RSpec&Rails:辅助规范的Stub request.path

Question

我有这个方法ApplicationHelper:

def home_link_class
  classes = ['navbar-brand']
  classes << 'active' if request.path == root_path
  classes
end

我想像这样测试它:

describe '#home_link_class' do
  before  { allow(helper.request).to receive(:path).and_return '/some-path' }
  subject { home_link_class }

  it { should eq ['navbar-brand'] }
end

遗憾的是,存根似乎不起作用,request帮助器本身的对象被设置为nil,即使在规范中它似乎是一个ActionController::TestRequest对象.

如何确保request规格中提供？

Answer 1

您需要存根请求本身以及路径的返回值.为存根请求定义测试双精度path:

describe '#home_link_class' do
  let(:request) { double('request', path: '/some-path') }

  before  { allow(helper).to receive(:request).and_return(request) }
  subject { home_link_class }

  it { should eq ['navbar-brand'] }
end