Ruby RSpec #

RSpec.describe Calculator do
  describe '#add' do
    it 'returns the sum of two numbers' do
      calc = Calculator.new
      expect(calc.add(2, 3)).to eq(5)
    end
  end
end

expect(value).to eq(expected)
expect(value).to be_true
expect(value).to be_false
expect(value).to be_nil
expect(array).to include(item)
expect(string).to match(/pattern/)
expect { code }.to raise_error(ErrorClass)
expect { code }.to change { counter }.by(1)

RSpec.describe User do
  subject { User.new(name) }
  let(:name) { "Ruby" }

  before do
    setup_code
  end

  after do
    cleanup_code
  end

  describe '#greet' do
    it 'returns a greeting' do
      expect(subject.greet).to eq("Hello, Ruby")
    end
  end
end

rspec
rspec spec/user_spec.rb
rspec --format documentation