# Copyright (c) 2004 Divmod.
# See LICENSE for details.

import urlparse, urllib

from nevow import context, url, inevow, util, loaders
from nevow import tags
from nevow.testutil import TestCase, FakeRequest
from nevow.flat import flatten

theurl = "http://www.foo.com:80/a/nice/path/?zot=23&zut"

# RFC1808 relative tests. Not all of these pass yet.
rfc1808_relative_link_base='http://a/b/c/d;p?q#f'
rfc1808_relative_link_tests = [
    # "Normal"
    ('g:h', 'g:h'),
    ('g', 'http://a/b/c/g'),
    ('./g', 'http://a/b/c/g'),
    ('g/', 'http://a/b/c/g/'),
    ('/g', 'http://a/g'),
    ('//g', 'http://g'),
    ('?y', 'http://a/b/c/d;p?y'),
    ('g?y', 'http://a/b/c/g?y'),
    ('g?y/./x', 'http://a/b/c/g?y/./x'),
    ('#s', 'http://a/b/c/d;p?q#s'),
    ('g#s', 'http://a/b/c/g#s'),
    ('g#s/./x', 'http://a/b/c/g#s/./x'),
    ('g?y#s', 'http://a/b/c/g?y#s'),
    #(';x', 'http://a/b/c/d;x'),
    ('g;x', 'http://a/b/c/g;x'),
    ('g;x?y#s', 'http://a/b/c/g;x?y#s'),
    ('.', 'http://a/b/c/'),
    ('./', 'http://a/b/c/'),
    ('..', 'http://a/b/'),
    ('../', 'http://a/b/'),
    ('../g', 'http://a/b/g'),
    #('../..', 'http://a/'),
    #('../../', 'http://a/'),
    ('../../g', 'http://a/g'),
    
    # "Abnormal"
    ('', 'http://a/b/c/d;p?q#f'),
    #('../../../g', 'http://a/../g'),
    #('../../../../g', 'http://a/../../g'),
    #('/./g', 'http://a/./g'),
    #('/../g', 'http://a/../g'),
    ('g.', 'http://a/b/c/g.'),
    ('.g', 'http://a/b/c/.g'),
    ('g..', 'http://a/b/c/g..'),
    ('..g', 'http://a/b/c/..g'),
    ('./../g', 'http://a/b/g'),
    ('./g/.', 'http://a/b/c/g/'),
    ('g/./h', 'http://a/b/c/g/h'),
    ('g/../h', 'http://a/b/c/h'),
    #('http:g', 'http:g'),          # Not sure whether the spec means
    #('http:', 'http:'),            # these two are valid tests or not.
    ]


class FR(FakeRequest):
    def prePathURL(Self):
        return theurl

class TestURL(TestCase):
    def test_fromString(self):
        urlpath = url.URL.fromString(theurl)
        self.assertEquals(theurl, str(urlpath))

    def test_roundtrip(self):
        tests = (
            "http://localhost",
            "http://localhost/",
            "http://localhost/foo",
            "http://localhost/foo/",
            "http://localhost/foo!!bar/",
            "http://localhost/foo%20bar/",
            "http://localhost/foo%2Fbar/",
            "http://localhost/foo?n",
            "http://localhost/foo?n=v",
            "http://localhost/foo?n=%2Fa%2Fb",
            "http://example.com/foo!%40%24bar?b!%40z=123",
            "http://localhost/asd?a=asd%20sdf%2F345",
            )
        for test in tests:
            result = str(url.URL.fromString(test))
            self.assertEquals(test, result)

    def test_fromRequest(self):
        """
        Test that url.URL.fromRequest returns an url based on request.uri
        whatever the prePath is.
        """
        r = FakeRequest(uri='/a/b/c')
        urlpath = url.URL.fromRequest(r)
        self.assertEquals('http://localhost/a/b/c', str(urlpath))

        r.prepath = ['a']
        urlpath = url.URL.fromRequest(r)
        self.assertEquals('http://localhost/a/b/c', str(urlpath))

        r = FakeRequest(uri='/a/b/c?foo=bar')
        r.prepath = ['a','b']
        urlpath = url.URL.fromRequest(r)
        self.assertEquals('http://localhost/a/b/c?foo=bar', str(urlpath))
        
