def test_pyusb_device_get_vendor_and_product_ids(self):
"""
Test that the VID and PID supplied with the constructor is returned.
"""
vendor_id = 0xE5F6
product_id = 0x1AB2
interface_number = 0
device = PyUsbDevice(vendor_id, product_id, interface_number)
self.assertEqual(device.get_vendor_id(), vendor_id)
self.assertEqual(device.get_product_id(), product_id)
def test_pyusb_device_get_packet_size_unavailable_if_closed(self):
"""
PyUSB's packet size is only available when the device is connected.
"""
vendor_id = 0
product_id = 0
interface_number = 0
device = PyUsbDevice(vendor_id, product_id, interface_number)
self.assertFalse(device.is_open())
self.assertRaises(DeviceError, device.get_packet_size)
def test_pyusb_device_no_such_device(self):
"""
Operations must fail if there's no such device.
"""
vendor_id = 0
product_id = 0
interface_number = 0
device = PyUsbDevice(vendor_id, product_id, interface_number)
self.assertRaises(IOError, device.open)
self.assertFalse(device.is_open())
self.assertRaises(DeviceError, device.send, "foo")
self.assertRaises(DeviceError, device.receive)
