Checks that if a variable exists for the time series id it has the appropriate attributes

        :param netCDF4.Dataset dataset: An open netCDF dataset

def check_timeseries_id(self, dataset):
        '''
        Checks that if a variable exists for the time series id it has the appropriate attributes

        :param netCDF4.Dataset dataset: An open netCDF dataset
        '''
        results = []
        required_ctx = TestCtx(BaseCheck.HIGH, 'Required variable for time series identifier')
        recommended_ctx = TestCtx(BaseCheck.MEDIUM, 'Recommended attributes for the timeSeries variable')
        # A variable with cf_role="timeseries_id" MUST exist for this to be a valid timeseries incomplete
        timeseries_ids = dataset.get_variables_by_attributes(cf_role='timeseries_id')
        required_ctx.assert_true(timeseries_ids, 'a unique variable must define attribute cf_role="timeseries_id"')
        results.append(required_ctx.to_result())
        if not timeseries_ids:
            return results

        timevar = util.get_time_variable(dataset)
        nc_timevar = dataset.variables[timevar]
        time_dimensions = nc_timevar.dimensions

        timeseries_variable = timeseries_ids[0]
        dims = timeseries_variable.dimensions
        required_ctx.assert_true(
            time_dimensions and time_dimensions[0] == dims[0],
            '{} must have a dimension and that dimension must be shared by the time variable'.format(timeseries_variable.name)
        )
        recommended_ctx.assert_true(
            getattr(timeseries_variable, 'long_name', '') != "",
            "long_name attribute should exist and not be empty"
        )
        results.append(recommended_ctx.to_result())
        return results