[Solved] What will be the output of the following code?let(:number) { rand(10) } before { @num = number } it 'checks number' do expect(@num).to eq(number) end | Ruby

Ruby - Testing with RSpec and Minitest

What will be the output of the following code?

let(:number) { rand(10) }
before { @num = number }
it 'checks number' do
  expect(@num).to eq(number)
end

ATest fails because @num is nil

BTest passes because @num equals number

CTest fails because number changes between calls

DTest passes because rand(10) returns fixed value

Step-by-Step Solution

Solution:

Step 1: Understand let memoization
let(:number) calls rand(10) once per example and memoizes the value.
Step 2: Analyze before hook
@num is assigned the memoized number value.
Step 3: Check expectation
Both @num and number refer to the same memoized value, so test passes.
Final Answer:
Test passes because @num equals number -> Option B
Quick Check:
let memoizes value per example [OK]

Quick Trick: let value stays same within one test example [OK]

Common Mistakes:

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