Add missing Returns and Raises to docstrings

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

benchmarks/timeseries/ringbuffer_serialization.py

@@ -45,6 +45,9 @@ def benchmark_serialization(
     Args:
         ringbuffer: Ringbuffer to benchmark to serialize.
         iterations: amount of iterations to run.
+
+    Returns:
+        Average time to dump and load the ringbuffer.
     """
     total = 0.0
     for _ in range(iterations):

tests/timeseries/mock_microgrid.py

@@ -75,6 +75,9 @@ def __init__(  # pylint: disable=too-many-arguments
                 different namespaces.
             graph: optional, a graph of components to use instead of the default grid
                 layout. If specified, grid_meter must be None.
+
+        Raises:
+            ValueError: if both grid_meter and graph are specified.
         """
         if grid_meter is not None and graph is not None:
             raise ValueError("grid_meter and graph are mutually exclusive")

tests/utils/graph_generator.py

@@ -190,6 +190,9 @@ def _to_graph(
 
         Returns:
             a tuple containing the components and connections of the graph.
+
+        Raises:
+            ValueError: if the input is invalid.
         """
 
         def inverter_type(category: ComponentCategory) -> InverterType | None: