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# Source code for safe.engine.impact_functions_for_testing.error_raising_functions

    from safe.impact_functions.core import FunctionProvider

    # TODO (MB) Write a test that calls this function and expects this to be in the
    # results box
    #Error:
    #An exception occurred when calculating the results
    #Problem:
    #Exception : AHAHAH I got you
    #Click for Diagnostic Information:

    class ExceptionRaisingImpactFunction(FunctionProvider):
        """Risk plugin for error Rising

        :param requires category=='hazard'
                        layertype=='raster'

        :param requires category=='exposure' and \
                        layertype=='raster'
        """

        title = 'Exception riser'

        @staticmethod
        def run(layers):
            """Risk plugin for tephra impact
            """
            del layers
            raise Exception('AHAHAH I got you')

    # TODO (MB) Write a test that calls this function and expects this to be in the
    # results box
    #Error:
    #An exception occurred when calculating the results
    #Problem:
    #AttributeError : 'NoneType' object has no attribute 'keywords'
    #Click for Diagnostic Information:

    class NoneReturningImpactFunction(FunctionProvider):
        """Risk plugin for error Rising

        :param requires category=='hazard'
                        layertype=='raster'

        :param requires category=='exposure' and \
                        layertype=='raster'
        """

        title = 'None returner'

        @staticmethod
        def run(layers):
            """Risk plugin for tephra impact
            """
            del layers

            return None

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