diff --git a/tests/scripts/test_new_matrix_user.py b/tests/scripts/test_new_matrix_user.py
new file mode 100644
index 0000000000..6f56893f5e
--- /dev/null
+++ b/tests/scripts/test_new_matrix_user.py
@@ -0,0 +1,160 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from mock import Mock
+
+from synapse._scripts.register_new_matrix_user import request_registration
+
+from tests.unittest import TestCase
+
+
+class RegisterTestCase(TestCase):
+ def test_success(self):
+ """
+ The script will fetch a nonce, and then generate a MAC with it, and then
+ post that MAC.
+ """
+
+ def get(url, verify=None):
+ r = Mock()
+ r.status_code = 200
+ r.json = lambda: {"nonce": "a"}
+ return r
+
+ def post(url, json=None, verify=None):
+ # Make sure we are sent the correct info
+ self.assertEqual(json["username"], "user")
+ self.assertEqual(json["password"], "pass")
+ self.assertEqual(json["nonce"], "a")
+ # We want a 40-char hex MAC
+ self.assertEqual(len(json["mac"]), 40)
+
+ r = Mock()
+ r.status_code = 200
+ return r
+
+ requests = Mock()
+ requests.get = get
+ requests.post = post
+
+ # The fake stdout will be written here
+ out = []
+ err_code = []
+
+ request_registration(
+ "user",
+ "pass",
+ "matrix.org",
+ "shared",
+ admin=False,
+ requests=requests,
+ _print=out.append,
+ exit=err_code.append,
+ )
+
+ # We should get the success message making sure everything is OK.
+ self.assertIn("Success!", out)
+
+ # sys.exit shouldn't have been called.
+ self.assertEqual(err_code, [])
+
+ def test_failure_nonce(self):
+ """
+ If the script fails to fetch a nonce, it throws an error and quits.
+ """
+
+ def get(url, verify=None):
+ r = Mock()
+ r.status_code = 404
+ r.reason = "Not Found"
+ r.json = lambda: {"not": "error"}
+ return r
+
+ requests = Mock()
+ requests.get = get
+
+ # The fake stdout will be written here
+ out = []
+ err_code = []
+
+ request_registration(
+ "user",
+ "pass",
+ "matrix.org",
+ "shared",
+ admin=False,
+ requests=requests,
+ _print=out.append,
+ exit=err_code.append,
+ )
+
+ # Exit was called
+ self.assertEqual(err_code, [1])
+
+ # We got an error message
+ self.assertIn("ERROR! Received 404 Not Found", out)
+ self.assertNotIn("Success!", out)
+
+ def test_failure_post(self):
+ """
+ The script will fetch a nonce, and then if the final POST fails, will
+ report an error and quit.
+ """
+
+ def get(url, verify=None):
+ r = Mock()
+ r.status_code = 200
+ r.json = lambda: {"nonce": "a"}
+ return r
+
+ def post(url, json=None, verify=None):
+ # Make sure we are sent the correct info
+ self.assertEqual(json["username"], "user")
+ self.assertEqual(json["password"], "pass")
+ self.assertEqual(json["nonce"], "a")
+ # We want a 40-char hex MAC
+ self.assertEqual(len(json["mac"]), 40)
+
+ r = Mock()
+ # Then 500 because we're jerks
+ r.status_code = 500
+ r.reason = "Broken"
+ return r
+
+ requests = Mock()
+ requests.get = get
+ requests.post = post
+
+ # The fake stdout will be written here
+ out = []
+ err_code = []
+
+ request_registration(
+ "user",
+ "pass",
+ "matrix.org",
+ "shared",
+ admin=False,
+ requests=requests,
+ _print=out.append,
+ exit=err_code.append,
+ )
+
+ # Exit was called
+ self.assertEqual(err_code, [1])
+
+ # We got an error message
+ self.assertIn("ERROR! Received 500 Broken", out)
+ self.assertNotIn("Success!", out)
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