diff --git a/Lib/test/test_urlparse.py b/Lib/test/test_urlparse.py
@@ -103,15 +103,17 @@

class UrlParseTestCase(unittest.TestCase):

-    def checkRoundtrips(self, url, parsed, split):
        result = urllib.parse.urlparse(url)
        self.assertSequenceEqual(result, parsed)
        t = (result.scheme, result.netloc, result.path,
             result.params, result.query, result.fragment)
        self.assertSequenceEqual(t, parsed)
        # put it back together and it should be the same
        result2 = urllib.parse.urlunparse(result)
-        self.assertSequenceEqual(result2, url)
        self.assertSequenceEqual(result2, result.geturl())

        # the result of geturl() is a fixpoint; we can always parse it
@@ -137,7 +139,7 @@ def checkRoundtrips(self, url, parsed, split):
             result.query, result.fragment)
        self.assertSequenceEqual(t, split)
        result2 = urllib.parse.urlunsplit(result)
-        self.assertSequenceEqual(result2, url)
        self.assertSequenceEqual(result2, result.geturl())

        # check the fixpoint property of re-parsing the result of geturl()
@@ -175,9 +177,39 @@ def test_qs(self):

    def test_roundtrips(self):
        str_cases = [
            ('file:///tmp/junk.txt',
             ('file', '', '/tmp/junk.txt', '', '', ''),
             ('file', '', '/tmp/junk.txt', '', '')),
            ('imap://mail.python.org/mbox1',
             ('imap', 'mail.python.org', '/mbox1', '', '', ''),
             ('imap', 'mail.python.org', '/mbox1', '', '')),
@@ -213,6 +245,38 @@ def _encode(t):
        for url, parsed, split in str_cases + bytes_cases:
            self.checkRoundtrips(url, parsed, split)

    def test_http_roundtrips(self):
        # urllib.parse.urlsplit treats 'http:' as an optimized special case,
        # so we test both 'http:' and 'https:' in all the following.

diff --git a/Lib/urllib/parse.py b/Lib/urllib/parse.py
@@ -525,7 +525,7 @@ def urlunsplit(components):
    empty query; the RFC states that these are equivalent)."""
    scheme, netloc, url, query, fragment, _coerce_result = (
                                          _coerce_args(*components))
-    if netloc or (scheme and scheme in uses_netloc and url[:2] != '//'):
        if url and url[:1] != '/': url = '/' + url
        url = '//' + (netloc or '') + url
    if scheme:

diff --git a/Misc/NEWS.d/next/Library/2019-08-27-01-16-50.gh-issue-67693.4NIAiy.rst b/Misc/NEWS.d/next/Library/2019-08-27-01-16-50.gh-issue-67693.4NIAiy.rst
@@ -0,0 +1,2 @@