    def test_fromContext(self):
        """
        Test that url.URL.fromContext returns an url based on the
        prePath whatever the url actually is.
        """
        r = FakeRequest(uri='/a/b/c')
        urlpath = url.URL.fromContext(context.RequestContext(tag=r))
        self.assertEquals('http://localhost/', str(urlpath))

        r.prepath = ['a']
        urlpath = url.URL.fromContext(context.RequestContext(tag=r))
        self.assertEquals('http://localhost/a', str(urlpath))

        r = FakeRequest(uri='/a/b/c?foo=bar')
        r.prepath = ['a','b']
        urlpath = url.URL.fromContext(context.RequestContext(tag=r))
        self.assertEquals('http://localhost/a/b?foo=bar', str(urlpath))

    def test_fromHere(self):
        """
        Test that url.URL.fromHere returns an url based on the
        prePath whatever the url actually is.
        """
        r = FakeRequest(uri='/a/b/c')
        urlpath = url.URL.fromHere(r)
        self.assertEquals('http://localhost/', str(urlpath))

        r.prepath = ['a']
        urlpath = url.URL.fromHere(r)
        self.assertEquals('http://localhost/a', str(urlpath))

        r = FakeRequest(uri='/a/b/c?foo=bar')
        r.prepath = ['a','b']
        urlpath = url.URL.fromHere(r)
        self.assertEquals('http://localhost/a/b?foo=bar', str(urlpath))
        
        
    def test_equality(self):
        urlpath = url.URL.fromString(theurl)
        self.failUnlessEqual(urlpath, url.URL.fromString(theurl))
        self.failIfEqual(urlpath, url.URL.fromString('ftp://www.anotherinvaliddomain.com/foo/bar/baz/?zot=21&zut'))

    def test_parent(self):
        urlpath = url.URL.fromString(theurl)
        self.assertEquals("http://www.foo.com:80/a/nice/?zot=23&zut",
                          str(urlpath.parent()))
    
    def test_parentdir(self):
        urlpath = url.URL.fromString(theurl)
        self.assertEquals("http://www.foo.com:80/a/nice/?zot=23&zut",
                          str(urlpath.parentdir()))
        urlpath = url.URL.fromString('http://www.foo.com/a')
        self.assertEquals("http://www.foo.com/",
                          str(urlpath.parentdir()))
        urlpath = url.URL.fromString('http://www.foo.com/a/')
        self.assertEquals("http://www.foo.com/",
                          str(urlpath.parentdir()))
        urlpath = url.URL.fromString('http://www.foo.com/a/b')
        self.assertEquals("http://www.foo.com/",
                          str(urlpath.parentdir()))
        urlpath = url.URL.fromString('http://www.foo.com/a/b/')
        self.assertEquals("http://www.foo.com/a/",
                          str(urlpath.parentdir()))
        urlpath = url.URL.fromString('http://www.foo.com/a/b/c')
        self.assertEquals("http://www.foo.com/a/",
                          str(urlpath.parentdir()))
        urlpath = url.URL.fromString('http://www.foo.com/a/b/c/')
        self.assertEquals("http://www.foo.com/a/b/",
                          str(urlpath.parentdir()))
        urlpath = url.URL.fromString('http://www.foo.com/a/b/c/d')
        self.assertEquals("http://www.foo.com/a/b/",
                          str(urlpath.parentdir()))
        urlpath = url.URL.fromString('http://www.foo.com/a/b/c/d/')
        self.assertEquals("http://www.foo.com/a/b/c/",
                          str(urlpath.parentdir()))

    def test_parent_root(self):
        urlpath = url.URL.fromString('http://www.foo.com/')
        self.assertEquals("http://www.foo.com/",
                          str(urlpath.parentdir()))
        self.assertEquals("http://www.foo.com/",
                          str(urlpath.parentdir().parentdir()))

    def test_child(self):
        urlpath = url.URL.fromString(theurl)
        self.assertEquals("http://www.foo.com:80/a/nice/path/gong?zot=23&zut",
                          str(urlpath.child('gong')))
        self.assertEquals("http://www.foo.com:80/a/nice/path/gong%2F?zot=23&zut",
                          str(urlpath.child('gong/')))
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/gong%2Fdouble?zot=23&zut",
            str(urlpath.child('gong/double')))
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/gong%2Fdouble%2F?zot=23&zut",
            str(urlpath.child('gong/double/')))

