CODEWITHSUNDEEP
rubyrspec
PaulWallis42
PaulWallis42

Reputation: 91

RSpec test for a method that contains gets.chomp

How do I design a RSpec test for assigning a gets.chomp method to an instance variable?

def choose
    puts "Please enter the type you want:"
    @type = gets.chomp
    puts "Thank you, now please enter how many of those you want:"
    @quantity = gets.chomp
end

Upvotes: 2

Views: 2126

Answers (1)

Alexander
Alexander

Reputation: 2558

You can use stubs/mocks for that. But the main question is: where did you place def choose? It's important since i'll stub it's calls on some object.

Let imagine you have this method in class Item:

class Item
  def choose
    puts "Please enter the type you want:"
    @type = gets.chomp
    puts "Thank you, now please enter how many of those you want:"
    @quantity = gets.chomp
  end
end

Then i'll be able to stub gets and chomp calls to simulate user's input:

RSpec.describe Item do
  describe '#choose' do
    before do
      io_obj = double
      expect(subject)
        .to receive(:gets)
        .and_return(io_obj)
        .twice
      expect(io_obj)
        .to receive(:chomp)
        .and_return(:type)
      expect(io_obj)
        .to receive(:chomp)
        .and_return(:quantity)
    end

    it 'sets @type and @quantity according to user\'s input' do
      subject.choose

      expect(subject.instance_variable_get(:@type)).to eq :type
      expect(subject.instance_variable_get(:@quantity)).to eq :quantity
    end
  end
end

Upvotes: 2

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