diff --git a/tests/server.py b/tests/server.py
new file mode 100644
index 0000000000..73069dff52
--- /dev/null
+++ b/tests/server.py
@@ -0,0 +1,181 @@
+from io import BytesIO
+
+import attr
+import json
+from six import text_type
+
+from twisted.python.failure import Failure
+from twisted.internet.defer import Deferred
+from twisted.test.proto_helpers import MemoryReactorClock
+
+from synapse.http.site import SynapseRequest
+from twisted.internet import threads
+from tests.utils import setup_test_homeserver as _sth
+
+
+@attr.s
+class FakeChannel(object):
+ """
+ A fake Twisted Web Channel (the part that interfaces with the
+ wire).
+ """
+
+ result = attr.ib(factory=dict)
+
+ @property
+ def json_body(self):
+ if not self.result:
+ raise Exception("No result yet.")
+ return json.loads(self.result["body"])
+
+ def writeHeaders(self, version, code, reason, headers):
+ self.result["version"] = version
+ self.result["code"] = code
+ self.result["reason"] = reason
+ self.result["headers"] = headers
+
+ def write(self, content):
+ if "body" not in self.result:
+ self.result["body"] = b""
+
+ self.result["body"] += content
+
+ def requestDone(self, _self):
+ self.result["done"] = True
+
+ def getPeer(self):
+ return None
+
+ def getHost(self):
+ return None
+
+ @property
+ def transport(self):
+ return self
+
+
+class FakeSite:
+ """
+ A fake Twisted Web Site, with mocks of the extra things that
+ Synapse adds.
+ """
+
+ server_version_string = b"1"
+ site_tag = "test"
+
+ @property
+ def access_logger(self):
+ class FakeLogger:
+ def info(self, *args, **kwargs):
+ pass
+
+ return FakeLogger()
+
+
+def make_request(method, path, content=b""):
+ """
+ Make a web request using the given method and path, feed it the
+ content, and return the Request and the Channel underneath.
+ """
+
+ if isinstance(content, text_type):
+ content = content.encode('utf8')
+
+ site = FakeSite()
+ channel = FakeChannel()
+
+ req = SynapseRequest(site, channel)
+ req.process = lambda: b""
+ req.content = BytesIO(content)
+ req.requestReceived(method, path, b"1.1")
+
+ return req, channel
+
+
+def wait_until_result(clock, channel, timeout=100):
+ """
+ Wait until the channel has a result.
+ """
+ clock.run()
+ x = 0
+
+ while not channel.result:
+ x += 1
+
+ if x > timeout:
+ raise Exception("Timed out waiting for request to finish.")
+
+ clock.advance(0.1)
+
+
+class ThreadedMemoryReactorClock(MemoryReactorClock):
+ """
+ A MemoryReactorClock that supports callFromThread.
+ """
+ def callFromThread(self, callback, *args, **kwargs):
+ """
+ Make the callback fire in the next reactor iteration.
+ """
+ d = Deferred()
+ d.addCallback(lambda x: callback(*args, **kwargs))
+ self.callLater(0, d.callback, True)
+ return d
+
+
+def setup_test_homeserver(*args, **kwargs):
+ """
+ Set up a synchronous test server, driven by the reactor used by
+ the homeserver.
+ """
+ d = _sth(*args, **kwargs).result
+
+ # Make the thread pool synchronous.
+ clock = d.get_clock()
+ pool = d.get_db_pool()
+
+ def runWithConnection(func, *args, **kwargs):
+ return threads.deferToThreadPool(
+ pool._reactor,
+ pool.threadpool,
+ pool._runWithConnection,
+ func,
+ *args,
+ **kwargs
+ )
+
+ def runInteraction(interaction, *args, **kwargs):
+ return threads.deferToThreadPool(
+ pool._reactor,
+ pool.threadpool,
+ pool._runInteraction,
+ interaction,
+ *args,
+ **kwargs
+ )
+
+ pool.runWithConnection = runWithConnection
+ pool.runInteraction = runInteraction
+
+ class ThreadPool:
+ """
+ Threadless thread pool.
+ """
+ def start(self):
+ pass
+
+ def callInThreadWithCallback(self, onResult, function, *args, **kwargs):
+ def _(res):
+ if isinstance(res, Failure):
+ onResult(False, res)
+ else:
+ onResult(True, res)
+
+ d = Deferred()
+ d.addCallback(lambda x: function(*args, **kwargs))
+ d.addBoth(_)
+ clock._reactor.callLater(0, d.callback, True)
+ return d
+
+ clock.threadpool = ThreadPool()
+ pool.threadpool = ThreadPool()
+ return d
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