def test_predicate_attr_equality(self):
xml = XML('<root><item/><item important="notso"/></root>')
path = Path('item[@important="very"]')
self.assertEqual('', path.select(xml).render())
path = Path('item[@important!="very"]')
self.assertEqual('<item/><item important="notso"/>',
path.select(xml).render())
def test_predicate_attr_equality(self):
xml = XML('<root><item/><item important="notso"/></root>')
path = Path('item[@important="very"]')
self.assertEqual('', path.select(xml).render())
path = Path('item[@important!="very"]')
self.assertEqual('<item/><item important="notso"/>',
path.select(xml).render())
def test_predicate_number_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[number("3.0")=3]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[number("3.0")=3.0]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[number("0.1")=.1]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_number_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[number("3.0")=3]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[number("3.0")=3.0]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[number("0.1")=.1]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_1step_self(self):
xml = XML('<root><elem/></root>')
path = Path('.')
self.assertEqual('<Path "self::node()">', repr(path))
self.assertEqual('<root><elem/></root>', path.select(xml).render())
path = Path('self::node()')
self.assertEqual('<Path "self::node()">', repr(path))
self.assertEqual('<root><elem/></root>', path.select(xml).render())
def test_1step_self(self):
xml = XML('<root><elem/></root>')
path = Path('.')
self.assertEqual('<Path "self::node()">', repr(path))
self.assertEqual('<root><elem/></root>', path.select(xml).render())
path = Path('self::node()')
self.assertEqual('<Path "self::node()">', repr(path))
self.assertEqual('<root><elem/></root>', path.select(xml).render())
def test_3step_complex(self):
xml = XML('<root><foo><bar/></foo></root>')
path = Path('*/bar')
self.assertEqual('<Path "child::*/child::bar">', repr(path))
self.assertEqual('<bar/>', path.select(xml).render())
xml = XML('<root><foo><bar id="1"/></foo><bar id="2"/></root>')
path = Path('//bar')
self.assertEqual('<Path "descendant-or-self::node()/child::bar">',
repr(path))
self.assertEqual('<bar id="1"/><bar id="2"/>',
path.select(xml).render())
def test_predicate_termination(self):
"""
Verify that a patch matching the self axis with a predicate doesn't
cause an infinite loop. See <http://genshi.edgewall.org/ticket/82>.
"""
xml = XML('<ul flag="1"><li>a</li><li>b</li></ul>')
path = Path('.[@flag="1"]/*')
self.assertEqual('<li>a</li><li>b</li>', path.select(xml).render())
xml = XML('<ul flag="1"><li>a</li><li>b</li></ul>')
path = Path('.[@flag="0"]/*')
self.assertEqual('', path.select(xml).render())
def test_predicate_termination(self):
"""
Verify that a patch matching the self axis with a predicate doesn't
cause an infinite loop. See <http://genshi.edgewall.org/ticket/82>.
"""
xml = XML('<ul flag="1"><li>a</li><li>b</li></ul>')
path = Path('.[@flag="1"]/*')
self.assertEqual('<li>a</li><li>b</li>', path.select(xml).render())
xml = XML('<ul flag="1"><li>a</li><li>b</li></ul>')
path = Path('.[@flag="0"]/*')
self.assertEqual('', path.select(xml).render())
def test_3step_complex(self):
xml = XML('<root><foo><bar/></foo></root>')
path = Path('*/bar')
self.assertEqual('<Path "child::*/child::bar">', repr(path))
self.assertEqual('<bar/>', path.select(xml).render())
xml = XML('<root><foo><bar id="1"/></foo><bar id="2"/></root>')
path = Path('//bar')
self.assertEqual('<Path "descendant-or-self::node()/child::bar">',
repr(path))
self.assertEqual('<bar id="1"/><bar id="2"/>',
path.select(xml).render())
def test_1step_attribute(self):
path = Path('@foo')
self.assertEqual('<Path "attribute::foo">', repr(path))
xml = XML('<root/>')
self.assertEqual('', path.select(xml).render())
xml = XML('<root foo="bar"/>')
self.assertEqual('bar', path.select(xml).render())
path = Path('./@foo')
self.assertEqual('<Path "self::node()/attribute::foo">', repr(path))
self.assertEqual('bar', path.select(xml).render())
def test_node_type_processing_instruction(self):
xml = XML('<?python x = 2 * 3 ?><root><?php echo("x") ?></root>')
