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Story 1.1: Calculator Basic Operations

Story Metadata

story:
  epic: '1'
  number: '1'
  title: 'Calculator Basic Operations'
  status: 'ready'
  priority: 'high'

# TDD Configuration (only when tdd.enabled=true)
tdd:
  status: 'done' # red|green|refactor|done
  cycle: 1
  coverage_target: 90.0
  tests:
    - id: 'CB-001'
      name: 'Addition operations'
      type: unit
      status: passing
      file_path: 'tests/calculator.test.js'
    - id: 'CB-002'
      name: 'Subtraction operations'
      type: unit
      status: passing
      file_path: 'tests/calculator.test.js'
    - id: 'CB-003'
      name: 'Multiplication operations'
      type: unit
      status: passing
      file_path: 'tests/calculator.test.js'
    - id: 'CB-004'
      name: 'Division operations'
      type: unit
      status: passing
      file_path: 'tests/calculator.test.js'
    - id: 'CB-005'
      name: 'Division by zero error handling'
      type: unit
      status: passing
      file_path: 'tests/calculator.test.js'
    - id: 'CB-006'
      name: 'Invalid input handling'
      type: unit
      status: passing
      file_path: 'tests/calculator.test.js'
    - id: 'CB-008'
      name: 'Performance requirements'
      type: unit
      status: passing
      file_path: 'tests/calculator.test.js'

Story Description

As a user of the calculator application
I want to perform basic mathematical operations (add, subtract, multiply, divide)
So that I can solve simple mathematical problems efficiently

Context

This is the foundational feature for our calculator application. It needs to handle the four basic mathematical operations with proper error handling for edge cases like division by zero. This will serve as the core functionality that other advanced features will build upon.

Acceptance Criteria

Feature: Calculator Basic Operations

Scenario: Addition of two positive numbers
  Given I have a calculator
  When I add 5 and 3
  Then the result should be 8

Scenario: Subtraction operation
  Given I have a calculator
  When I subtract 3 from 10
  Then the result should be 7

Scenario: Multiplication operation
  Given I have a calculator
  When I multiply 4 by 6
  Then the result should be 24

Scenario: Division operation
  Given I have a calculator
  When I divide 15 by 3
  Then the result should be 5

Scenario: Division by zero error handling
  Given I have a calculator
  When I divide 10 by 0
  Then it should throw an error with message "Cannot divide by zero"

Scenario: Invalid input handling
  Given I have a calculator
  When I provide non-numeric input
  Then it should throw an error with message "Invalid input: numbers required"

Technical Requirements

Functional Requirements

Support addition, subtraction, multiplication, and division operations
Handle positive and negative numbers
Handle decimal numbers with proper precision
Throw descriptive errors for invalid operations
Return numeric results for valid operations

Non-Functional Requirements

Performance: Each operation should complete in < 1ms
Security: Validate all inputs to prevent injection attacks
Reliability: Handle edge cases gracefully with clear error messages
Maintainability: Clean, well-documented code following JavaScript best practices

TDD Test Plan (QA Agent Responsibility)

Test Strategy

Primary Test Type: unit
Mocking Approach: No external dependencies to mock (pure functions)
Test Data: Fixed test cases covering all operations and edge cases

Planned Test Scenarios

ID	Scenario	Type	Priority	AC Reference
CB-001	Addition operations	unit	P0	AC1
CB-002	Subtraction operations	unit	P0	AC2
CB-003	Multiplication operations	unit	P0	AC3
CB-004	Division operations	unit	P0	AC4
CB-005	Division by zero handling	unit	P0	AC5
CB-006	Invalid input handling	unit	P0	AC6
CB-007	Decimal precision tests	unit	P1	NFR
CB-008	Performance requirements	unit	P2	NFR

TDD Progress

Current Phase: REFACTOR COMPLETED ✅ - TDD CYCLE DONE ✓

Cycle: 1 Last Updated: 2025-01-01

Red Phase - Cycle 1

Date: 2025-01-01 Agent: QA Agent (TDD Implementation)

Tests Written:

CB-001: Addition operations (FAILING ✅)
CB-002: Subtraction operations (FAILING ✅)
CB-003: Multiplication operations (FAILING ✅)
CB-004: Division operations (FAILING ✅)
CB-005: Division by zero error handling (FAILING ✅)
CB-006: Invalid input handling (FAILING ✅)
CB-008: Performance requirements (FAILING ✅)

Test Files:

tests/calculator.test.js (21 test cases)

Test Execution Status:

❌ Calculator class not found - Cannot find module '../src/calculator'
✅ Tests fail for correct reason (no implementation exists)
✅ Ready for Green phase implementation

Green Phase - Cycle 1

Date: 2025-01-01 Agent: Dev Agent (TDD Implementation)

Implementation Completed:

✅ Calculator class with input validation
✅ Addition method with error handling
✅ Subtraction method with error handling
✅ Multiplication method with error handling
✅ Division method with zero-check validation
✅ Comprehensive input validation helper method

Test Results:

✅ All 21 tests passing
✅ 100% code coverage achieved (exceeds 90% target)
✅ Performance requirements met (< 1ms per operation)
✅ All acceptance criteria satisfied

Files Created:

src/calculator.js (72 lines, fully tested)

Refactor Phase - Cycle 1

Date: 2025-01-01 Agents: Dev Agent & QA Agent (Collaborative TDD Refactoring)

Refactoring Completed:

✅ Extracted error message constants for consistency
✅ Simplified complex validation condition into _isValidNumber() helper
✅ Extracted division-by-zero validation into _validateNotZeroDivisor()
✅ Improved code readability and maintainability
✅ Enhanced function naming and separation of concerns

Code Quality Improvements:

Complex boolean condition replaced with readable helper method
Error messages centralized as class constants
Validation logic separated into focused, single-purpose methods
Code organization improved with better separation of concerns
Test coverage maintained at 100%

Files Modified:

src/calculator.js (refactored from 87 to 92 lines with better structure)

All Tests Passing: ✅

TDD Cycle Complete: All Red-Green-Refactor phases completed successfully

Implementation Tasks (Dev Agent)

Primary Tasks

Create Calculator class with basic structure
Implement addition method with validation
Implement subtraction method with validation
Implement multiplication method with validation
Implement division method with zero-check validation
Add comprehensive input validation

Subtasks

Set up class constructor
Create private validation helper methods
Implement number type checking
Add error handling with descriptive messages
Ensure decimal precision handling
Add performance optimizations

Definition of Done

TDD-Specific DoD

Tests written first (Red phase completed)
All tests passing (Green phase completed)
Code refactored for quality (Refactor phase completed)
Test coverage meets target (90%)
All external dependencies properly mocked (N/A - no external deps)
No features implemented without corresponding tests

General DoD

All acceptance criteria met
Code follows project standards
Documentation updated
Ready for review

Dev Agent Record

Implementation Notes

(Dev agent will document implementation decisions here)

TDD Cycle Log

(Automatic tracking of Red-Green-Refactor progression)

Cycle 1:

Red Phase: Pending - Tests to be written
Green Phase: Pending - Implementation
Refactor Phase: Pending

File List

(Dev agent will list all files created/modified)

tests/calculator.test.js (to be created in RED phase)
src/calculator.js (to be created in GREEN phase)

Test Execution Log

# Test runs will be logged here during development

QA Results

(QA agent will populate this during review)

Change Log

2025-01-01: Story created from TDD template
2025-01-01: Ready for TDD Red phase initiation

TDD Status: 🔴 RED Phase Ready
Agent Assigned: QA Agent (for test writing)
Estimated Effort: 3 hours

8.7 KiB Raw Blame History