upload test requires pypirc to avoid password prompt

tests/test_server.py

@@ -235,9 +235,18 @@ def pypirc_file(txt):
 @pytest.mark.parametrize("pkg_frmt", ['bdist', 'bdist_wheel'])
 def test_setuptoolsUpload_open(empty_packdir, port, project, package,
                                pkg_frmt):
+    url = _build_url(port, None, None)
+    with pypirc_file(dedent("""\
+            [distutils]
+            index-servers: test
+
+            [test]
+            repository: %s
+            username: ''
+            password: ''
+        """ % url)):
         with new_server(empty_packdir, port):
             with chdir(project.strpath):
-            url = _build_url(port, None, None)
                 cmd = "setup.py -vvv %s upload -r %s" % (pkg_frmt, url)
                 for i in range(5):
                     print('++Attempt #%s' % i)