如何模拟Net :: HTTP :: Post？

是的，我知道最好使用webmock，但我想知道如何在RSpec中模拟这个方法：

def method_to_test url = URI.parse uri req = Net::HTTP::Post.new url.path res = Net::HTTP.start(url.host, url.port) do |http| http.request req, foo: 1 end res end 

这是RSpec：

 let( :uri ) { 'http://example.com' } specify 'HTTP call' do http = mock :http Net::HTTP.stub!(:start).and_yield http http.should_receive(:request).with(Net::HTTP::Post.new(uri), foo: 1) .and_return 202 method_to_test.should == 202 end 

测试失败，因为似乎试图匹配NET :: HTTP :: Post对象：

 RSpec::Mocks::MockExpectationError: (Mock :http).request(#, {:foo=>"1"}) expected: 1 time received: 0 times Mock :http received :request with unexpected arguments expected: (#, {:foo=>"1"}) got: (#, {:foo=>"1"}) 

如何正确匹配？

Answer 1

如果您不关心确切的实例，可以使用an_instance_of方法：

 http.should_receive(:request).with(an_instance_of(Net::HTTP::Post), foo: 1) .and_return 202 

Answer 2

这是新语法：

 before do http = double allow(Net::HTTP).to receive(:start).and_yield http allow(http).to \ receive(:request).with(an_instance_of(Net::HTTP::Get)) .and_return(Net::HTTPResponse) end 

然后在例子中：

 it "http" do allow(Net::HTTPResponse).to receive(:body) .and_return('the actual body of response') # here execute request end 

如果您需要测试外部api库，非常有用。