fac_test.rb

require "test/unit"
require "fatorial.rb"

class TestLibraryFileName < Test::Unit::TestCase
  def test_simples_cases
    assert_equal(120, fatorial(5))
    assert_equal(6, fatorial(3))
  end
  
  def test_negative_numbers
    assert_raise(ArgumentError) {fatorial(-1)}
  end
  
  def test_invalid_argument_type
    assert_raise(TypeError) {fatorial("a")}
  end

end