primes_spec.rb

require 'rspec'
require './lib/primes.rb'

describe isPrime? do
  describe 'one is neither prime nor composite' do
    it 'should return nil if 1 is passed' do
      expect(isPrime?(1)).to eq(nil)
    end
  end
  
  describe 'some prime numbers' do
    it 'should return true for prime numbers' do
      expect(isPrime?(2)).to eq(true)
      expect(isPrime?(3)).to eq(true)
      expect(isPrime?(5)).to eq(true)
      expect(isPrime?(11)).to eq(true)
      expect(isPrime?(8111)).to eq(true)
    end
  end
  
  describe 'some composite numbers' do
    it 'should return false for composite numbers' do
      expect(isPrime?(4)).to eq(false)
      expect(isPrime?(9)).to eq(false)
      expect(isPrime?(12)).to eq(false)
      expect(isPrime?(10000)).to eq(false)
      expect(isPrime?(8374968)).to eq(false)
    end
  end
end