[Solved] Find the error in this RSpec stub code: class Product def price 50 end end product = Product.new allow(product).to receive(:cost).and_return(100) puts product.cost | Ruby

Ruby - Testing with RSpec and Minitest

Find the error in this RSpec stub code:

class Product
  def price
    50
  end
end

product = Product.new
allow(product).to receive(:cost).and_return(100)
puts product.cost

ASyntax error in allow statement

BMethod :cost does not exist on Product

CCannot stub instance methods

DMissing parentheses in method call

Step-by-Step Solution

Solution:

Step 1: Check method existence
Product class defines price but not cost method.
Step 2: Understand stubbing non-existent methods
RSpec allows stubbing methods even if they don't exist, but this can cause confusion or errors in strict mode.
Final Answer:
Method :cost does not exist on Product -> Option B
Quick Check:
Stubbed method must exist or be handled carefully [OK]

Quick Trick: Stub only existing methods or use doubles [OK]

Common Mistakes:

Master "Testing with RSpec and Minitest" in Ruby

9 interactive learning modes - each teaches the same concept differently

More Ruby Quizzes

Find the error in this RSpec stub code: