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Contents
require 'spec_helper'
module XML
module MappingExtensions
class LatexRationalNode < NodeBase
def to_value(xml_text)
match_data = /\\frac\{([0-9.]+)\}\{([0-9.]+)\}/.match(xml_text)
Rational("#{match_data[1]}/#{match_data[2]}")
end
def to_xml_text(value)
"\\frac{#{value.numerator}}{#{value.denominator}}"
end
end
::XML::Mapping.add_node_class LatexRationalNode
class SomeElem
include ::XML::Mapping
latex_rational_node :rational, '@rational'
end
describe NodeBase do
describe '#extract_attr_value' do
it 'forwards to #to_value' do
xml = REXML::Document.new('<some_elem rational="\frac{1}{2}"/>').root
mapping = SomeElem.load_from_xml(xml)
expect(mapping.rational).to eq(Rational('1/2'))
end
it 'produces useful error messages' do
xml = REXML::Document.new('<some_elem rational="elvis"/>').root
expect { SomeElem.load_from_xml(xml) }.to raise_error do |e|
expect(e.message).to match(/SomeElem.rational.*'elvis'/)
end
end
end
describe '#set_attr_value' do
it 'forwards to #to_xml_text' do
node = LatexRationalNode.new(SomeElem, :rational, 'rational')
expect(node.to_xml_text(Rational('1/2'))).to eq('\frac{1}{2}')
end
end
describe '#xml_text' do
it 'should be abstract' do
node = NodeBase.allocate
expect { node.to_value('some text') }.to raise_error do |e|
expect(e).to be_a(NoMethodError)
expect(e.message).to include('should override #to_value')
end
end
end
describe '#to_xml_text' do
it 'should call to_s by default' do
node = NodeBase.allocate
values = ['elvis', 123, Object.new]
values.each do |v|
expect(node.to_xml_text(v)).to eq(v.to_s)
end
end
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems