[Solved] Given the code below, what will be printed when the test runs?let(:count) { 0 } before { count += 1 } it "increments count" do puts count end | Ruby

Ruby - Testing with RSpec and Minitest

Given the code below, what will be printed when the test runs?

let(:count) { 0 }
before { count += 1 }
it "increments count" do
  puts count
end

A0

B1

C2

DError: undefined method += for nil

Step-by-Step Solution

Solution:

Step 1: Understand let and before interaction
let(:count) { 0 } defines a method returning 0. But count is not a variable; it's a method call.
Step 2: Analyze before { count += 1 }
count += 1 tries to modify count as a variable, but count is a method, so Ruby raises an error: undefined method += for nil or no local variable.
Final Answer:
Error: undefined method += for nil -> Option D
Quick Check:
Cannot modify let method return with += [OK]

Quick Trick: let defines methods, not variables; += fails on method calls [OK]

Common Mistakes:

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