Add test cases based on RFC 1808. So now we actually have a test suite

the urljoin() function, which exercises the urlparse() and urlunparse()
functions as side effects.

(Moshe, why did we have perfectly empty tests checked in for this?)

Lib/test/output/test_urlparse

 test_urlparse
+urlparse.urljoin() tests
+
+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'
+              = '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'
+0 errors

Lib/test/test_urlparse.py

+import urlparse
+
+errors = 0
+
+RFC1808_BASE = "http://a/b/c/d;p?q#f"
+
+def checkJoin(relurl, expected):
+    global errors
+    result = urlparse.urljoin(RFC1808_BASE, relurl)
+    print "%-13s = %r" % (relurl, result)
+    if result != expected:
+        errors += 1
+        print "urljoin(%r, %r)" % (RFC1808_BASE, relurl)
+        print ("expected %r,\n"
+               "     got %r") % (expected, result)
+
+print "urlparse.urljoin() tests"
+print
+
+# "normal" cases from RFC 1808:
+checkJoin('g:h', 'g:h')
+checkJoin('g', 'http://a/b/c/g')
+checkJoin('./g', 'http://a/b/c/g')
+checkJoin('g/', 'http://a/b/c/g/')
+checkJoin('/g', 'http://a/g')
+checkJoin('//g', 'http://g')
+checkJoin('?y', 'http://a/b/c/d;p?y')
+checkJoin('g?y', 'http://a/b/c/g?y')
+checkJoin('g?y/./x', 'http://a/b/c/g?y/./x')
+checkJoin('#s', 'http://a/b/c/d;p?q#s')
+checkJoin('g#s', 'http://a/b/c/g#s')
+checkJoin('g#s/./x', 'http://a/b/c/g#s/./x')
+checkJoin('g?y#s', 'http://a/b/c/g?y#s')
+checkJoin(';x', 'http://a/b/c/d;x')
+checkJoin('g;x', 'http://a/b/c/g;x')
+checkJoin('g;x?y#s', 'http://a/b/c/g;x?y#s')
+checkJoin('.', 'http://a/b/c/')
+checkJoin('./', 'http://a/b/c/')
+checkJoin('..', 'http://a/b/')
+checkJoin('../', 'http://a/b/')
+checkJoin('../g', 'http://a/b/g')
+checkJoin('../..', 'http://a/')
+checkJoin('../../', 'http://a/')
+checkJoin('../../g', 'http://a/g')
+
+# "abnormal" cases from RFC 1808:
+checkJoin('', 'http://a/b/c/d;p?q#f')
+checkJoin('../../../g', 'http://a/../g')
+checkJoin('../../../../g', 'http://a/../../g')
+checkJoin('/./g', 'http://a/./g')
+checkJoin('/../g', 'http://a/../g')
+checkJoin('g.', 'http://a/b/c/g.')
+checkJoin('.g', 'http://a/b/c/.g')
+checkJoin('g..', 'http://a/b/c/g..')
+checkJoin('..g', 'http://a/b/c/..g')
+checkJoin('./../g', 'http://a/b/g')
+checkJoin('./g/.', 'http://a/b/c/g/')
+checkJoin('g/./h', 'http://a/b/c/g/h')
+checkJoin('g/../h', 'http://a/b/c/h')
+
+# RFC 1808 and RFC 1630 disagree on these (according to RFC 1808),
+# so we'll not actually run these tests (which expect 1808 behavior).
+#checkJoin('http:g', 'http:g')
+#checkJoin('http:', 'http:')
+
+print errors, "errors"