    def test_child_init_tuple(self):
        self.assertEquals(
            "http://www.foo.com/a/b/c",
            str(url.URL(netloc="www.foo.com",
                        pathsegs=['a', 'b']).child("c")))

    def test_child_init_root(self):
        self.assertEquals(
            "http://www.foo.com/c",
            str(url.URL(netloc="www.foo.com").child("c")))

    def test_sibling(self):
        urlpath = url.URL.fromString(theurl)
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/sister?zot=23&zut",
            str(urlpath.sibling('sister')))
        # use an url without trailing '/' to check child removal
        theurl2 = "http://www.foo.com:80/a/nice/path?zot=23&zut"
        urlpath = url.URL.fromString(theurl2)
        self.assertEquals(
            "http://www.foo.com:80/a/nice/sister?zot=23&zut",
            str(urlpath.sibling('sister')))

    def test_curdir(self):
        urlpath = url.URL.fromString(theurl)
        self.assertEquals(theurl, str(urlpath))
        # use an url without trailing '/' to check object removal
        theurl2 = "http://www.foo.com:80/a/nice/path?zot=23&zut"
        urlpath = url.URL.fromString(theurl2)
        self.assertEquals("http://www.foo.com:80/a/nice/?zot=23&zut",
                          str(urlpath.curdir()))
        
    def test_click(self):
        urlpath = url.URL.fromString(theurl)
        # a null uri should be valid (return here)
        self.assertEquals("http://www.foo.com:80/a/nice/path/?zot=23&zut",
                          str(urlpath.click("")))
        # a simple relative path remove the query
        self.assertEquals("http://www.foo.com:80/a/nice/path/click",
                          str(urlpath.click("click")))
        # an absolute path replace path and query
        self.assertEquals("http://www.foo.com:80/click",
                          str(urlpath.click("/click")))
        # replace just the query
        self.assertEquals("http://www.foo.com:80/a/nice/path/?burp",
                          str(urlpath.click("?burp")))
        # one full url to another should not generate '//' between netloc and pathsegs 
        self.failIfIn("//foobar", str(urlpath.click('http://www.foo.com:80/foobar')))

        # from a url with no query clicking a url with a query,
        # the query should be handled properly
        u = url.URL.fromString('http://www.foo.com:80/me/noquery')
        self.failUnlessEqual('http://www.foo.com:80/me/17?spam=158',
                             str(u.click('/me/17?spam=158')))
                             
        # Check that everything from the path onward is removed when the click link
        # has no path.
        u = url.URL.fromString('http://localhost/foo?abc=def')
        self.failUnlessEqual(str(u.click('http://www.python.org')), 'http://www.python.org/')
        
    def test_clickCollapse(self):
        tests = [
            ['http://localhost/', '.', 'http://localhost/'],
            ['http://localhost/', '..', 'http://localhost/'],
            ['http://localhost/a/b/c', '.', 'http://localhost/a/b/'],
            ['http://localhost/a/b/c', '..', 'http://localhost/a/'],
            ['http://localhost/a/b/c', './d/e', 'http://localhost/a/b/d/e'],
            ['http://localhost/a/b/c', '../d/e', 'http://localhost/a/d/e'],
            ['http://localhost/a/b/c', '/./d/e', 'http://localhost/d/e'],
            ['http://localhost/a/b/c', '/../d/e', 'http://localhost/d/e'],
            ['http://localhost/a/b/c/', '../../d/e/', 'http://localhost/a/d/e/'],
            ['http://localhost/a/./c', '../d/e', 'http://localhost/d/e'],
            ['http://localhost/a/./c/', '../d/e', 'http://localhost/a/d/e'],
            ['http://localhost/a/b/c/d', './e/../f/../g', 'http://localhost/a/b/c/g'],
            ['http://localhost/a/b/c', 'd//e', 'http://localhost/a/b/d//e'],
            ]
        for start, click, result in tests:
            self.assertEquals(
                str(url.URL.fromString(start).click(click)),
                result
                )
        
