def test_base_instrument_errors(self):
b = Instrument('silent', server_name=None)
with self.assertRaises(NotImplementedError):
b.write('hello!')
with self.assertRaises(NotImplementedError):
b.ask('how are you?')
with self.assertRaises(TypeError):
b.add_function('skip',
call_cmd='skip {}',
args=['not a validator'])
with self.assertRaises(NoCommandError):
b.add_function('jump')
with self.assertRaises(NoCommandError):
b.add_parameter('height')
