访问RSpec中的父范围主题？

Question

如何在RSpec中定义当前范围的主题（改进主题）时访问父范围的主题？

示例代码：

describe MyModule.method(:some_method) do 

    context "when called with a String" do 
    let(:string) { "Hey there!" } 

    # I want to refine the subject using the parent scope's subject - common case 
    # is applying a subject method. Something like: 
    subject { super.subject.call string } 

    # Use subject... 

    end # when called with a String 

end # MyModule.some_method 

Answer 1

OK，信贷从上述评论@mudasobwa，这里的解决方案：

你需要调用super()与明确没有参数 - super不会单独工作，因为它试图使用Ruby的隐式传递参数并失败。

更正例如：

describe MyModule.method(:some_method) do 

    context "when called with a String" do 
    let(:string) { "Hey there!" } 

    # Note the explicit `()`: 
    subject { super().call string } 

    # Use subject... 

    end # when called with a String 

end # MyModule.some_method 

Answer 2

你能说出你的主题：

context do 
    subject(:my_thing) { described_class.new } 

    context '#do_stuff' 
    subject { my_thing.do_stuff } 

    it { expect(subject).to ... } # or 
    it { is_expected.to ... } 
    end 
end