How to use the metar.Datatypes.UnitsError function in metar

def test_error_checking():
    """Test exception raising."""
    with pytest.raises(ValueError):
        pressure("A2995")
    with pytest.raises(UnitsError):
        pressure("1000", "bars")
    with pytest.raises(UnitsError):
        pressure(pressure("30.00").value, "psi")
    with pytest.raises(UnitsError):
        pressure(pressure("32.00").string, "atm")

def test_error_checking():
    """Test exception raising."""
    with pytest.raises(ValueError):
        speed("10KT")
    with pytest.raises(ValueError):
        speed("10", "MPS", "=")
    with pytest.raises(ValueError):
        speed("60", "KT", "gt")
    with pytest.raises(UnitsError):
        speed("10", "NM")
    with pytest.raises(UnitsError):
        speed(speed("10").value, "furlongs per fortnight")
    with pytest.raises(UnitsError):
        speed(speed("5").string, "fps")

def test_error_checking():
    """Test exception raising."""
    with pytest.raises(ValueError):
        speed("10KT")
    with pytest.raises(ValueError):
        speed("10", "MPS", "=")
    with pytest.raises(ValueError):
        speed("60", "KT", "gt")
    with pytest.raises(UnitsError):
        speed("10", "NM")
    with pytest.raises(UnitsError):
        speed(speed("10").value, "furlongs per fortnight")
    with pytest.raises(UnitsError):
        speed(speed("5").string, "fps")

def test_error_checking():
    """Test exception raising."""
    with pytest.raises(ValueError):
        distance("10SM")
    with pytest.raises(ValueError):
        distance("M1/2SM")
    with pytest.raises(ValueError):
        distance("1000", "M", "=")
    with pytest.raises(ValueError):
        distance("1000", "M", "gt")
    with pytest.raises(UnitsError):
        distance("10", "NM")
    with pytest.raises(UnitsError):
        distance(distance("1000").value, "furlongs")
    with pytest.raises(UnitsError):
        distance(distance("500").string, "yards")

def test_error_checking():
    """Test exception raising."""
    with pytest.raises(ValueError):
        temperature("32C")
    with pytest.raises(ValueError):
        temperature("M10F")
    with pytest.raises(UnitsError):
        temperature("32", "J")
    with pytest.raises(UnitsError):
        temperature(temperature("32").value, "J")
    with pytest.raises(UnitsError):
        temperature(temperature("32").string, "J")

def test_error_checking():
    """Test exception raising."""
    with pytest.raises(ValueError):
        pressure("A2995")
    with pytest.raises(UnitsError):
        pressure("1000", "bars")
    with pytest.raises(UnitsError):
        pressure(pressure("30.00").value, "psi")
    with pytest.raises(UnitsError):
        pressure(pressure("32.00").string, "atm")

def test_error_checking():
    """Test exception raising."""
    with pytest.raises(ValueError):
        temperature("32C")
    with pytest.raises(ValueError):
        temperature("M10F")
    with pytest.raises(UnitsError):
        temperature("32", "J")
    with pytest.raises(UnitsError):
        temperature(temperature("32").value, "J")
    with pytest.raises(UnitsError):
        temperature(temperature("32").string, "J")

def string(self, units=None):
        """Return a string representation of the speed in the given units."""
        if not units:
            units = self._units
        else:
            if units.upper() not in speed.legal_units:
                raise UnitsError("unrecognized speed unit: '" + units + "'")
            units = units.upper()
        val = self.value(units)
        if units == "KMH":
            text = "%.0f km/h" % val
        elif units == "KT":
            text = "%.0f knots" % val
        elif units == "MPH":
            text = "%.0f mph" % val
        elif units == "MPS":
            text = "%.0f mps" % val
        if self._gtlt == ">":
            text = "greater than " + text
        elif self._gtlt == "<":
            text = "less than " + text
        return text

def value(self, units=None):
        """Return the distance in the specified units."""
        if not units:
            return self._value
        else:
            if not units.upper() in distance.legal_units:
                raise UnitsError("unrecognized distance unit: '" + units + "'")
            units = units.upper()
        if units == self._units:
            return self._value
        if self._units == "SM" or self._units == "MI":
            m_value = self._value * 1609.344
        elif self._units == "FT":
            m_value = self._value / 3.28084
        elif self._units == "IN":
            m_value = self._value / 39.3701
        elif self._units == "KM":
            m_value = self._value * 1000
        else:
            m_value = self._value
        if units == "SM" or units == "MI":
            return m_value / 1609.344
        elif units == "FT":

def value(self, units=None):
        """Return the temperature in the specified units."""
        if units is None:
            return self._value
        else:
            if not units.upper() in temperature.legal_units:
                raise UnitsError("unrecognized temperature unit: '" + units + "'")
            units = units.upper()
        if self._units == "C":
            celsius_value = self._value
        elif self._units == "F":
            celsius_value = (self._value - 32.0) / 1.8
        elif self._units == "K":
            celsius_value = self._value - 273.15
        if units == "C":
            return celsius_value
        elif units == "K":
            return 273.15 + celsius_value
        elif units == "F":
            return 32.0 + celsius_value * 1.8