require 'minitest/autorun'
require_relative 'grains'

# Common test data version: 1.0.0 2e0e77e
class GrainsTest < Minitest::Test
  def test_1
    assert_equal 1, Grains.square(1)
  end

  def test_2
    assert_equal 2, Grains.square(2)
  end

  def test_3
    assert_equal 4, Grains.square(3)
  end

  def test_4
    assert_equal 8, Grains.square(4)
  end

  def test_16
    assert_equal 32_768, Grains.square(16)
  end

  def test_32
    assert_equal 2_147_483_648, Grains.square(32)
  end

  def test_64
    assert_equal 9_223_372_036_854_775_808, Grains.square(64)
  end

  def test_square_0_raises_an_exception
    assert_raises(ArgumentError) { Grains.square(0) }
  end

  def test_negative_square_raises_an_exception
    assert_raises(ArgumentError) { Grains.square(-1) }
  end

  def test_square_greater_than_64_raises_an_exception
    assert_raises(ArgumentError) { Grains.square(65) }
  end

  def test_returns_the_total_number_of_grains_on_the_board
    assert_equal 18_446_744_073_709_551_615, Grains.total
  end

  # Problems in exercism evolve over time, as we find better ways to ask
  # questions.
  # The version number refers to the version of the problem you solved,
  # not your solution.
  #
  # Define a constant named VERSION inside of the top level BookKeeping
  # module, which may be placed near the end of your file.
  #
  # In your file, it will look like this:
  #
  # module BookKeeping
  #   VERSION = 1 # Where the version number matches the one in the test.
  # end
  #
  # If you are curious, read more about constants on RubyDoc:
  # http://ruby-doc.org/docs/ruby-doc-bundle/UsersGuide/rg/constants.html

  def test_bookkeeping
    assert_equal 1, BookKeeping::VERSION
  end
end