sources for test_dupfile.py [rev. unknown]

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import py

def test_dupfile():

    somefile = py.std.os.tmpfile()

    flist = []

    for i in range(5):

        nf = py.io.dupfile(somefile)

        assert nf != somefile

        assert nf.fileno() != somefile.fileno()

        assert nf not in flist

        print >>nf, i,

        flist.append(nf)

    for i in range(5):

        f = flist[i]

        f.close()

    somefile.seek(0)

    s = somefile.read()

    assert s.startswith("01234")

    somefile.close()