small changes

pytket/phir/sharding/sharder.py

@@ -51,7 +51,7 @@ def _process_command(self, command: Command) -> None:
             msg = f"OpType {command.op.type} not supported!"
             raise NotImplementedError(msg)
 
-        if self._is_op_schedulable(command.op):
+        if self.is_op_schedulable(command.op):
             print(f"Scheduling command: {command}")
             self._build_shard(command)
         else:
@@ -79,7 +79,7 @@ def _add_pending_command(self, command: Command) -> None:
         self._pending_commands[command.args[0]].append(command)
 
     @staticmethod
-    def _is_op_schedulable(op: Op) -> bool:
+    def is_op_schedulable(op: Op) -> bool:
         """
         Returns `True` if the operation is one that should be scheduled, that is,
         that will have a shard created for it. This includes non-gate operations

tests/test_sharder.py

@@ -21,4 +21,4 @@ def test_ctor(self) -> None:
 
         output = sharder.shard()
 
-        assert len(output) == 2  # noqa: PLR2004
+        assert len(output) == 3  # noqa: PLR2004