fix lint and formatting violations in tests and source

tests/test_reconnect.py

@@ -2,7 +2,7 @@
 
 import threading
 
-from tuimble.reconnect import INITIAL_DELAY, MAX_RETRIES, ReconnectManager
+from tuimble.reconnect import INITIAL_DELAY, ReconnectManager
 
 
 def _make_manager(connect_fn=None, **overrides):
@@ -22,7 +22,9 @@ def _make_manager(connect_fn=None, **overrides):
         log["exhausted"] += 1
 
     if connect_fn is None:
-        connect_fn = lambda: None
+
+        def connect_fn():
+            return None
 
     mgr = ReconnectManager(
         connect_fn=connect_fn,
@@ -67,6 +69,7 @@ def test_success_after_failures():
     mgr, log = _make_manager(connect_fn=flaky_connect)
     # Patch delay to zero for test speed
     import tuimble.reconnect as mod
+
     orig = mod.INITIAL_DELAY
     mod.INITIAL_DELAY = 0
     try:
@@ -88,7 +91,10 @@ def test_non_retryable_aborts_immediately():
     class Rejected(Exception):
         retryable = False
 
-    mgr, log = _make_manager(connect_fn=lambda: (_ for _ in ()).throw(Rejected("banned")))
+    def _raise():
+        raise Rejected("banned")
+
+    mgr, log = _make_manager(connect_fn=_raise)
     mgr.run()
     assert log["exhausted"] == 1
     assert log["success"] == 0
@@ -102,6 +108,7 @@ def test_non_retryable_aborts_immediately():
 def test_exhaustion_after_max_retries():
     """Loop stops after MAX_RETRIES failed attempts."""
     import tuimble.reconnect as mod
+
     orig_delay = mod.INITIAL_DELAY
     orig_retries = mod.MAX_RETRIES
     mod.INITIAL_DELAY = 0
@@ -155,6 +162,7 @@ def test_backoff_delays():
     # We only need the attempt callback to record delays; cancel after
     # a few attempts to avoid waiting.
     import tuimble.reconnect as mod
+
     orig_delay = mod.INITIAL_DELAY
     orig_retries = mod.MAX_RETRIES
     mod.INITIAL_DELAY = 0  # zero delay for speed