Check if predict_at/day is in .totals

- this is a minor sanity check

setup.cfg

@@ -145,6 +145,8 @@ per-file-ignores =
     src/urban_meal_delivery/forecasts/timify.py:
         # No SQL injection as the inputs come from a safe source.
         S608,
+        # The many noqa's are ok.
+        WPS403,
     tests/*.py:
         # Type annotations are not strictly enforced.
         ANN0, ANN2,

src/urban_meal_delivery/forecasts/decomposition.py

@@ -99,7 +99,7 @@ def stl(  # noqa:C901,WPS210,WPS211,WPS231
     if ns % 2 == 0 or ns < 7:
         raise ValueError('`ns` must be odd and `>= 7`')
 
-    default_nt = math.ceil((1.5 * frequency) / (1 - (1.5 / ns)))  # noqa:WPS432
+    default_nt = math.ceil((1.5 * frequency) / (1 - (1.5 / ns)))
     if nt is not None:
         if nt % 2 == 0 or nt < default_nt:
             raise ValueError(

src/urban_meal_delivery/forecasts/timify.py

@@ -168,7 +168,7 @@ class OrderHistory:
             training time series, frequency, actual order count at `predict_at`
 
         Raises:
-            LookupError: `pixel_id` is not in the `grid`
+            LookupError: `pixel_id` not in `grid` or `predict_at` not in `.totals`
             RuntimeError: desired time series slice is not entirely in `.totals`
         """
         try:
@@ -211,6 +211,8 @@ class OrderHistory:
             raise RuntimeError('Not enough historic data for `predict_at`')
 
         actuals_ts = intra_pixel.loc[[predict_at], 'total_orders']
+        if not len(actuals_ts):  # pragma: no cover
+            raise LookupError('`predict_at` is not in the order history')
 
         return training_ts, frequency, actuals_ts
 
@@ -235,7 +237,7 @@ class OrderHistory:
             training time series, frequency, actual order counts on `predict_day`
 
         Raises:
-            LookupError: `pixel_id` is not in the `grid`
+            LookupError: `pixel_id` not in `grid` or `predict_day` not in `.totals`
             RuntimeError: desired time series slice is not entirely in `.totals`
         """
         try:
@@ -295,6 +297,8 @@ class OrderHistory:
             first_prediction_at:last_prediction_at,  # type: ignore
             'total_orders',
         ]
+        if not len(actuals_ts):  # pragma: no cover
+            raise LookupError('`predict_day` is not in the order history')
 
         return training_ts, frequency, actuals_ts
 
@@ -319,7 +323,7 @@ class OrderHistory:
             training time series, frequency, actual order count at `predict_at`
 
         Raises:
-            LookupError: `pixel_id` is not in the `grid`
+            LookupError: `pixel_id` not in `grid` or `predict_at` not in `.totals`
             RuntimeError: desired time series slice is not entirely in `.totals`
         """
         try:
@@ -386,5 +390,7 @@ class OrderHistory:
             raise RuntimeError('Not enough historic data for `predict_day`')
 
         actuals_ts = intra_pixel.loc[[predict_at], 'total_orders']
+        if not len(actuals_ts):  # pragma: no cover
+            raise LookupError('`predict_at` is not in the order history')
 
         return training_ts, frequency, actuals_ts