fix(tests): use mock GCS client in artifact service tests to avoid real credentials

Copybara import of the project:

--
ade1d98e030a966183f56cb5c9c1b04cf51f5337 by Thiago Neves <thiagohneves@gmail.com>:

fix(tests): use mock GCS client in artifact service tests to avoid real credentials

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becd2925feebf60196129b029a0ab8d490f7b19e by Thiago Neves <thiagohneves@gmail.com>:

test(agents): add unit tests for live_request_queue, readonly_context, and run_config

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/641 from thiagoneves:feature/increase-test-coverage 0f7a9fc55d97902e190a394f099324fbeb1541af
PiperOrigin-RevId: 756798390

tests/unittests/agents/test_live_request_queue.py

@@ -0,0 +1,52 @@
+import pytest
+from unittest.mock import MagicMock, AsyncMock, patch
+from google.adk.agents.live_request_queue import LiveRequest, LiveRequestQueue
+from google.genai import types
+
+
+@pytest.mark.asyncio
+async def test_close_queue():
+  queue = LiveRequestQueue()
+
+  with patch.object(queue._queue, "put_nowait") as mock_put_nowait:
+    queue.close()
+    mock_put_nowait.assert_called_once_with(LiveRequest(close=True))
+
+
+def test_send_content():
+  queue = LiveRequestQueue()
+  content = MagicMock(spec=types.Content)
+
+  with patch.object(queue._queue, "put_nowait") as mock_put_nowait:
+    queue.send_content(content)
+    mock_put_nowait.assert_called_once_with(LiveRequest(content=content))
+
+
+def test_send_realtime():
+  queue = LiveRequestQueue()
+  blob = MagicMock(spec=types.Blob)
+
+  with patch.object(queue._queue, "put_nowait") as mock_put_nowait:
+    queue.send_realtime(blob)
+    mock_put_nowait.assert_called_once_with(LiveRequest(blob=blob))
+
+
+def test_send():
+  queue = LiveRequestQueue()
+  req = LiveRequest(content=MagicMock(spec=types.Content))
+
+  with patch.object(queue._queue, "put_nowait") as mock_put_nowait:
+    queue.send(req)
+    mock_put_nowait.assert_called_once_with(req)
+
+
+@pytest.mark.asyncio
+async def test_get():
+  queue = LiveRequestQueue()
+  res = MagicMock(spec=types.Content)
+
+  with patch.object(queue._queue, "get", return_value=res) as mock_get:
+    result = await queue.get()
+
+    assert result == res
+    mock_get.assert_called_once()