Testing

Testing in Ruby is commonly done using a testing framework called RSpec. RSpec is a behavior-driven development (BDD) framework that allows you to write expressive and readable tests for your Ruby code.

Install RSpec

Add rspec gem into your project's Gemfile and run:

bundle install

If you don't have a Gemfile, you can install it globally by running:

gem install rspec

Create a Spec File

In your project directory, create a spec directory if it doesn't already exist. Inside the spec directory, create a file with a _spec.rb extension. For example, if you have a calculator.rb file, you can create a calculator_spec.rb file in the spec directory.

Write the Tests

In your spec file, require the necessary files and start writing tests. RSpec uses a specific syntax that is designed to read like English sentences.

# spec/calculator_spec.rb

require_relative '../calculator'
describe Calculator do
  describe '#add' do
    it 'adds two numbers' do
      calculator = Calculator.new
      result = calculator.add(2, 3)
      expect(result).to eq(5)
    end
  end
end

RSpec provides various matchers for making assertions in your tests. In the example above, expect(result).to eq(5) is using the eq matcher to check if the result is equal to 5. There are many other matchers like be, include, match, etc.

Run the Tests

Run the following command to execute your tests:

rspec

RSpec will discover and run all the spec files in your spec directory and report the results.

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