如何使用 RSpec 测试带有参数的方法？

Question

我有以下 RSpec:

describe Job do
  let(:job) { Job.new }

  describe 'run_job' do
    context 'success' do
        my_param = [{"job1" => "run"}, {"job2" => "run again"}]

        it 'should pass' do
            test_result = job.run_job(my_param)
            expect(test_result[0]["job1"]).to eq("run")
        end
     end
  end
end

方法：

Class Job
  def run_job(my_param)
    # puts "#{my_param}"
    my_param.each do|f|
      # do something
    end
  end
end

当我运行测试时，我收到以下错误

 NoMethodError:
   undefined method `each' for nil:NilClass

我在控制台中打印出 my_param 并看到传递给测试的同一对象 [{"job1" => "run"}, {"job2" => "run again"}]。我不知道为什么 my_param 在调用 .each 时是 nil。我做错了什么？任何见解表示赞赏。

Answer 1

一种方法是在 before 块中定义并将其形成实例变量；

before { @my_param = [{"job1" => "run"}, {"job2" => "run again"}] }

或

但最好的方法是使用 let:

describe Job do
  let(:job) { Job.new }
  let(:my_param) { [{"job1" => "run"}, {"job2" => "run again"}] }
  describe 'run_job' do
    context 'success' do

      it 'should pass' do
        test_result = job.run_job(my_param)
        expect(test_result[0]["job1"]).to eq("run")
      end
    end
  end
end

Answer 2

my_param 应该在 it 块内定义，或者您应该使用 let 来定义 my_param

里面块

describe Job do
  let(:job) { Job.new }

  describe 'run_job' do
    context 'success' do        
        it 'should pass' do
            my_param = [{"job1" => "run"}, {"job2" => "run again"}]

            test_result = job.run_job(my_param)
            expect(test_result[0]["job1"]).to eq("run")
        end
     end
  end
end

使用 let

describe Job do
  let(:job) { Job.new }

  describe 'run_job' do
    context 'success' do
        let(:my_param) { [{"job1" => "run"}, {"job2" => "run again"}] }


        it 'should pass' do
            test_result = job.run_job(my_param)
            expect(test_result[0]["job1"]).to eq("run")
        end
     end
  end
end

块前使用

describe Job do
  let(:job) { Job.new }

  describe 'run_job' do
    context 'success' do
        before(:all) do
          @my_param = [{"job1" => "run"}, {"job2" => "run again"}]
        end

        it 'should pass' do
            test_result = job.run_job(@my_param)
            expect(test_result[0]["job1"]).to eq("run")
        end
     end
  end
end

Answer 3

Better Specs推荐使用let赋值变量：

describe Job do
  let(:job) { Job.new }

  describe 'run_job' do
    context 'success' do
      let(:my_param) { [{"job1" => "run"}, {"job2" => "run again"}] }

      it 'should pass' do
        test_result = job.run_job(my_param)
        expect(test_result[0]["job1"]).to eq("run")
      end
    end
  end
end

如何使用 RSpec 测试带有参数的方法？

How to test a method with a parameter using RSpec?

ruby

rspec3