How can you verify that a test double cart received the method add_item with argument 'apple' exactly once?

hard📝 Application Q9 of 15

Ruby - Testing with RSpec and Minitest

How can you verify that a test double cart received the method add_item with argument 'apple' exactly once?

Aexpect(cart).to have_received(:add_item).with('apple').once

Ballow(cart).to receive(:add_item).with('apple').once

Ccart.should_receive(:add_item).with('apple').once

Dexpect(cart).to receive(:add_item).with('apple').once

Step-by-Step Solution

Solution:

Step 1: Understand verification vs stubbing
expect(...).to receive sets expectation before the method call.
Step 2: Identify correct syntax for verifying call
expect(cart).to receive(:add_item).with('apple').once correctly sets expectation with receive and once. expect(cart).to have_received(:add_item).with('apple').once checks after call but requires have_received only after call. allow(cart).to receive(:add_item).with('apple').once uses allow which stubs but does not verify. cart.should_receive(:add_item).with('apple').once uses old syntax.
Final Answer:
expect(cart).to receive(:add_item).with('apple').once -> Option D
Quick Check:
Use expect(...).to receive(...) to verify calls [OK]

Quick Trick: Use expect(...).to receive(...) to verify method calls [OK]

Common Mistakes:

Master "Testing with RSpec and Minitest" in Ruby

9 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Ruby Quizzes