我正在尝试使用MiniTest / Mocks模拟以下代码。但是运行测试时,我一直收到此错误。
Minitest::Assertion: unexpected invocation: #<Mock:0x7fa76b53d5d0>.size()
unsatisfied expectations:
- expected exactly once, not yet invoked: #<Mock:0x7fa76b53d5d0>.getresources("_F5DC2A7B3840CF8DD20E021B6C4E5FE0.corwin.co", Resolv::DNS::Resource::IN::CNAME)
satisfied expectations:
- expected exactly once, invoked once: Resolv::DNS.open(any_parameters)
正在测试的代码
txt = Resolv::DNS.open do |dns|
records = dns.getresources(options[:cname_origin], Resolv::DNS::Resource::IN::CNAME)
end
binding.pry
return (txt.size > 0) ? (options[:cname_destination].downcase == txt.last.name.to_s.downcase) : false
我的测试
::Resolv::DNS.expects(:open).returns(dns = mock)
dns.expects(:getresources)
.with(subject.cname_origin(true), Resolv::DNS::Resource::IN::CNAME)
.returns([Resolv::DNS::Resource::IN::CNAME.new(subject.cname_destination)])
.once
现在,您正在测试Resolv::DNS
收到open
返回了您的mock
,但由于您似乎正在尝试测试dns
模拟是否正在接收消息,因此您需要对方法进行存根并将其提供给要产生的对象
改为尝试:
dns = mock
dns.expects(:getresources)
.with(subject.cname_origin(true), Resolv::DNS::Resource::IN::CNAME)
.returns([Resolv::DNS::Resource::IN::CNAME.new(subject.cname_destination)])
.once
::Resolv::DNS.stub :open, true, dns do
# whatever code actually calls the "code being tested"
end
dns.verify
存根的第二个参数是存根的返回值,stub
的第三个参数是将要产生到块的内容,而不是原始产生的值。
在RSpec中,语法更简单(也更具语义),例如:
dns = double
allow(::Resolv::DNS).to receive(:open).and_yield(dns)
expect(:dns).to receive(:getresources).once
.with(subject.cname_origin(true), Resolv::DNS::Resource::IN::CNAME)
.and_return([Resolv::DNS::Resource::IN::CNAME.new(subject.cname_destination)])
# whatever code actually calls the "code being tested"