Rails: assert_select 在测试具有数值的属性时给出 nokogiri 错误

Question

在我的 rails 集成测试中，我试图测试是否存在具有给定值（即对象 ID，整数）的复选框。

此行：assert_select "input[type=checkbox][value=#{c.id.to_s}]" 生成以下错误：

Nokogiri::CSS::SyntaxError: unexpected '283557850' after 'equal'

(283557850 is the ID of the object).

令人困惑的是，我只在测试数值时遇到此错误。如果我输入一些字母，例如 assert_select "input[type=checkbox][value=test#{c.id.to_s}]"，我将不再收到该错误（显然测试失败，因为我的复选框的值实际上不是“test283557850”）。

有什么想法吗？

Answer 1

附件是我的assert_xpath。它比 assert_select 更好，因为 XPath 将 XML 视为可以进行任意复杂查询的数据库。

您的查询将是 assert_xpath "//input[@type='checkbox' and @value='#{c.id.to_s}']"，或者更好的是 assert_xpath '//input[@type="checkbox" and @value=$value]', value: c.id.to_s。

assert_xpath也可以嵌套。例如：

assert_xpath '//label[ contains(text(), "Group:") ]' do
  assert_xpath 'select[ "group_id" = @name ]' do
    assert_xpath 'option[ "Anonymous users" = text() and "13" = @value ]'
    assert_xpath 'option[ "B Team" = text() and "11" = @value and "selected" = @selected ]'
  end
end

将此粘贴到您的 test_helper.rb 文件中：

class ActiveSupport::TestCase

  def assert_xml(xml)
    @xdoc = Nokogiri::XML(xml, nil, nil, Nokogiri::XML::ParseOptions::STRICT)
    refute_nil @xdoc
    return @xdoc
  end

  def assert_html(html=nil)
    html ||= @response.body
    @xdoc = Nokogiri::HTML(html, nil, nil, Nokogiri::XML::ParseOptions::STRICT)
    refute_nil @xdoc
    return @xdoc
  end

  def assert_xpath(path, replacements={}, &block)
    @xdoc ||= nil  #  Avoid a dumb warning
    @xdoc or assert_html  #  Because assert_html snags @response.body for us
    element = @xdoc.at_xpath(path, nil, replacements)

    unless element
      complaint = "Element expected in:\n`#{@xdoc}`\nat:\n`#{path}`"
      replacements.any? and complaint += "\nwith: " + replacements.pretty_inspect
      raise Minitest::Assertion, complaint
    end

    if block
      begin
        waz_xdoc = @xdoc
        @xdoc = element
        block.call(element)
      ensure
        @xdoc = waz_xdoc
      end
    end

    return element
  end

  def refute_xpath(path, replacements={}, &block)
    @xdoc ||= nil  #  Avoid a dumb warning
    @xdoc or assert_html  #  Because assert_html snags @response.body for us
    element = @xdoc.at_xpath(path, nil, replacements)

    if element
      complaint = "Element not expected in:\n`#{@xdoc}`\nat:\n`#{path}`"
      replacements.any? and complaint += "\nwith: " + replacements.pretty_inspect
      raise Minitest::Assertion, complaint
    end
  end

end

Answer 2

问题是 input[type=checkbox][value=123] 不是有效的 CSS 选择器。查询属性时，值必须以字母开头或用引号引起来。

assert_select "input[type=checkbox][value='#{c.id.to_s}']"

您可以使用浏览器控制台和 document.querySelectorAll().

解决此类问题

Rails: assert_select 在测试具有数值的属性时给出 nokogiri 错误

Rails: assert_select gives nokogiri error when testing for attribute with numeric value

integration-testing

ruby-on-rails

nokogiri