Function test_io_init

IPython/utils/tests/test_io.py:53–62

Test that io.stdin/out/err exist at startup

()

            self.tchan(chan)

def test_io_init():
    """Test that io.stdin/out/err exist at startup"""
    for name in ('stdin', 'stdout', 'stderr'):
        cmd = "from IPython.utils import io;print(io.%s.__class__)"%name
        with Popen([sys.executable, '-c', cmd], stdout=PIPE) as p:
            p.wait()
            classname = p.stdout.read().strip().decode('ascii')
        # __class__ is a reference to the class object in Python 3, so we can't
        # just test for string equality.
        assert 'IPython.utils.io.IOStream' in classname, classname

class TestIOStream(unittest.TestCase):