Minitest class method mock sample

minitest_class_method_mock_sample.rb

require 'minitest/autorun'

class VoiceServiceTest < Minitest::Test
  def test_calls_remote_service
    remote_service_mock = Minitest::Mock.new
    remote_service_mock.expect(:call, { result: 'ochenta y ocho'}.to_json, ['88.wav'])

    result = nil
    RemoteService.stub(:request_recognize, remote_service_mock) do
      result = VoiceService.recognize('88.wav')
    end

    assert_equal 'ochenta y ocho', result
    remote_service_mock.verify
  end
end


require 'json'

class VoiceService
  def self.recognize(filename)
    response = RemoteService.request_recognize(filename)
    JSON.parse(response)['result']
  end
end

class RemoteService
  def self.request_recognize(resource)
    {result: :whatever}.to_json
  end
end