Support async agent and model callbacks

PiperOrigin-RevId: 755542756

tests/integration/fixture/__init__.py

@@ -11,4 +11,3 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-

tests/integration/fixture/callback_agent/__init__.py

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from . import agent
+from . import agent

tests/integration/models/__init__.py

@@ -11,4 +11,3 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-

tests/integration/test_evalute_agent_in_fixture.py

@@ -19,6 +19,7 @@ import os
 from google.adk.evaluation import AgentEvaluator
 import pytest
 
+
 def agent_eval_artifacts_in_fixture():
   """Get all agents from fixture folder."""
   agent_eval_artifacts = []

tests/integration/tools/__init__.py

@@ -11,4 +11,3 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-