[Solved] What is wrong with this TDD workflow snippet in Ruby? class TestCalculator < Minitest::Test def test_multiply calc = Calculator.... What is wrong with this TDD workflow snippet in Ruby? | Ruby

Ruby - Testing with RSpec and Minitest

What is wrong with this TDD workflow snippet in Ruby?

class TestCalculator < Minitest::Test
  def test_multiply
    calc = Calculator.new
    assert_equal 6, calc.multiply(2, 3)
  end
end

class Calculator
  def multiply(a, b)
    a - b
  end
end

AThe test method name is incorrect

Bassert_equal arguments are reversed

CCalculator class is missing

DThe multiply method subtracts instead of multiplies

Step-by-Step Solution

Solution:

Step 1: Compare method implementation with test expectation
The test expects multiply(2, 3) to return 6, but the method subtracts a - b.
Step 2: Identify the error cause
Subtracting 2 - 3 gives -1, which will fail the test expecting 6.
Final Answer:
The multiply method subtracts instead of multiplies -> Option D
Quick Check:
Method logic must match test expectation [OK]

Quick Trick: Check method logic matches test assertions [OK]

Common Mistakes:

Confusing subtraction with multiplication
Ignoring method implementation details
Assuming test method name affects test result

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What is wrong with this TDD workflow snippet in Ruby?

Step 1: Compare method implementation with test expectation

Step 2: Identify the error cause

Final Answer:

Quick Check:

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