# File test/core_test.rb, line 452
 def test_child
		sean = Element.new "Sean"
		rubbell = Element.new "Rubbell"
		elliott = sean.add_element "Elliott"
		sean << rubbell
		assert_equals elliott, rubbell.previous_sibling
		assert_equals rubbell, elliott.next_sibling

		russell = Element.new "Russell"
		rubbell.replace_with russell
		assert_equals elliott, russell.previous_sibling
		assert_equals russell, elliott.next_sibling

		assert_nil russell.document
		assert_equal sean, russell.root
	end