to root_path
 end

It's view is as follows transactions/new:

<div class = 'row'>
<div class = 'col-xs-12'>
 <%= form_for(@transaction, id: 'transaction_form', :html => class: 'form-horizontal', role: 'form') do |t| %>
 <div class = 'form-group'>
 <div class = 'control-label col-sm-2'>
 <%= t.label :amount %>
 </div>

 <div class = 'col-sm-8'>
 <%= t.text_field :amount, class: 'form-control', placeholder: 'Enter amount', autofocus: true %>
 </div>
 </div>

 <div class = 'form-group'>
 <div class = 'control-label col-sm-2'>
 <%= t.label :transaction_type %>
 </div>

 <div class = 'col-sm-8'>
 <%= t.select :transaction_type, Transaction.transaction_types.keys %>
 </div>
 </div>

 <div class = 'form-group'>
 <div class = 'col-sm-offset-2 col-sm-10'>
 <%= t.submit 'Submit', class: 'btn btn-primary btn' %>
 </div>
 </div>
<% end %>

I added id: transaction_form to form to avoid ambiguous error.
The spec code is as follows:

RSpec.feature 'Transactions', type: :feature do
context 'create new transaction' do
scenario 'should be successfull' do
 visit new_transaction_path
 within('#transaction_form') do
 fill_in 'Amount', with: '60'
 end
 click_button 'Submit'
 expect(page).to have_content('Transaction successfull')
end
end
end

On running this spec, however,I get error as:

 1) Transactions create new transaction should be successfull
 Failure/Error:
 within('#transaction_form') do
 fill_in 'Amount', with: '60'
 end

 Capybara::ElementNotFound:
 Unable to find css "#transaction_form"

What is it I am missing? If I use form directly, it is throwing the ambiguous error as it is getting the same element from different file. What is wrong with this code?

Also, the /transactions/new page will be displayed only if the user is logged in. So will this also affect the transaction spec? If yes, then what should be done?

Please help. Thanks in advance.

If the page you want to interact with is only visible when the user is logged in, then you need to log the user in. That also means you will need to create the user you're going to log in before the test starts. Usually that would be done using either Rails fixtures, or a factory (like the factory_bot gem). Once you have create the user then you'll need to log them in, which can be as simple as visiting the login page and entering the users username and password. If you're using a gem for authentication it may provide a test mode which allows for bypassing actually visiting the login page in order to speed up tests (ie. devise provides this - https://github.com/plataformatec/devise/wiki/How-To:-Test-with-Capybara)