Improving the readability of Capybara tests

I'm writing a rspec/capybara test that ensures input fields in a form display the correct validations.

I'm concerned that my code is not very readable. How can I refactor this to make sure that it's readable?

describe "#page" do
  context "form validation" do
    1.upto(4) do |index|
      it "throws correct validation error when #{5-index} field(s) is (are) empty" do
        login(page_path)
        fill_in_form(index)
        find('.button').trigger(:click)
        expect(all('.form-error').count).to eq 5-index
        all('.form-error')[-1...index-5].each do |error|
          expect(error.text).to eq "#{@inputs[5-index][:error_message]} is required"
        end
      end
    end
  end
end


def fill_in_form(number_of_fields)
  (0).upto(number_of_fields-1) do |i|
    fill_in(@inputs[i][:name], :with => (@inputs[i][:value]))
  end
end

def login(path)
  visit(path)
  # redirected to login
  acceptance_login(@user)
  visit(path)
  # input fields
  @inputs = [
    {name: 'first_name', error_message: "First name is not valid", value: "John"},
    {name: 'last_name', error_message: "Last name is not valid", value: "Doe"},
    {name: 'company', error_message: "Company name is not valid", value: "My company"},
    {name: 'role', error_message: "Role is not valid", value: "Developer"},
    {name: 'phone', error_message: "Phone number is not valid", value: "(800) 492-1111"}
  ]
end