def test_init_device_not_found():
port = 200
address = 0x710
path_name = '/dev/i2c-{}'.format(port)
fake_open = i2c_error(path_name, errno.ENOENT)
with patch('os.open', fake_open):
with pytest.raises(luma.core.error.DeviceNotFoundError) as ex:
i2c(port=port, address=address)
assert str(ex.value) == 'I2C device not found: {}'.format(path_name)
def test_init_device_permission_error():
port = 1
path_name = f'/dev/i2c-{port}'
fake_open = i2c_error(path_name, errno.EACCES)
with patch('os.open', fake_open):
try:
i2c(port=port)
except luma.core.error.DevicePermissionError as ex:
# permission error: device exists but no permission
assert str(ex) == f'I2C device permission denied: {path_name}'
def test_make_serial_i2c():
"""
:py:func:`luma.core.cmdline.make_serial.i2c` returns an I2C instance.
"""
class opts:
i2c_port = 200
i2c_address = 0x710
path_name = '/dev/i2c-{}'.format(opts.i2c_port)
fake_open = i2c_error(path_name, errno.ENOENT)
factory = cmdline.make_serial(opts)
with patch('os.open', fake_open):
with pytest.raises(error.DeviceNotFoundError):
factory.i2c()
def test_make_interface_pcf8574():
"""
:py:func:`luma.core.cmdline.make_interface.pcf8574` returns an pcf8574 instance.
"""
class opts:
i2c_port = 200
i2c_address = 0x710
path_name = f'/dev/i2c-{opts.i2c_port}'
fake_open = i2c_error(path_name, errno.ENOENT)
factory = cmdline.make_interface(opts)
with patch('os.open', fake_open):
with pytest.raises(error.DeviceNotFoundError):
factory.pcf8574()