def test_override_unit(self):
        try:
            VehicleSpeed(42)
        except AttributeError:
            pass
        else:
            self.fail()

        VehicleSpeed(42, override_unit=True)
 def test_unit(self):
     measurement = VehicleSpeed(42, override_unit=True)
     try:
         eq_(measurement.value, 42)
     except AttributeError:
         pass
     else:
         self.fail()
     eq_(measurement.value, measurement.unit(42))
 def test_unit(self):
     measurement = VehicleSpeed(42, override_unit=True)
     try:
         eq_(measurement.value, 42)
     except AttributeError:
         pass
     else:
         self.fail()
     eq_(measurement.value, measurement.unit(42))
    def test_assign_value(self):
        measurement = VehicleSpeed(42, override_unit=True)
        new_value = VehicleSpeed.unit(42)

        try:
            measurement.value = 24
        except AttributeError:
            eq_(measurement.value, new_value)
        else:
            self.fail()

        measurement.value = new_value
        eq_(measurement.value, new_value)
    def test_assign_value(self):
        measurement = VehicleSpeed(42, override_unit=True)
        new_value = VehicleSpeed.unit(42)

        try:
            measurement.value = 24
        except AttributeError:
            eq_(measurement.value, new_value)
        else:
            self.fail()

        measurement.value = new_value
        eq_(measurement.value, new_value)