ビューの仕様が一貫して動作しないのはなぜですか？

Question

は私が

Failure/Error: assert_select "div.fileinput-new.thumbnail" 
ArgumentError: 
    wrong number of arguments (3 for 1) 

[OK]をビューのスペックから、いくつかの奇妙な結果を得ているので、（私は参照3つの引数が何であるかわからないが）、これは自明です。

しかし、スイートをもう一度実行すると、エラーが発生する可能性があります。そして次の5つのエラーは、上記と同じタイプですが、異なるDOM要素を参照しています。

ビュー仕様の矛盾したカバレッジのこの種を引き起こす可能性がどのようなこれらの仕様

describe do 
    build :object/create :object 
    @object = assign(:object, object) 
    it 'displays the DOM elements' do 
    render 
    asset_select #DOM_elements 
    end 
end 

のいずれかで派手なものは何もありませんか？

これは決定的な答えではありません

Failure/Error: assert_select "div.fileinput-new.thumbnail" 

    ArgumentError: 
     wrong number of arguments (3 for 1) 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/actionview-4.2.6/lib/action_view/helpers/text_helper.rb:52:in `concat' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/searchable.rb:165:in `evaluate' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/searchable.rb:165:in `block in xpath' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/searchable.rb:156:in `map' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/searchable.rb:156:in `xpath' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/searchable.rb:193:in `css_internal' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/node_set.rb:76:in `block in css' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/node_set.rb:187:in `block in each' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/node_set.rb:186:in `upto' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/node_set.rb:186:in `each' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/node_set.rb:75:in `inject' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/nokogiri-1.6.7.2/lib/nokogiri/xml/node_set.rb:75:in `css' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rails-dom-testing-1.0.7/lib/rails/dom/testing/assertions/selector_assertions/html_selector.rb:20:in `select' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rails-dom-testing-1.0.7/lib/rails/dom/testing/assertions/selector_assertions.rb:174:in `assert_select' 
    # ./spec/views/users/settings/profile.html.erb_spec.rb:24:in `block (4 levels) in <top (required)>' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rails-dom-testing-1.0.7/lib/rails/dom/testing/assertions/selector_assertions.rb:295:in `nest_selection' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rails-dom-testing-1.0.7/lib/rails/dom/testing/assertions/selector_assertions.rb:177:in `block in assert_select' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rails-dom-testing-1.0.7/lib/rails/dom/testing/assertions/selector_assertions.rb:174:in `tap' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rails-dom-testing-1.0.7/lib/rails/dom/testing/assertions/selector_assertions.rb:174:in `assert_select' 
    # ./spec/views/users/settings/profile.html.erb_spec.rb:22:in `block (3 levels) in <top (required)>' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:236:in `instance_exec' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:236:in `block in run' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:478:in `block in with_around_and_singleton_context_hooks' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:435:in `block in with_around_example_hooks' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:478:in `block in run' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:618:in `block in run_around_example_hooks_for' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:320:in `call' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:320:in `call' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-rails-3.4.2/lib/rspec/rails/adapters.rb:127:in `block (2 levels) in <module:MinitestLifecycleAdapter>' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:425:in `instance_exec' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:425:in `instance_exec' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:389:in `execute_with' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:620:in `block (2 levels) in run_around_example_hooks_for' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:320:in `call' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:320:in `call' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:621:in `run_around_example_hooks_for' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/hooks.rb:478:in `run' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:435:in `with_around_example_hooks' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:478:in `with_around_and_singleton_context_hooks' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example.rb:233:in `run' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:581:in `block in run_examples' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:577:in `map' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:577:in `run_examples' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:543:in `run' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:544:in `block in run' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:544:in `map' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/example_group.rb:544:in `run' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:119:in `block (3 levels) in run_specs' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:119:in `map' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:119:in `block (2 levels) in run_specs' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/configuration.rb:1680:in `with_suite_hooks' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:118:in `block in run_specs' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/reporter.rb:77:in `report' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:117:in `run_specs' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:93:in `run' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:78:in `run' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/lib/rspec/core/runner.rb:45:in `invoke' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/gems/rspec-core-3.4.4/exe/rspec:4:in `<top (required)>' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/bin/rspec:23:in `load' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/bin/rspec:23:in `<main>' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/bin/ruby_executable_hooks:15:in `eval' 
    # /Users/me/.rvm/gems/ruby-2.2.3@myapp/bin/ruby_executable_hooks:15:in `<main>' 

Answer 1

例スタックトレース：いくつかの奇妙な理由で、鋸山のSearchableモジュールでevaluate methodがするのではなく、カスタムXPath関数としてconcat()の機能を考慮し、ことが表示されますinternal XPath function。

外部XPath関数はhandler属性のコンテキストでevaluateのコンテキストでcalled as normal ruby methodsです。通常はハンドラはSubstitutionContext classですが、場合によってはconcatメソッドが定義されているTextHelperモジュールのコンテキストを取得し、1つのパラメータを受け入れるようです（XPathのconcat()関数は任意の数のパラメータを受け入れます）。私はこれがあなたが観察するエラーにつながると思います。

this lineにsearchable.rbファイル（その場所はスタックトレースを参照）を開き、次の変数の内容を調べるためにいくつかのデバッグメッセージを追加できますか？

puts "ctx #{ctx.inspect}" 
puts "path #{path.inspect}" 
puts "handler #{handler.inspect}" 
if handler.respond_to?(:concat) 
    puts "concat #{handler.method(:concat).inspect}" 
else 
    puts "not responding to :concat" 
end 

次に、失敗したテストのいずれかの出力を出力できますか？

更新：出力が実際にテストコンテキストがActionView::TextHelpersモジュールによって汚染されていたと最終的にそれが試験に使用されるモデルに含まActionView::Helpersモジュールがあったことが判明したことを示しました。