Improve robustness for resource tests

Turns out that the random interleaver with five processes sometimes does not interleave, so only one port is required (which seems like a bit of a bug in the code, although at the same time not).

b_asic/resources.py

@@ -25,9 +25,7 @@ _T = TypeVar('_T')
 def _sorted_nicely(to_be_sorted: Iterable[_T]) -> List[_T]:
     """Sort the given iterable in the way that humans expect."""
     convert = lambda text: int(text) if text.isdigit() else text
-    alphanum_key = lambda key: [
-        convert(c) for c in re.split('([0-9]+)', str(key))
-    ]
+    alphanum_key = lambda key: [convert(c) for c in re.split('([0-9]+)', str(key))]
     return sorted(to_be_sorted, key=alphanum_key)
 
 
@@ -35,9 +33,7 @@ def draw_exclusion_graph_coloring(
     exclusion_graph: nx.Graph,
     color_dict: Dict[Process, int],
     ax: Optional[Axes] = None,
-    color_list: Optional[
-        Union[List[str], List[Tuple[float, float, float]]]
-    ] = None,
+    color_list: Optional[Union[List[str], List[Tuple[float, float, float]]]] = None,
 ):
     """
     Use matplotlib.pyplot and networkx to draw a colored exclusion graph from the memory assignment
@@ -119,6 +115,13 @@ class ProcessCollection:
         self._schedule_time = schedule_time
         self._cyclic = cyclic
 
+    @property
+    def collection(self):
+        return self._collection
+
+    def __len__(self):
+        return len(self.__collection__)
+
     def add_process(self, process: Process):
         """
         Add a new process to this process collection.
@@ -174,9 +177,7 @@ class ProcessCollection:
 
         # Lifetime chart left and right padding
         PAD_L, PAD_R = 0.05, 0.05
-        max_execution_time = max(
-            process.execution_time for process in self._collection
-        )
+        max_execution_time = max(process.execution_time for process in self._collection)
         if max_execution_time > self._schedule_time:
             # Schedule time needs to be greater than or equal to the maximum process lifetime
             raise KeyError(
@@ -429,9 +430,7 @@ class ProcessCollection:
             read_ports = total_ports if read_ports is None else read_ports
             write_ports = total_ports if write_ports is None else write_ports
         if heuristic == "graph_color":
-            return self._split_ports_graph_color(
-                read_ports, write_ports, total_ports
-            )
+            return self._split_ports_graph_color(read_ports, write_ports, total_ports)
         else:
             raise ValueError("Invalid heuristic provided.")
 
@@ -470,9 +469,7 @@ class ProcessCollection:
         )
 
         # Perform assignment from coloring and return result
-        coloring = nx.coloring.greedy_color(
-            exclusion_graph, strategy=coloring_strategy
-        )
+        coloring = nx.coloring.greedy_color(exclusion_graph, strategy=coloring_strategy)
         return self._split_from_graph_coloring(coloring)
 
     def _split_from_graph_coloring(
@@ -492,15 +489,11 @@ class ProcessCollection:
         -------
         A set of new ProcessCollections.
         """
-        process_collection_set_list = [
-            set() for _ in range(max(coloring.values()) + 1)
-        ]
+        process_collection_set_list = [set() for _ in range(max(coloring.values()) + 1)]
         for process, color in coloring.items():
             process_collection_set_list[color].add(process)
         return {
-            ProcessCollection(
-                process_collection_set, self._schedule_time, self._cyclic
-            )
+            ProcessCollection(process_collection_set, self._schedule_time, self._cyclic)
             for process_collection_set in process_collection_set_list
         }
 
@@ -515,3 +508,9 @@ class ProcessCollection:
         fig.savefig(f, format="svg")
 
         return f.getvalue()
+
+    def __repr__(self):
+        return (
+            f"ProcessCollection({self._collection}, {self._schedule_time},"
+            f" {self._cyclic})"
+        )