[core] Enable ruff B (flake8-bugbear) lint family (#16655)

tests/component_tests/display/test_display_metadata.py

@@ -2,6 +2,8 @@
 
 from unittest.mock import patch
 
+import pytest
+
 from esphome.components.display import (
     DisplayMetaData,
     add_metadata,
@@ -74,8 +76,5 @@ def test_add_metadata_overwrites_existing():
 def test_metadata_is_frozen():
     """Test that DisplayMetaData instances are immutable (frozen dataclass)."""
     meta = DisplayMetaData(320, 240, True, False)
-    try:
+    with pytest.raises(AttributeError):
         meta.width = 640
-        assert False, "Expected FrozenInstanceError"
-    except AttributeError:
-        pass

tests/component_tests/packages/test_packages.py

@@ -510,15 +510,9 @@ def test_package_merge_by_missing_id() -> None:
         ],
     }
 
-    error_raised = False
-    try:
+    with pytest.raises(cv.Invalid) as exc_info:
         packages_pass(config)
-        assert False, "Expected validation error for missing ID"
-    except cv.Invalid as err:
-        error_raised = True
-        assert err.path == [CONF_SENSOR, 2]
-
-    assert error_raised
+    assert exc_info.value.path == [CONF_SENSOR, 2]
 
 
 def test_package_list_remove_by_id() -> None:

tests/integration/conftest.py

@@ -407,8 +407,10 @@ async def wait_and_connect_api_client(
         # Wait for connection with timeout
         try:
             await asyncio.wait_for(connected_future, timeout=timeout)
-        except TimeoutError:
-            raise TimeoutError(f"Failed to connect to API after {timeout} seconds")
+        except TimeoutError as err:
+            raise TimeoutError(
+                f"Failed to connect to API after {timeout} seconds"
+            ) from err
 
         if return_disconnect_event:
             yield client, disconnect_event

tests/unit_tests/test_config_normalization.py

@@ -67,7 +67,7 @@ def test_iter_component_configs_with_multi_conf(mock_get_component: Mock) -> Non
     configs = list(config.iter_component_configs(test_config))
     assert len(configs) == 2
 
-    for domain, component, conf in configs:
+    for domain, _component, conf in configs:
         assert domain == "switch"
         assert "name" in conf