form_test_helper.rb

module FormTestHelper
  def assert_form(action, options = {}, &block)
    method = options.delete(:method) || :post

    if method == :put || method == :patch || method == :delete
      virtual_method, method = method, :post
      test_body = -> (*args) {
        assert_select "input[type='hidden'][name='_method']",
          value: virtual_method

        block.call(*args) if block
      }
    elsif method == :post
      test_body = -> (*args) {
        assert_select "input[name='_method']", count: 0

        block.call(*args) if block
      }
    else
      test_body ||= block
    end

    assert_select 'form[action=?][method=?]', action, method.to_s, options, &test_body
  end

  def assert_input(name, value = nil, type: :text, label: nil, labels: nil, with_errors: false, **options)
    options[:type ] = type
    options[:name ] = name
    options[:value] = value if value

    selector  = with_errors ? '.field_with_errors input' : 'input'
    selector += options.map { |k, v| "[#{k}=\"#{v}\"]" }.join

    assert_select selector

    if labels
      labels.each do |_id, label|
        assert_select 'label[for=?]', _id.to_s, text: label
      end
    elsif label
      _id = name.tr('[', '_').tr(']', '')
      assert_select 'label[for=?]', _id, text: label
    end
  end

  def assert_input_select(name, label: nil, options: nil, options_count: nil, with_errors: false, **other_options)
    selector  = with_errors ? ".field_with_errors " : ""
    selector += "select[name=?]"

    assert_select selector, name.to_s, **other_options do |node|
      if options
        Array(options).each do |option|
          value, text = option

          if text
            assert_option value, text
          else
            assert_option value
          end
        end
      end

      if options_count
        assert_equal options_count, node.css("option").count,
          "Wrong number of options"
      end

      yield(node) if block_given?
    end

    _id = name.tr('[', '_').tr(']', '')
    assert_select 'label[for=?]', _id, text: label if label
  end

  def assert_option(value, text = value.to_s)
    assert_select('option[value=?]', value.to_s, text: text)
  end

  def assert_selected_option(value, text = value.to_s)
    assert_select('option[selected=selected][value=?]', value.to_s, text: text)
  end

  def assert_submit_buttons(*button_texts)
    button_texts.each do |button_text|
      assert_select "input[type='submit'][name='commit'][value=?]", button_text
    end
  end
end