shallow_copy.rb

require 'test/unit'

class ShallowTest < Test::Unit::TestCase
  def test_standard_copy_should_be_by_reference_and_changes_should_back_propagate
    simple_array = [1,"hello", 3.000]
    copied_array = simple_array
    copied_array[0] = nil
    copied_array[1] = nil
    copied_array[2] = nil
    
    assert_equal copied_array, simple_array
  end
  
  def test_clone_should_be_by_value_and_changes_should_not_back_propogate
    simple_array = [1,"hello", 3.000]
    copied_array = simple_array.clone
    copied_array[0] = nil
    copied_array[1] = nil
    copied_array[2] = nil
    
    assert_not_equal copied_array, simple_array
  end
end

#  2 tests, 2 assertions, 0 failures, 0 errors