path = Path('processing-instruction()')
self.assertEqual('<Path "child::processing-instruction()">',
repr(path))
self.assertEqual('<?python x = 2 * 3 ?><?php echo("x") ?>',
path.select(xml).render())
path = Path('processing-instruction("php")')
self.assertEqual('<Path "child::processing-instruction(\"php\")">',
repr(path))
self.assertEqual('<?php echo("x") ?>', path.select(xml).render())
def test_1step_attribute(self):
path = Path('@foo')
self.assertEqual('<Path "attribute::foo">', repr(path))
xml = XML('<root/>')
self.assertEqual('', path.select(xml).render())
xml = XML('<root foo="bar"/>')
self.assertEqual('bar', path.select(xml).render())
path = Path('./@foo')
self.assertEqual('<Path "self::node()/attribute::foo">', repr(path))
self.assertEqual('bar', path.select(xml).render())
def test_node_type_processing_instruction(self):
xml = XML('<?python x = 2 * 3 ?><root><?php echo("x") ?></root>')
path = Path('processing-instruction()')
self.assertEqual('<Path "child::processing-instruction()">',
repr(path))
self.assertEqual('<?python x = 2 * 3 ?><?php echo("x") ?>',
path.select(xml).render())
path = Path('processing-instruction("php")')
self.assertEqual('<Path "child::processing-instruction(\"php\")">',
repr(path))
self.assertEqual('<?php echo("x") ?>', path.select(xml).render())
def _test_eval(self,
path,
equiv=None,
input=None,
output='',
namespaces=None,
variables=None):
path = Path(path)
if equiv is not None:
self.assertEqual(equiv, repr(path))
if input is None:
return
rendered = path.select(input,
namespaces=namespaces,
variables=variables).render(encoding=None)
msg = 'Bad output using whole path'
msg += '\nExpected:\t%r' % output
msg += '\nRendered:\t%r' % rendered
self.assertEqual(output, rendered, msg)
if len(path.paths) == 1:
self._test_strategies(input,
path.paths[0],
output,
namespaces=namespaces,
variables=variables)
def test_attrwildcard_with_namespace(self):
xml = XML('<root xmlns:f="FOO"><foo f:bar="baz"/></root>')
path = Path('foo[@f:*]')
self.assertEqual('<foo xmlns:ns1="FOO" ns1:bar="baz"/>',
path.select(xml, namespaces={
'f': 'FOO'
}).render())
def test_wildcard_with_namespace(self):
xml = XML('<root xmlns:f="FOO"><f:foo>bar</f:foo></root>')
path = Path('f:*')
self.assertEqual('<Path "child::f:*">', repr(path))
namespaces = {'f': 'FOO'}
self.assertEqual('<foo xmlns="FOO">bar</foo>',
path.select(xml, namespaces=namespaces).render())
def test_wildcard_with_namespace(self):
xml = XML('<root xmlns:f="FOO"><f:foo>bar</f:foo></root>')
path = Path('f:*')
self.assertEqual('<Path "child::f:*">', repr(path))
namespaces = {'f': 'FOO'}
self.assertEqual('<foo xmlns="FOO">bar</foo>',
path.select(xml, namespaces=namespaces).render())
def test_attr_selection(self):
xml = XML('<root><foo bar="abc"></foo></root>')
path = Path('foo/@bar')
result = path.select(xml)
self.assertEqual(list(result), [
Attrs([(QName('bar'), u'abc')])
])
def test_attr_selection_with_namespace(self):
xml = XML('<root xmlns:ns1="http://example.com">'
'<foo ns1:bar="abc"></foo>'
'</root>')
path = Path('foo/@ns1:bar')
result = path.select(xml, namespaces={'ns1': 'http://example.com'})
self.assertEqual(list(result),
[Attrs([(QName('http://example.com}bar'), 'abc')])])
def test_2step_complex(self):
xml = XML('<root><foo><bar/></foo></root>')
path = Path('foo/bar')
self.assertEqual('<Path "child::foo/child::bar">', repr(path))
self.assertEqual('<bar/>', path.select(xml).render())
path = Path('./bar')
self.assertEqual('<Path "self::node()/child::bar">', repr(path))
self.assertEqual('', path.select(xml).render())
path = Path('foo/*')
self.assertEqual('<Path "child::foo/child::*">', repr(path))
self.assertEqual('<bar/>', path.select(xml).render())
xml = XML('<root><foo><bar id="1"/></foo><bar id="2"/></root>')
path = Path('./bar')
self.assertEqual('<Path "self::node()/child::bar">', repr(path))
self.assertEqual('<bar id="2"/>', path.select(xml).render())
def test_1step_wildcard(self):
xml = XML('<root><elem/></root>')
path = Path('*')
self.assertEqual('<Path "child::*">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('child::*')
self.assertEqual('<Path "child::*">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('child::node()')
self.assertEqual('<Path "child::node()">', repr(path))
self.assertEqual('<elem/>', Path('child::node()').select(xml).render())
path = Path('//*')
self.assertEqual('<Path "descendant-or-self::node()/child::*">',
repr(path))
self.assertEqual('<root><elem/></root>', path.select(xml).render())
def test_attr_selection_with_namespace(self):
xml = XML(
'<root xmlns:ns1="http://example.com">'
'<foo ns1:bar="abc"></foo>'
'</root>')
path = Path('foo/@ns1:bar')
result = path.select(xml, namespaces={'ns1': 'http://example.com'})
self.assertEqual(list(result), [
Attrs([(QName('http://example.com}bar'), u'abc')])
])
def test_1step(self):
xml = XML('<root><elem/></root>')
path = Path('elem')
self.assertEqual('<Path "child::elem">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('child::elem')
self.assertEqual('<Path "child::elem">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('//elem')
self.assertEqual('<Path "descendant-or-self::node()/child::elem">',
repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('descendant::elem')
self.assertEqual('<Path "descendant::elem">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
def test_1step(self):
xml = XML('<root><elem/></root>')
path = Path('elem')
self.assertEqual('<Path "child::elem">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('child::elem')
self.assertEqual('<Path "child::elem">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('//elem')
self.assertEqual('<Path "descendant-or-self::node()/child::elem">',
repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('descendant::elem')
self.assertEqual('<Path "descendant::elem">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
def test_1step_wildcard(self):
xml = XML('<root><elem/></root>')
path = Path('*')
self.assertEqual('<Path "child::*">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('child::*')
self.assertEqual('<Path "child::*">', repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
path = Path('child::node()')
self.assertEqual('<Path "child::node()">', repr(path))
self.assertEqual('<elem/>', Path('child::node()').select(xml).render())
path = Path('//*')
self.assertEqual('<Path "descendant-or-self::node()/child::*">',
repr(path))
self.assertEqual('<elem/>', path.select(xml).render())
def test_2step_complex(self):
xml = XML('<root><foo><bar/></foo></root>')
path = Path('foo/bar')
self.assertEqual('<Path "child::foo/child::bar">', repr(path))
self.assertEqual('<bar/>', path.select(xml).render())
path = Path('./bar')
self.assertEqual('<Path "self::node()/child::bar">', repr(path))
self.assertEqual('', path.select(xml).render())
path = Path('foo/*')
self.assertEqual('<Path "child::foo/child::*">', repr(path))
self.assertEqual('<bar/>', path.select(xml).render())
xml = XML('<root><foo><bar id="1"/></foo><bar id="2"/></root>')
path = Path('./bar')
self.assertEqual('<Path "self::node()/child::bar">', repr(path))
self.assertEqual('<bar id="2"/>', path.select(xml).render())
def test_1step_text(self):
xml = XML('<root>Hey</root>')
path = Path('text()')
self.assertEqual('<Path "child::text()">', repr(path))
self.assertEqual('Hey', path.select(xml).render())
path = Path('./text()')
self.assertEqual('<Path "self::node()/child::text()">', repr(path))
self.assertEqual('Hey', path.select(xml).render())
path = Path('//text()')
self.assertEqual('<Path "descendant-or-self::node()/child::text()">',
repr(path))
self.assertEqual('Hey', path.select(xml).render())
path = Path('.//text()')
self.assertEqual('<Path "self::node()/descendant-or-self::node()/child::text()">',
repr(path))
self.assertEqual('Hey', path.select(xml).render())
def test_1step_text(self):
xml = XML('<root>Hey</root>')
path = Path('text()')
self.assertEqual('<Path "child::text()">', repr(path))
self.assertEqual('Hey', path.select(xml).render())
path = Path('./text()')
self.assertEqual('<Path "self::node()/child::text()">', repr(path))
self.assertEqual('Hey', path.select(xml).render())
path = Path('//text()')
self.assertEqual('<Path "descendant-or-self::node()/child::text()">',
repr(path))
self.assertEqual('Hey', path.select(xml).render())
path = Path('.//text()')
self.assertEqual('<Path "self::node()/descendant-or-self::node()/child::text()">',
repr(path))
self.assertEqual('Hey', path.select(xml).render())
