fix(typing): add missing annotations and typing.cast to event.py and platform tests

Author: marcusmotill

src/google/adk/events/event.py

@@ -15,6 +15,8 @@
 from __future__ import annotations
 
 from typing import Optional
+from typing import Any
+from typing import cast
 
 from google.adk.platform import time as platform_time
 from google.adk.platform import uuid as platform_uuid
@@ -73,7 +75,7 @@ class Event(LlmResponse):
   timestamp: float = Field(default_factory=lambda: platform_time.get_time())
   """The timestamp of the event."""
 
-  def model_post_init(self, __context):
+  def model_post_init(self, __context: Any) -> None:
     """Post initialization logic for the event."""
     # Generates a random ID for the event.
     if not self.id:
@@ -124,5 +126,5 @@ def has_trailing_code_execution_result(
     return False
 
   @staticmethod
-  def new_id():
-    return platform_uuid.new_uuid()
+  def new_id() -> str:
+    return cast(str, platform_uuid.new_uuid())

tests/unittests/platform/test_time.py

@@ -22,18 +22,18 @@
 
 class TestTime(unittest.TestCase):
 
-  def tearDown(self):
+  def tearDown(self) -> None:
     # Reset provider to default after each test
     platform_time.reset_time_provider()
 
-  def test_default_time_provider(self):
+  def test_default_time_provider(self) -> None:
     # Verify it returns a float that is close to now
     now = time.time()
     rt_time = platform_time.get_time()
     self.assertIsInstance(rt_time, float)
     self.assertAlmostEqual(rt_time, now, delta=1.0)
 
-  def test_custom_time_provider(self):
+  def test_custom_time_provider(self) -> None:
     # Test override
     mock_time = 123456789.0
     platform_time.set_time_provider(lambda: mock_time)

tests/unittests/platform/test_uuid.py

@@ -22,18 +22,18 @@
 
 class TestUUID(unittest.TestCase):
 
-  def tearDown(self):
+  def tearDown(self) -> None:
     # Reset provider to default after each test
     platform_uuid.reset_id_provider()
 
-  def test_default_id_provider(self):
+  def test_default_id_provider(self) -> None:
     # Verify it returns a string uuid
     uid = platform_uuid.new_uuid()
     self.assertIsInstance(uid, str)
     # Should be parseable as uuid
     uuid.UUID(uid)
 
-  def test_custom_id_provider(self):
+  def test_custom_id_provider(self) -> None:
     # Test override
     mock_id = "test-id-123"
     platform_uuid.set_id_provider(lambda: mock_id)