    def test_add(self):
        urlpath = url.URL.fromString(theurl)
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=23&zut&burp",
            str(urlpath.add("burp")))
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=23&zut&burp=xxx",
            str(urlpath.add("burp", "xxx")))
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=23&zut&burp=xxx&zing",
            str(urlpath.add("burp", "xxx").add("zing")))
        # note the inversion!
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=23&zut&zing&burp=xxx",
            str(urlpath.add("zing").add("burp", "xxx")))
        # note the two values for the same name
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=23&zut&burp=xxx&zot=32",
            str(urlpath.add("burp", "xxx").add("zot", 32)))

    def test_add_noquery(self):
        # fromString is a different code path, test them both
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?foo=bar",
            str(url.URL.fromString("http://www.foo.com:80/a/nice/path/")
                .add("foo", "bar")))
        self.assertEquals(
            "http://www.foo.com/?foo=bar",
            str(url.URL(netloc="www.foo.com").add("foo", "bar")))

    def test_replace(self):
        urlpath = url.URL.fromString(theurl)    
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=32&zut",
            str(urlpath.replace("zot", 32)))
        # replace name without value with name/value and vice-versa
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot&zut=itworked",
            str(urlpath.replace("zot").replace("zut", "itworked")))
        # Q: what happens when the query has two values and we replace?
        # A: we replace both values with a single one
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=32&zut",
            str(urlpath.add("zot", "xxx").replace("zot", 32)))

    def test_fragment(self):
        urlpath = url.URL.fromString(theurl)
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=23&zut#hiboy",
            str(urlpath.anchor("hiboy")))
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=23&zut",
            str(urlpath.anchor()))
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=23&zut",
            str(urlpath.anchor('')))

    def test_clear(self):
        urlpath = url.URL.fromString(theurl)    
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zut",
            str(urlpath.clear("zot")))
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zot=23",
            str(urlpath.clear("zut")))
        # something stranger, query with two values, both should get cleared
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/?zut",
            str(urlpath.add("zot", 1971).clear("zot")))
        # two ways to clear the whole query
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/",
            str(urlpath.clear("zut").clear("zot")))
        self.assertEquals(
            "http://www.foo.com:80/a/nice/path/",
            str(urlpath.clear()))

    def test_secure(self):
        self.assertEquals(str(url.URL.fromString('http://localhost/').secure()), 'https://localhost/')
        self.assertEquals(str(url.URL.fromString('http://localhost/').secure(True)), 'https://localhost/')
        self.assertEquals(str(url.URL.fromString('https://localhost/').secure()), 'https://localhost/')
        self.assertEquals(str(url.URL.fromString('https://localhost/').secure(False)), 'http://localhost/')
        self.assertEquals(str(url.URL.fromString('http://localhost/').secure(False)), 'http://localhost/')
        self.assertEquals(str(url.URL.fromString('http://localhost/foo').secure()), 'https://localhost/foo')
        self.assertEquals(str(url.URL.fromString('http://localhost/foo?bar=1').secure()), 'https://localhost/foo?bar=1')
        self.assertEquals(str(url.URL.fromString('http://localhost/').secure(port=443)), 'https://localhost/')
        self.assertEquals(str(url.URL.fromString('http://localhost:8080/').secure(port=8443)), 'https://localhost:8443/')
        self.assertEquals(str(url.URL.fromString('https://localhost:8443/').secure(False, 8080)), 'http://localhost:8080/')
        

    def test_eq_same(self):
        u = url.URL.fromString('http://localhost/')
        self.failUnless(u == u, "%r != itself" % u)

    def test_eq_similar(self):
        u1 = url.URL.fromString('http://localhost/')
        u2 = url.URL.fromString('http://localhost/')
        self.failUnless(u1 == u2, "%r != %r" % (u1, u2))

    def test_eq_different(self):
        u1 = url.URL.fromString('http://localhost/a')
        u2 = url.URL.fromString('http://localhost/b')
        self.failIf(u1 == u2, "%r != %r" % (u1, u2))

    def test_eq_apples_vs_oranges(self):
        u = url.URL.fromString('http://localhost/')
        self.failIf(u == 42, "URL must not equal a number.")
        self.failIf(u == object(), "URL must not equal an object.")

