[Solved] Identify the error in this test double usage and how to fix it:order = double('order') allow(order).to receive(:total) puts order.total | Ruby

Ruby - Testing with RSpec and Minitest

Identify the error in this test double usage and how to fix it:

order = double('order')
allow(order).to receive(:total)
puts order.total

AMissing <code>and_return</code> causes <code>order.total</code> to return nil, fix by adding <code>and_return</code>

BDouble name should be a symbol, fix by using <code>double(:order)</code>

CCannot call <code>allow</code> on a double, fix by using <code>expect</code>

DMissing <code>puts</code> before <code>order.total</code>

Step-by-Step Solution

Solution:

Step 1: Analyze the stub setup
The method total is allowed but no return value is set, so it returns nil.
Step 2: Fix by adding return value
Add and_return(value) to specify what total should return.
Final Answer:
Missing and_return causes order.total to return nil, fix by adding and_return -> Option A
Quick Check:
Stub needs return value = B [OK]

Quick Trick: Always add and_return to stub methods for expected output [OK]

Common Mistakes:

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