String Calculator

Overview

The String Calculator is a Ruby utility that performs addition on a string of numbers. This project demonstrates the principles of Test-Driven Development (TDD) by implementing and refining the calculator through various test cases.

Features

Empty String Handling

Input: ""
Output: 0
Description: Returns 0 for an empty string.

Single Number

Input: "1"
Output: 1
Description: Returns the single number itself.

Two Numbers

Input: "1,5"
Output: 6
Description: Returns the sum of the two numbers.

Handling New Lines

Input: "1\n2,3"
Output: 6
Description: Handles new lines as well as commas for separating numbers.

Custom Delimiters

Input: "//;\n1;2"
Output: 3
Description: Allows custom delimiters specified at the beginning of the string.

Negative Numbers

Input: "1,-2"
Output: Throws an exception: negative numbers not allowed -2
Description: Throws an exception if negative numbers are present, listing all negatives.

Ignoring Large Numbers

Input: "2,1001"
Output: 2
Description: Ignores numbers greater than 1000.

Get Call Count

Method: get_called_count
Description: Returns the number of times the add method was invoked.

Installation

1. Ensure Ruby is Installed:

You need Ruby installed on your system to run the String Calculator. You can check if Ruby is installed by running:

ruby -v

If Ruby is not installed, you can download and install it from https://www.ruby-lang.org/.

2. Clone the repository:

git clone https://github.com/rahulsingh321/string-calculator.git

3. Navigate into the project directory:

cd string-calculator

Usage

1. Run the Tests:

ruby string_calculator_test.rb