Moves unittests to root folder and adds github action to run unit tests. (#72)

* Move unit tests to root package.

* Adds deps to "test" extra, and mark two broken tests in tests/unittests/auth/test_auth_handler.py

* Adds github workflow

* minor fix in lite_llm.py for python 3.9.

* format pyproject.toml

tests/unittests/flows/llm_flows/test_other_configs.py

@@ -0,0 +1,46 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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.
+
+from google.adk.agents import Agent
+from google.adk.tools import ToolContext
+from google.genai.types import Part
+from pydantic import BaseModel
+
+from ... import utils
+
+
+def test_output_schema():
+  class CustomOutput(BaseModel):
+    custom_field: str
+
+  response = [
+      'response1',
+  ]
+  mockModel = utils.MockModel.create(responses=response)
+  root_agent = Agent(
+      name='root_agent',
+      model=mockModel,
+      output_schema=CustomOutput,
+      disallow_transfer_to_parent=True,
+      disallow_transfer_to_peers=True,
+  )
+
+  runner = utils.InMemoryRunner(root_agent)
+
+  assert utils.simplify_events(runner.run('test1')) == [
+      ('root_agent', 'response1'),
+  ]
+  assert len(mockModel.requests) == 1
+  assert mockModel.requests[0].config.response_schema == CustomOutput
+  assert mockModel.requests[0].config.response_mime_type == 'application/json'