require 'minitest/autorun'
require_relative 'collatz_conjecture'

# Common test data version: 1.2.1 d94e348
class CollatzConjectureTest < Minitest::Test
  def test_zero_steps_for_one
    # skip
    assert_equal 0, CollatzConjecture.steps(1)
  end

  def test_divide_if_even
    # skip
    assert_equal 4, CollatzConjecture.steps(16)
  end

  def test_even_and_odd_steps
    # skip
    assert_equal 9, CollatzConjecture.steps(12)
  end

  def test_large_number_of_even_and_odd_steps
    # skip
    assert_equal 152, CollatzConjecture.steps(1_000_000)
  end

  def test_zero_is_an_error
    # skip
    assert_raises(ArgumentError) do
      CollatzConjecture.steps(0)
    end
  end

  def test_negative_value_is_an_error
    # skip
    assert_raises(ArgumentError) do
      CollatzConjecture.steps(-15)
    end
  end
end