start fixing tests

pvlib/modelchain.py

@@ -1013,8 +1013,7 @@ def complete_irradiance(self, weather):
 
         return self
 
-
-    def _prep_inputs_solar_pos(self, **kwargs):
+    def _prep_inputs_solar_pos(self, kwargs):
         """
         Assign solar position
         """
@@ -1088,7 +1087,6 @@ def _assign_total_irrad(self, data):
         self.total_irrad = data[key_list].copy()
         return self
 
-
     def prepare_inputs(self, weather):
         """
         Prepare the solar position, irradiance, and weather inputs to
@@ -1254,7 +1252,7 @@ def prepare_temperature(self, data=None):
                     "Incomplete irradiance data for cell temperature model."
                     " Provide total_irrad['poa_global'] (preferred) or"
                     " attribute effective_irradiance.")
-        self.cell_temperature = self.temperature_model()
+        self.temperature_model()
         return self
 
     def run_model(self, weather):