Ruby rspec error for pushing into an array

Question

Im trying to pass a test for pushing an item into an array from another class. Here is the method.

require_relative 'message'

class Test

  attr_reader :message

  def initialize(message = Message.new)
    @message = message
  end

  def push(hello)
    @message.array << hello
  end
end

The empty array in a different class.

class Message

  attr_reader :array 

  def initialize
    @array = []
  end
end

and my test.

require 'test'

describe Test do

  let(:message) { double(array: [])}

  describe '#push' do
    it 'pushes an item into an array from the message class' do
      subject.push("hello")
      expect(message.array).to eq ["hello"]
    end
  end
end

currenty getting the error

expected: ["hello"]
     got: []

       (compared using ==)

what am i doing wrong? The method itself is simple and works, why does my test not?

BTL · Accepted Answer · 2020-05-14 13:33:26Z

1

The message you defined here : let(:message) { double(array: [])} has nothing to do with the rest.

Since you pushed into subject you have to check on it.

require 'test'

describe Test do
  describe '#push' do
    it 'pushes an item into an array from the message class' do
      subject = Test.new
      subject.push("hello")
      expect(subject.message.array).to eq ["hello"]
    end
  end
end

answered May 14, 2020 at 13:33

BTL

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2 Comments

TheMayerof Over a year ago

ahhhhh can't belive i missed that! thanks so much dude ;)

BTL Over a year ago

You're welcome :) (Don't hesitate to flag it as the good answer if it solved your problem)

ruud · Accepted Answer · 2020-05-14 13:26:52Z

0

In your let, you assign an empty array to message and then test if it contains 'hello'. That fails because message is empty. Did you mean to push 'hello' to the message array instead of to 'subject'?

answered May 14, 2020 at 13:26

ruud

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