    def test_ne_same(self):
        u = url.URL.fromString('http://localhost/')
        self.failIf(u != u, "%r == itself" % u)

    def test_ne_similar(self):
        u1 = url.URL.fromString('http://localhost/')
        u2 = url.URL.fromString('http://localhost/')
        self.failIf(u1 != u2, "%r == %r" % (u1, u2))

    def test_ne_different(self):
        u1 = url.URL.fromString('http://localhost/a')
        u2 = url.URL.fromString('http://localhost/b')
        self.failUnless(u1 != u2, "%r == %r" % (u1, u2))

    def test_ne_apples_vs_oranges(self):
        u = url.URL.fromString('http://localhost/')
        self.failUnless(u != 42, "URL must differ from a number.")
        self.failUnless(u != object(), "URL must be differ from an object.")
        
    def test_parseEqualInParamValue(self):
        u = url.URL.fromString('http://localhost/?=x=x=x')
        self.failUnless(u.query == ['=x=x=x'])
        self.failUnless(str(u) == 'http://localhost/?=x%3Dx%3Dx')
        u = url.URL.fromString('http://localhost/?foo=x=x=x&bar=y')
        self.failUnless(u.query == ['foo=x=x=x', 'bar=y'])
        self.failUnless(str(u) == 'http://localhost/?foo=x%3Dx%3Dx&bar=y')

class Serialization(TestCase):
    
    def testQuoting(self):
        context = None
        scheme = 'http'
        loc = 'localhost'
        path = ('baz', 'buz', '/fuzz/')
        query = [("foo", "bar"), ("baz", "=quux"), ("foobar", "?")]
        fragment = 'futz'
        u = url.URL(scheme, loc, path, query, fragment)
        s = flatten(url.URL(scheme, loc, path, query, fragment))
        
        parsedScheme, parsedLoc, parsedPath, parsedQuery, parsedFragment = urlparse.urlsplit(s)
        
        self.assertEquals(scheme, parsedScheme)
        self.assertEquals(loc, parsedLoc)
        self.assertEquals('/' + '/'.join(map(lambda p: urllib.quote(p,safe=''),path)), parsedPath)
        self.assertEquals(query, url.unquerify(parsedQuery))
        self.assertEquals(fragment, parsedFragment)

    def test_slotQueryParam(self):
        original = 'http://foo/bar?baz=bamf'
        u = url.URL.fromString(original)
        u = u.add('toot', tags.slot('param'))

        def fillIt(ctx, data):
            ctx.fillSlots('param', 5)
            return ctx.tag

        self.assertEquals(flatten(tags.invisible(render=fillIt)[u]), original + '&toot=5')

    def test_childQueryParam(self):
        original = 'http://foo/bar'
        u = url.URL.fromString(original)
        u = u.child(tags.slot('param'))

        def fillIt(ctx, data):
            ctx.fillSlots('param', 'baz')
            return ctx.tag

        self.assertEquals(flatten(tags.invisible(render=fillIt)[u]), original + '/baz')
        
    def test_strangeSegs(self):
        base = 'http://localhost/'
        tests = (
            (r'/foo/', '%2Ffoo%2F'),
            (r'c:\foo\bar bar', 'c%3A%5Cfoo%5Cbar%20bar'),
            (r'&<>', '%26%3C%3E'),
            (u'!"\N{POUND SIGN}$%^&*()_+'.encode('utf-8'), '!%22%C2%A3%24%25%5E%26*()_%2B'),
            )
        for test, result in tests:
            u = url.URL.fromString(base).child(test)
            self.assertEquals(flatten(u), base+result)
            
    def test_urlContent(self):
        u = url.URL.fromString('http://localhost/').child(r'<c:\foo\bar&>')
        self.assertEquals(flatten(tags.p[u]), '<p>http://localhost/%3Cc%3A%5Cfoo%5Cbar%26%3E</p>')

    def test_urlAttr(self):
        u = url.URL.fromString('http://localhost/').child(r'<c:\foo\bar&>')
        self.assertEquals(flatten(tags.img(src=u)), '<img src="http://localhost/%3Cc%3A%5Cfoo%5Cbar%26%3E" />')

