rspec 视图规范的默认主题是什么?

Question

给定 Rails 的 rspec 视图规范，

RSpec.describe "plots/show", type: :view do
describe "displaying inoculation" do
context "inoculated" do
it "displays 'Yes'" do
assign(:plot, build(:plot))
render
expect(rendered).to have_content("Inoculated? Yes")
end
end
end
end

当我尝试将隐式主题样式与it {}一起使用时，

context "inoculated" do
before do
assign(:plot, build(:plot))
render
end
it { is_expected.to have_content("Inoculated? Yes") }
end

测试失败，预期找到文本"已接种？是"中的"接种"。

我期望隐式主语是视图，但相反，主语是传递给context的字符串。为什么视图规范没有视图作为规范的隐式主体？

Answer 1

它与查看规范无关。确定默认主题时，它会尝试在嵌套描述链中查找类引用。如果找到，则采用最里面的类。如果未找到，则采用最里面的值(大概是一个字符串(。

RSpec.describe User do
describe 'foo' do
describe 'bar' do
it { puts subject }
it { puts subject.class }
end
end
end
RSpec.describe 'User' do
describe 'foo' do
describe 'bar' do
it { puts subject }
it { puts subject.class }
end
end
end
RSpec.describe 'User' do
describe Project do
describe 'bar' do
it { puts subject }
it { puts subject.class }
end
end
end

输出

#<User:0x007fe77593af80>
User
bar
String
#<Project:0x007fe7924f9170>
Project

这一切都从这里开始，顺便说一句(如果你也倾向于做一些挖掘(：

From: /Users/sergio/.gem/ruby/2.4.1/gems/rspec-core-3.6.0/lib/rspec/core/memoized_helpers.rb @ line 57:
Owner: RSpec::Core::MemoizedHelpers
Visibility: public
Number of lines: 6
def subject
__memoized.fetch_or_store(:subject) do
described = described_class || self.class.metadata.fetch(:description_args).first
Class === described ? described.new : described
end
end