Clean up some assertion-checking exception raising.

nemo/generators.py

@@ -184,7 +184,7 @@ def charge_capacity(self, gen, hour):
         except KeyError:
             return gen.capacity
         if result < 0 and isclose(result, 0, abs_tol=1e-6):
-            result = 0
+            result = 0  # pragma: no cover
         if result < 0:
             raise AssertionError
         return result

nemo/polygons.py

@@ -586,7 +586,7 @@ def dist(poly1, poly2):
      (33, 39, 500), (39, 33, 1300), (34, 39, 1000), (39, 34, 1300),
      (39, 38, 2500), (38, 39, 6400), (38, 41, 450), (41, 38, 600)]:
     if p1 not in list(net[p2].keys()):
-        raise ValueError(p2, p1)
+        raise AssertionError(p2, p1)
     if p2 not in list(net[p1].keys()):
-        raise ValueError(p1, p2)
+        raise AssertionError(p1, p2)
     existing_net[p1, p2] = limit

nemo/scenarios.py

@@ -141,8 +141,7 @@ def re100(context):
         elif g in [Biofuel, PV1Axis, CentralReceiver, Wind]:
             result += _every_poly(g)
         else:
-            msg = 'unhandled generator type'
-            raise UnreachableError(msg)
+            raise UnreachableError
     context.generators = result
 
 

nemo/sim.py

@@ -75,8 +75,7 @@ def _store_spills(context, hour, gen, generators, spl):
         if spl < 0 and isclose(spl, 0, abs_tol=1e-6):
             spl = 0
         if spl < 0:
-            msg = 'negative spill'
-            raise RuntimeWarning(msg)
+            raise AssertionError(spl)
 
         # energy stored <= energy transferred, according to store's RTE
         logging.info('STORE: %s -> %s (%.1f)', gen, other, stored)