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require 'loofah'
module ActionDispatch
module Assertions
module DomAssertions
# \Test two HTML strings for equivalency (e.g., equal even when attributes are in another order)
#
# # assert that the referenced method generates the appropriate HTML string
# assert_dom_equal '<a href="http://www.example.com">Apples</a>', link_to("Apples", "http://www.example.com")
def assert_dom_equal(expected, actual, message = nil)
expected_dom, actual_dom = doms_from_strings(expected, actual)
message ||= "Expected: #{expected_dom}\nActual: #{actual_dom}"
assert compare_doms(expected_dom, actual_dom), message
end
# The negated form of +assert_dom_equal+.
#
# # assert that the referenced method does not generate the specified HTML string
# assert_dom_not_equal '<a href="http://www.example.com">Apples</a>', link_to("Oranges", "http://www.example.com")
def assert_dom_not_equal(expected, actual, message = nil)
expected_dom, actual_dom = doms_from_strings(expected, actual)
message ||= "Expected: #{expected_dom}\nActual: #{actual_dom}"
assert_not compare_doms(expected_dom, actual_dom), message
end
protected
# +doms_from_strings+ creates a Loofah::HTML::DocumentFragment for every string in strings
def doms_from_strings(*strings)
strings.map { |str| Loofah.fragment(str) }
end
# +compare_doms+ takes two doms loops over all their children and compares each child via +equal_children?+
def compare_doms(expected, actual)
expected.children.each_with_index do |child, i|
return false unless equal_children?(child, actual.children[i])
end
true
end
# +equal_children?+ compares children according to their type
# Determines further comparison via said type
# i.e. element node children with equal names has their attributes compared using +attributes_are_equal?+
def equal_children?(child, other_child)
return false unless child.type == other_child.type
case child.type
when Nokogiri::XML::Node::ELEMENT_NODE
child.name == other_child.name && attributes_are_equal?(child, other_child)
else
child.to_s == other_child.to_s
end
end
# +attributes_are_equal?+ sorts elements attributes by name and compares
# each attribute by calling +equal_attribute?+
# If those are +true+ the attributes are considered equal
def attributes_are_equal?(element, other_element)
first_nodes = element.attribute_nodes.sort_by { |a| a.name }
other_nodes = other_element.attribute_nodes.sort_by { |a| a.name }
return false unless first_nodes.size == other_nodes.size
first_nodes.each_with_index do |attr, i|
return false unless equal_attribute?(attr, other_nodes[i])
end
true
end
# +equal_attribute?+ compares attributes by their name and value
def equal_attribute?(attr, other_attr)
attr.name == other_attr.name && attr.value == other_attr.value
end
end
end
end
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