def shp2geojson_test(self):

        input_shp = self.data_input_folder + "London Shapefile/Greater_London_Const_Region.shp"
        output_geojson = self.data_output_folder + "Greater_London_Const_Region"
        shapefile_to_geojson(input_shp, output_geojson)
        output_geojson_suffixed = output_geojson + ".geojson"
        self.assertTrue(os.path.exists(output_geojson_suffixed) == 1, msg="Current working directory is: {0}".format(os.getcwd()) )
        num_lines = sum(1 for line in open(output_geojson_suffixed))
        self.assertTrue(num_lines == 136195)
        self.assertTrue(validate_geojson_from_file(output_geojson_suffixed))
err_stream can be overridden
dataset/ETHPy150Open JamesMilnerUK/Loxo/tests/converisontools_test.py/conversionTest.shp2geojson_test--crossover with--dataset/ETHPy150Open pyinvoke/invoke/tests/runners.py/Runner_.output_stream_overrides.err_can_be_overridden