def test_2step_text(self):
xml = XML('<root><item>Foo</item></root>')
path = Path('item/text()')
self.assertEqual('<Path "child::item/child::text()">', repr(path))
self.assertEqual('Foo', path.select(xml).render())
path = Path('*/text()')
self.assertEqual('<Path "child::*/child::text()">', repr(path))
self.assertEqual('Foo', path.select(xml).render())
path = Path('//text()')
self.assertEqual('<Path "descendant-or-self::node()/child::text()">',
repr(path))
self.assertEqual('Foo', path.select(xml).render())
path = Path('./text()')
self.assertEqual('<Path "self::node()/child::text()">', repr(path))
self.assertEqual('', path.select(xml).render())
xml = XML('<root><item>Foo</item><item>Bar</item></root>')
path = Path('item/text()')
self.assertEqual('<Path "child::item/child::text()">', repr(path))
self.assertEqual('FooBar', path.select(xml).render())
xml = XML('<root><item>Foo</item><item>Bar</item></root>')
self.assertEqual('FooBar', path.select(xml).render())
def test_2step_text(self):
xml = XML('<root><item>Foo</item></root>')
path = Path('item/text()')
self.assertEqual('<Path "child::item/child::text()">', repr(path))
self.assertEqual('Foo', path.select(xml).render())
path = Path('*/text()')
self.assertEqual('<Path "child::*/child::text()">', repr(path))
self.assertEqual('Foo', path.select(xml).render())
path = Path('//text()')
self.assertEqual('<Path "descendant-or-self::node()/child::text()">',
repr(path))
self.assertEqual('Foo', path.select(xml).render())
path = Path('./text()')
self.assertEqual('<Path "self::node()/child::text()">', repr(path))
self.assertEqual('', path.select(xml).render())
xml = XML('<root><item>Foo</item><item>Bar</item></root>')
path = Path('item/text()')
self.assertEqual('<Path "child::item/child::text()">', repr(path))
self.assertEqual('FooBar', path.select(xml).render())
xml = XML('<root><item>Foo</item><item>Bar</item></root>')
self.assertEqual('FooBar', path.select(xml).render())
def _test_eval(self, path, equiv=None, input=None, output='',
namespaces=None, variables=None):
path = Path(path)
if equiv is not None:
self.assertEqual(equiv, repr(path))
if input is None:
return
rendered = path.select(input, namespaces=namespaces,
variables=variables).render(encoding=None)
msg = 'Bad output using whole path'
msg += '\nExpected:\t%r' % output
msg += '\nRendered:\t%r' % rendered
self.assertEqual(output, rendered, msg)
if len(path.paths) == 1:
self._test_strategies(input, path.paths[0], output,
namespaces=namespaces, variables=variables)
def test_predicate_boolean_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[boolean("")]')
self.assertEqual('', path.select(xml).render())
path = Path('*[boolean("yo")]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[boolean(0)]')
self.assertEqual('', path.select(xml).render())
path = Path('*[boolean(42)]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[boolean(false())]')
self.assertEqual('', path.select(xml).render())
path = Path('*[boolean(true())]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_boolean_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[boolean("")]')
self.assertEqual('', path.select(xml).render())
path = Path('*[boolean("yo")]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[boolean(0)]')
self.assertEqual('', path.select(xml).render())
path = Path('*[boolean(42)]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[boolean(false())]')
self.assertEqual('', path.select(xml).render())
path = Path('*[boolean(true())]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_string_length_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[string-length(name())=3]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_string_length_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[string-length(name())=3]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_position_and_attr(self):
xml = XML('<root><foo/><foo id="a1"/><foo id="a2"/></root>')
path = Path('*[1][@id]')
self.assertEqual('', path.select(xml).render())
path = Path('*[2][@id]')
self.assertEqual('<foo id="a1"/>', path.select(xml).render())
def test_predicate_translate_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[translate(name(), "fo", "ba")="baa"]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_position(self):
