# 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