chore: fix unit test

Signed-off-by: Manish Dait <[email protected]>

Author: manishdait

src/hiero_sdk_python/client/network.py

@@ -118,10 +118,13 @@ def __init__(
         self._node_max_readmit_period = 3600  # seconds
         self._earliest_readmit_time = time.monotonic() + self._node_min_readmit_period
 
+        if not self._healthy_nodes:
+            raise ValueError("No healthy nodes available to initialize network")
+
         self._node_index: int = secrets.randbelow(len(self._healthy_nodes))
         self.current_node: _Node = self._healthy_nodes[self._node_index]
 
-    def _set_network_nodes(self, nodes: Optional[List[_Node]]):
+    def _set_network_nodes(self, nodes: Optional[List[_Node]] = None):
         """
         Configure the consensus nodes used by this network.
         """
@@ -148,8 +151,7 @@ def _set_network_nodes(self, nodes: Optional[List[_Node]]):
             self._healthy_nodes.append(node)
 
     def _resolve_nodes(self, nodes: Optional[List[_Node]]) -> List[_Node]:
-        if nodes is not None:
-            return nodes
+        if nodes: return nodes
 
         if self.network in ("solo", "localhost", "local"):
             return self._fetch_nodes_from_default_nodes()

tests/unit/executable_test.py

@@ -1014,7 +1014,7 @@ def fake_time():
         mock_hedera_servers(response_sequences) as client,
         patch("hiero_sdk_python.executable.time.sleep"),
         patch(
-            "hiero_sdk_python.executable.time.time", side_effect=lambda: next(time_iter)
+            "hiero_sdk_python.executable.time.monotonic", side_effect=lambda: next(time_iter)
         ),
         patch("hiero_sdk_python.node._Node.is_healthy", return_value=True),
         patch(