xml = XML('<root><foo id="a1"/><foo id="a2"/><foo id="a3"/></root>')
path = Path('*[2]')
self.assertEqual('<foo id="a2"/>', path.select(xml).render())
def test_predicate_position(self):
xml = XML('<root><foo id="a1"/><foo id="a2"/><foo id="a3"/></root>')
path = Path('*[2]')
self.assertEqual('<foo id="a2"/>', path.select(xml).render())
def test_predicate_true_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[true()]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_substring_before_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[substring-before(name(), "oo")="f"]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_attr_or(self):
xml = XML('<root><item/><item important="very"/></root>')
path = Path('item[@urgent or @important]')
self.assertEqual('<item important="very"/>', path.select(xml).render())
path = Path('item[@urgent or @notso]')
self.assertEqual('', path.select(xml).render())
def test_predicate_floor_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[floor("4.5")=4]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_normalize_space_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[normalize-space(" foo bar ")="foo bar"]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_round_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[round("4.4")=4]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[round("4.6")=5]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_substring_before_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[substring-before(name(), "oo")="f"]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_contains_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[contains(name(), "oo")]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_translate_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[translate(name(), "fo", "ba")="baa"]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_floor_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[floor("4.5")=4]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_variable(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[name()=$bar]')
variables = {'bar': 'foo'}
self.assertEqual('<foo>bar</foo>',
path.select(xml, variables=variables).render())
def test_predicate_normalize_space_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[normalize-space(" foo bar ")="foo bar"]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_position_and_attr(self):
xml = XML('<root><foo/><foo id="a1"/><foo id="a2"/></root>')
path = Path('*[1][@id]')
self.assertEqual('', path.select(xml).render())
path = Path('*[2][@id]')
self.assertEqual('<foo id="a1"/>', path.select(xml).render())
def test_predicate_matches_function(self):
xml = XML('<root><foo>bar</foo><bar>foo</bar></root>')
path = Path('*[matches(name(), "foo|bar")]')
self.assertEqual('<foo>bar</foo><bar>foo</bar>', path.select(xml).render())
def test_attrwildcard_with_namespace(self):
xml = XML('<root xmlns:f="FOO"><foo f:bar="baz"/></root>')
path = Path('foo[@f:*]')
self.assertEqual('<foo xmlns:ns1="FOO" ns1:bar="baz"/>',
path.select(xml, namespaces={'f': 'FOO'}).render())
def test_predicate_round_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[round("4.4")=4]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[round("4.6")=5]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_true_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[true()]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
def test_predicate_starts_with_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[starts-with(name(), "f")]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[starts-with(name(), "b")]')
self.assertEqual('', path.select(xml).render())
def test_predicate_variable(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[name()=$bar]')
variables = {'bar': 'foo'}
self.assertEqual('<foo>bar</foo>',
path.select(xml, variables=variables).render())
def test_predicate_starts_with_function(self):
xml = XML('<root><foo>bar</foo></root>')
path = Path('*[starts-with(name(), "f")]')
self.assertEqual('<foo>bar</foo>', path.select(xml).render())
path = Path('*[starts-with(name(), "b")]')
self.assertEqual('', path.select(xml).render())
