require 'prime'
def is_prime_check(n)
  n.prime?
end

describe "Basic Tests" do
  it "Low values of n" do
    Test.assert_equals(is_prime(1), false)
    Test.assert_equals(is_prime(2), true)
    Test.assert_equals(is_prime(3), true)
    Test.assert_equals(is_prime(5), true)
    Test.assert_equals(is_prime(7), true)
    Test.assert_equals(is_prime(11), true)
    Test.assert_equals(is_prime(13), true)
    Test.assert_equals(is_prime(15), false)
    Test.assert_equals(is_prime(18), false)
    Test.assert_equals(is_prime(21), false)
  end
end

describe "Random Tests" do
  it "Values of n between 1000 and 10e12" do 
    100.times do
      n = rand(1000..1000000000000)
      puts "Testing for n = #{n}"
      Test.assert_equals(is_prime(n), is_prime_check(n))
    end
  end
end