def getTransfer(iso_packets=0):
# Dummy handle
return usb1.USBTransfer(
context=None,
handle=None,
iso_packets=iso_packets,
before_submit=lambda x: None,
after_completion=lambda x: None,
registerFinalizer=lambda handle, finalizer: None,
unregisterFinalizer=lambda handle: None,
)
def testUSBTransferMayRaiseUSBError(self):
"""
mayRaiseUSBError needs to be a class property to be reliably able
to call it during interpreter shutdown. But setting a function as
property makes it bound to the instance when accessed. This is not
obviously visible because mayRaiseUSBError has a should-never-be-used
second argument for exactly the same purpose, but which accidentally
receives the value intended as the first parameter (the first parameter
being replaced by "self" as for any bound method).
So this test verifies that USBTranfer.__mayRaiseUSBError behaves the
intended way.
And to make this test work when there is no USB device around, directly
instanciate USBTransfer and access tested private property.
"""
transfer = usb1.USBTransfer(None, 0, None, None)
transfer._USBTransfer__mayRaiseUSBError(0)
self.assertRaises(usb1.USBErrorIO, transfer._USBTransfer__mayRaiseUSBError, usb1.ERROR_IO)
def getTransfer(iso_packets=0):
# Dummy handle
return usb1.USBTransfer(pointer(libusb1.libusb_device_handle()),
iso_packets, lambda x: None, lambda x: None)