diff --git a/tests/rest/client/v2_alpha/test_password_policy.py b/tests/rest/client/v2_alpha/test_password_policy.py
new file mode 100644
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+++ b/tests/rest/client/v2_alpha/test_password_policy.py
@@ -0,0 +1,179 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 The Matrix.org Foundation C.I.C.
+#
+# 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.
+
+import json
+
+from synapse.api.constants import LoginType
+from synapse.api.errors import Codes
+from synapse.rest import admin
+from synapse.rest.client.v1 import login
+from synapse.rest.client.v2_alpha import account, password_policy, register
+
+from tests import unittest
+
+
+class PasswordPolicyTestCase(unittest.HomeserverTestCase):
+ """Tests the password policy feature and its compliance with MSC2000.
+
+ When validating a password, Synapse does the necessary checks in this order:
+
+ 1. Password is long enough
+ 2. Password contains digit(s)
+ 3. Password contains symbol(s)
+ 4. Password contains uppercase letter(s)
+ 5. Password contains lowercase letter(s)
+
+ For each test below that checks whether a password triggers the right error code,
+ that test provides a password good enough to pass the previous tests, but not the
+ one it is currently testing (nor any test that comes afterward).
+ """
+
+ servlets = [
+ admin.register_servlets_for_client_rest_resource,
+ login.register_servlets,
+ register.register_servlets,
+ password_policy.register_servlets,
+ account.register_servlets,
+ ]
+
+ def make_homeserver(self, reactor, clock):
+ self.register_url = "/_matrix/client/r0/register"
+ self.policy = {
+ "enabled": True,
+ "minimum_length": 10,
+ "require_digit": True,
+ "require_symbol": True,
+ "require_lowercase": True,
+ "require_uppercase": True,
+ }
+
+ config = self.default_config()
+ config["password_config"] = {
+ "policy": self.policy,
+ }
+
+ hs = self.setup_test_homeserver(config=config)
+ return hs
+
+ def test_get_policy(self):
+ """Tests if the /password_policy endpoint returns the configured policy."""
+
+ request, channel = self.make_request(
+ "GET", "/_matrix/client/r0/password_policy"
+ )
+ self.render(request)
+
+ self.assertEqual(channel.code, 200, channel.result)
+ self.assertEqual(
+ channel.json_body,
+ {
+ "m.minimum_length": 10,
+ "m.require_digit": True,
+ "m.require_symbol": True,
+ "m.require_lowercase": True,
+ "m.require_uppercase": True,
+ },
+ channel.result,
+ )
+
+ def test_password_too_short(self):
+ request_data = json.dumps({"username": "kermit", "password": "shorty"})
+ request, channel = self.make_request("POST", self.register_url, request_data)
+ self.render(request)
+
+ self.assertEqual(channel.code, 400, channel.result)
+ self.assertEqual(
+ channel.json_body["errcode"], Codes.PASSWORD_TOO_SHORT, channel.result,
+ )
+
+ def test_password_no_digit(self):
+ request_data = json.dumps({"username": "kermit", "password": "longerpassword"})
+ request, channel = self.make_request("POST", self.register_url, request_data)
+ self.render(request)
+
+ self.assertEqual(channel.code, 400, channel.result)
+ self.assertEqual(
+ channel.json_body["errcode"], Codes.PASSWORD_NO_DIGIT, channel.result,
+ )
+
+ def test_password_no_symbol(self):
+ request_data = json.dumps({"username": "kermit", "password": "l0ngerpassword"})
+ request, channel = self.make_request("POST", self.register_url, request_data)
+ self.render(request)
+
+ self.assertEqual(channel.code, 400, channel.result)
+ self.assertEqual(
+ channel.json_body["errcode"], Codes.PASSWORD_NO_SYMBOL, channel.result,
+ )
+
+ def test_password_no_uppercase(self):
+ request_data = json.dumps({"username": "kermit", "password": "l0ngerpassword!"})
+ request, channel = self.make_request("POST", self.register_url, request_data)
+ self.render(request)
+
+ self.assertEqual(channel.code, 400, channel.result)
+ self.assertEqual(
+ channel.json_body["errcode"], Codes.PASSWORD_NO_UPPERCASE, channel.result,
+ )
+
+ def test_password_no_lowercase(self):
+ request_data = json.dumps({"username": "kermit", "password": "L0NGERPASSWORD!"})
+ request, channel = self.make_request("POST", self.register_url, request_data)
+ self.render(request)
+
+ self.assertEqual(channel.code, 400, channel.result)
+ self.assertEqual(
+ channel.json_body["errcode"], Codes.PASSWORD_NO_LOWERCASE, channel.result,
+ )
+
+ def test_password_compliant(self):
+ request_data = json.dumps({"username": "kermit", "password": "L0ngerpassword!"})
+ request, channel = self.make_request("POST", self.register_url, request_data)
+ self.render(request)
+
+ # Getting a 401 here means the password has passed validation and the server has
+ # responded with a list of registration flows.
+ self.assertEqual(channel.code, 401, channel.result)
+
+ def test_password_change(self):
+ """This doesn't test every possible use case, only that hitting /account/password
+ triggers the password validation code.
+ """
+ compliant_password = "C0mpl!antpassword"
+ not_compliant_password = "notcompliantpassword"
+
+ user_id = self.register_user("kermit", compliant_password)
+ tok = self.login("kermit", compliant_password)
+
+ request_data = json.dumps(
+ {
+ "new_password": not_compliant_password,
+ "auth": {
+ "password": compliant_password,
+ "type": LoginType.PASSWORD,
+ "user": user_id,
+ },
+ }
+ )
+ request, channel = self.make_request(
+ "POST",
+ "/_matrix/client/r0/account/password",
+ request_data,
+ access_token=tok,
+ )
+ self.render(request)
+
+ self.assertEqual(channel.code, 400, channel.result)
+ self.assertEqual(channel.json_body["errcode"], Codes.PASSWORD_NO_DIGIT)
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