def test_getWriters(self):
        reactor = self.buildReactor()
        self.addCleanup(self.unbuildReactor, reactor)

        # Cleanup might fail if file is GCed too soon:
        self.f = f = open(self.mktemp(), "wb")

        # Have the reader added:
        stdio = StandardIO(Protocol(), stdout=f.fileno(),
                           stdin=self.extraFile.fileno(), reactor=reactor)
        self.assertNotIn(stdio._writer, reactor.getWriters())
        stdio._writer.startWriting()
        self.assertIn(stdio._writer, reactor.getWriters())
C{reactor.getWriters} includes descriptors that are filesystem files.
dataset/ETHPy150Open twisted/twisted/twisted/internet/test/test_stdio.py/StdioFilesTests.test_getWriters