Rails 中断言参数的方括号

Question

我有这个测试：

def test_should_only_list_promoted_on_index
    get :index
    assert_equal stories(:promoted), assigns(:stories)
  end

失败并显示消息：

<#<Story id: 3, name: "What is a Debugger?", link: "http://en.wikipedia.org/wiki/Debugger", created_at: "2011-03-25 20:57:04", updated_at: "2011-03-25 20:57:04", user_id: 2, votes_count: 5, description: nil>> expected but was
<[#<Story id: 3, name: "What is a Debugger?", link: "http://en.wikipedia.org/wiki/Debugger", created_at: "2011-03-25 20:57:04", updated_at: "2011-03-25 20:57:04", user_id: 2, votes_count: 5, description: nil>]>.

但是，如果我在“stories(:promoted)”参数周围加上方括号，则

def test_should_only_list_promoted_on_index
    get :index
    assert_equal [stories(:promoted)], assigns(:stories)
  end

测试会成功。这是为什么呢？

我正在使用 Rails 2.3.9 和 Ruby 1.9.2

Answer 1

方括号表示一个数组。看起来 stories(:promoted) 仅返回一个故事，而 assigns(:stories) 返回一个包含该故事的 length-1 数组。