how do I use rspec to test instance methods in ruby?

Question

I have an instance method that would be invoked after creating a new instance of the class.

How do I test it in Rspec? I use the following and get an error:

  let(:schedule) { ScheduleKaya.new('test-client-id') }
  let(:schedule) { schedule.create_recurring_event('test-keyword', 'slack') }

In other words, I want to create the instance. Then I want to apply a method create_recurring_event.

My test wants to check if it assigned the variables to the instance.

it "has @keyword = test-keyword" do

     expect(schedule.keyword).to eq('test-keyword')

end

Because it makes a database call, I want to check the response back from the call to see if I get a status = 200.

But I can't seem to both create the instance and then apply the method.

Question:

What is the right way to test for an instance method, one that is applied after creating a new instance.

spickermann · Accepted Answer · 2015-10-09 06:07:53Z

1

A let block acts like a method and returns the return value of the last statement. Therefore just write both into the same block and ensure that the right value is returned:

let(:schedule) do
  schedule_kaya = ScheduleKaya.new('test-client-id')
  schedule_kaya.create_recurring_event('test-keyword', 'slack')
  schedule_kaya
end

Or you can use tap:

let(:schedule) do
  ScheduleKaya.new('test-client-id').tap do |schedule_kaya|
    schedule_kaya.create_recurring_event('test-keyword', 'slack')
  end
end

answered Oct 9, 2015 at 6:07

spickermann

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2 Comments

Satchel Over a year ago

Ahhh this is what I was looking for.

Satchel Over a year ago

This is the first time I saw someone explain this this clearly after scouring the web on every article on rspec and let.

William Hu · Accepted Answer · 2015-10-09 07:10:55Z

0

I suggest FactoryGirl together with Rspec, if you are on Railsfactory_girl_rails, looks like below:

it "has @keyword = test-keyword" do
  schedule = Factory(:shcedule, keyword: "has @keyword = test-keyword")
  expect(schedule.keyword).to eq('test-keyword')
end

answered Oct 9, 2015 at 7:10

William Hu

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