adder0-test.rb

def assert_equality(example, actual, expected)
  print "example #{example}: "
  if actual == expected
    puts 'Pass'
  else
    puts "Fail: got #{actual.inspect}; expected #{expected.inspect}"
  end
end

examples = [
  [0, 0, 0, 0],
  [1, 0, 0, 1],
  [0, 1, 0, 1],
  [1, 1, 1, 0]
]

examples.each do |example|
  a, b, c, s = example
  half_adder = HalfAdder.new(a, b)                   # setup
  half_adder.compute                                 # exercise
  assert_equality(example, half_adder.carry, c)      # verify
  assert_equality(example, half_adder.sum, s)        # verify
  adder = nil                                        # teardown
end