fibonacci.rb

# Write program that prints out the nth number in a fibonnaci sequence

# fib(n): 0, 1, 1, 2, 3, 5, 8, 13, 21, 34
#    (n): 0, 1, 2, 3, 4, 5, 6, 7,  8, 9

require 'pry'
require 'minitest/autorun'
require 'minitest/pride'

def fib(n)
  return 0 if n == 0
  return 1 if n == 1

  fib(n - 1) + fib(n - 2)
end


class FibTest < MiniTest::Unit::TestCase

  def test_n_is_0
    assert_equal 0, fib(0)
  end

  def test_n_is_1
    assert_equal 1, fib(1)
  end

  def test_n_is_2
    assert_equal 1, fib(2)
  end

  def test_n_is_5
    assert_equal 5, fib(5)
  end

  def test_n_is_6
    assert_equal 8, fib(6)
  end

  def test_n_is_34
    assert_equal 34, fib(9)
  end
end