[Solved] Identify the error in this Ruby test double code:product = double('product') allow(product).to receive(:price).and_return(100) puts product.cost | Ruby

Ruby - Testing with RSpec and Minitest

Identify the error in this Ruby test double code:

product = double('product')
allow(product).to receive(:price).and_return(100)
puts product.cost

ACalling an unstubbed method <code>cost</code> causes an error

BThe double name should be a symbol, not a string

CThe <code>allow</code> method is used incorrectly

DThe <code>and_return</code> value must be a string

Step-by-Step Solution

Solution:

Step 1: Check stubbed methods
Only price is stubbed to return 100.
Step 2: Identify method called
The code calls product.cost, which is not stubbed, causing an error.
Final Answer:
Calling an unstubbed method cost causes an error -> Option A
Quick Check:
Unstubbed method call = error [OK]

Quick Trick: Stub all methods you call on doubles to avoid errors [OK]

Common Mistakes:

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