RAHHH

backend/lib/python3.12/site-packages/twisted/test/test_tpfile.py

@@ -0,0 +1,56 @@
+# Copyright (c) Twisted Matrix Laboratories.
+# See LICENSE for details.
+
+
+from io import BytesIO
+
+from twisted.internet import abstract, defer, protocol
+from twisted.protocols import basic, loopback
+from twisted.trial import unittest
+
+
+class BufferingServer(protocol.Protocol):
+    buffer = b""
+
+    def dataReceived(self, data: bytes) -> None:
+        self.buffer += data
+
+
+class FileSendingClient(protocol.Protocol):
+    def __init__(self, f: BytesIO) -> None:
+        self.f = f
+
+    def connectionMade(self) -> None:
+        assert self.transport is not None
+        s = basic.FileSender()
+        d = s.beginFileTransfer(self.f, self.transport, lambda x: x)
+        d.addCallback(lambda r: self.transport.loseConnection())
+
+
+class FileSenderTests(unittest.TestCase):
+    def testSendingFile(self) -> defer.Deferred[None]:
+        testStr = b"xyz" * 100 + b"abc" * 100 + b"123" * 100
+        s = BufferingServer()
+        c = FileSendingClient(BytesIO(testStr))
+
+        d: defer.Deferred[None] = loopback.loopbackTCP(s, c)
+
+        def callback(x: object) -> None:
+            self.assertEqual(s.buffer, testStr)
+
+        return d.addCallback(callback)
+
+    def testSendingEmptyFile(self) -> None:
+        fileSender = basic.FileSender()
+        consumer = abstract.FileDescriptor()
+        consumer.connected = 1
+        emptyFile = BytesIO(b"")
+
+        d = fileSender.beginFileTransfer(emptyFile, consumer, lambda x: x)
+
+        # The producer will be immediately exhausted, and so immediately
+        # unregistered
+        self.assertIsNone(consumer.producer)
+
+        # Which means the Deferred from FileSender should have been called
+        self.assertTrue(d.called, "producer unregistered with deferred being called")