    def test_urlSlot(self):
        u = url.URL.fromString('http://localhost/').child(r'<c:\foo\bar&>')
        tag = tags.img(src=tags.slot('src'))
        tag.fillSlots('src', u)
        self.assertEquals(flatten(tag), '<img src="http://localhost/%3Cc%3A%5Cfoo%5Cbar%26%3E" />')

    def test_urlXmlAttrSlot(self):
        u = url.URL.fromString('http://localhost/').child(r'<c:\foo\bar&>')
        tag = tags.invisible[loaders.xmlstr('<img xmlns:n="http://nevow.com/ns/nevow/0.1" src="#"><n:attr name="src"><n:slot name="src"/></n:attr></img>')]
        tag.fillSlots('src', u)
        self.assertEquals(flatten(tag), '<img src="http://localhost/%3Cc%3A%5Cfoo%5Cbar%26%3E" />')

    def test_safe(self):
        u = url.URL.fromString('http://localhost/').child(r"foo-_.!*'()bar")
        self.assertEquals(flatten(tags.p[u]), r"<p>http://localhost/foo-_.!*'()bar</p>")

    def test_urlintagwithmultipleamps(self):
        tag = tags.invisible[tags.a(href=url.URL.fromString('http://localhost/').add('foo', 'bar').add('baz', 'spam'))]
        self.assertEquals(flatten(tag), '<a href="http://localhost/?foo=bar&amp;baz=spam"></a>')
        
        tag = tags.invisible[loaders.xmlstr('<a xmlns:n="http://nevow.com/ns/nevow/0.1" href="#"><n:attr name="href"><n:slot name="href"/></n:attr></a>')]
        tag.fillSlots('href', url.URL.fromString('http://localhost/').add('foo', 'bar').add('baz', 'spam'))
        self.assertEquals(flatten(tag), '<a href="http://localhost/?foo=bar&amp;baz=spam"></a>')
    test_urlintagwithmultipleamps.todo = "Need to fix the second half of this test"

    def test_rfc1808(self):
        """Test the relative link resolving stuff I found in rfc1808 section 5.
        """
        base = url.URL.fromString(rfc1808_relative_link_base)
        for link, result in rfc1808_relative_link_tests:
            #print link
            self.failUnlessEqual(result, flatten(base.click(link)))
    test_rfc1808.todo = 'Many of these fail miserably at the moment; often with a / where there shouldn\'t be'


class RedirectResource(TestCase):
    """Test the url redirect resource adapters.
    """

    def renderResource(self, u):
        request = FakeRequest()
        ctx = context.RequestContext(tag=request)
        return util.maybeDeferred(inevow.IResource(u).renderHTTP, ctx).addCallback(
            lambda r: (r, request.redirected_to))


    def test_urlRedirect(self):
        u = "http://localhost/"
        D = self.renderResource(url.URL.fromString(u))
        def after((html, redirected_to)):
            self.assertIn(u, html)
            self.assertEquals(u, redirected_to)
        return D.addCallback(after)


    def test_urlRedirectWithParams(self):
        D = self.renderResource(url.URL.fromString("http://localhost/").child('child').add('foo', 'bar'))
        def after((html, redirected_to)):
            self.assertIn("http://localhost/child?foo=bar", html)
            self.assertEquals("http://localhost/child?foo=bar", redirected_to)
        return D.addCallback(after)


    def test_deferredURLParam(self):
        D = self.renderResource(
            url.URL.fromString("http://localhost/")
            .child(util.succeed('child')).add('foo',util.succeed('bar'))
            )
        def after((html, redirected_to)):
            self.assertIn("http://localhost/child?foo=bar", html)
            self.assertEquals("http://localhost/child?foo=bar", redirected_to)
        return D.addCallback(after)


    def test_deferredURLOverlayParam(self):
        D = self.renderResource(url.here.child(util.succeed('child')).add('foo',util.succeed('bar')))
        def after((html, redirected_to)):
            self.assertIn("http://localhost/child?foo=bar", html)
            self.assertEquals("http://localhost/child?foo=bar", redirected_to)
        return D.addCallback(after)