Rubyonrails rspec 共享示例与共享上下文

分享的例子和共享上下文之间的真正区别是什么？

我的观察:

1. 我可以用这两种方法测试相同的东西(即分享的例子或共享上下文)

2. 但如果我使用后面的测试，我的其他一些测试就会失败.

Observation #1 :

我比较了https://www.relishapp.com/份文档中的分享的例子份和共享上下文份

句法上的差异是:

• 共享上下文 to define a block that will be evaluated in the context of example groups by implicitly matching metadata

例子:

共享上下文 "shared stuff", :a => :b do
  ...
end

• 从测试文件中包含或调用它们的方式

分享的例子

include_examples "name"      # include the examples in the current context
it_behaves_like "name"       # include the examples in a nested context
it_should_behave_like "name" # include the examples in a nested context

共享上下文

include_context "shared stuff"

Observation #2

我有一个测试用例

共享上下文 'limit_articles' do |factory_name|
  before do
    @account = create(:account)
  end

  it 'should restrict 3rd article' do
    create_list(factory_name, 3, account: @account)

    article4 = build(factory_name, account: @account)
    article4.should be_invalid
  end

  it 'should allow 1st article' do
    ...
  end

  it 'should allow 2nd article' do
    ...
  end
end

And include the context in a spec file which already has one 共享上下文 included, then the existing one fails. But I change the order then all my test passes

Fails

include_context 'existing_共享上下文'

include_context 'limit_articles'

Also if I replace the 共享上下文 with 分享的例子 and accordingly include it in test case.

Passes

include_context 'existing_共享上下文'

it_behaves_like 'limit_articles'