test: add comprehensive unit, integration, and e2e test suites

Introduce complete test coverage for the ARTEMIS platform across multiple layers:
Unit tests: Add tests for agent nodes (Planner, Operator, Validator, Diagnoser, FlashRunner, Explorer), tools, utils (OCR/XML fusion, UI hierarchy), and data engine.
Integration tests: Add live tool verification, reactive runner, IME, and standalone workflow tests.
E2E tests: Add end-to-end scenario tests for media playback and failure recovery flows.
Fixtures & mocks: Add mock inputs (audio, video, screenshot) and test utilities.

tests/unit/tools/test_long_press_tool.py

@@ -0,0 +1,162 @@
+# Copyright 2026 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 unittest.mock import AsyncMock, MagicMock, patch
+
+from artemis.constants import VALIDATOR_MESSAGES_KEY
+from artemis.context import ArtemisContext
+from artemis.drivers.base import BaseDeviceDriver
+from artemis.graph.state import State
+from artemis.tools.base import ArtemisTool, ToolRegistry
+from artemis.tools.mobile.exec_tools import (
+    LongPress,
+    LongPressArgs,
+    LongPressTool,
+    get_long_press_tool,
+    long_press,
+    long_press_wrapper,
+)
+from langgraph.types import Command
+import pytest
+
+
+@pytest.fixture
+def mock_ctx():
+    ctx = MagicMock(spec=ArtemisContext)
+    ctx.device = MagicMock()
+    ctx.device.device_width = 1080
+    ctx.device.device_height = 2400
+    return ctx
+
+
+@pytest.fixture
+def mock_driver():
+    driver = MagicMock(spec=BaseDeviceDriver)
+    driver.screen_size = (1080, 2400)
+    driver.long_press = AsyncMock(return_value=True)
+    return driver
+
+
+@pytest.fixture
+def mock_state():
+    state = MagicMock(spec=State)
+
+    async def _mock_asanitize_update(ctx, update, agent):
+        return update
+
+    state.asanitize_update = AsyncMock(side_effect=_mock_asanitize_update)
+    return state
+
+
+def test_long_press_tool_subclass_and_registry():
+    """Verify LongPressTool is a subclass of ArtemisTool and properly registered."""
+    assert issubclass(LongPressTool, ArtemisTool)
+    assert issubclass(LongPress, ArtemisTool)
+    assert isinstance(long_press, ArtemisTool)
+    assert isinstance(long_press, LongPressTool)
+
+    assert long_press.name == "long_press"
+    assert long_press.category == "action"
+    assert long_press.args_schema == LongPressArgs
+
+    # Registry lookup
+    reg_tool = ToolRegistry.get("long_press")
+    assert reg_tool is not None
+    assert isinstance(reg_tool, LongPressTool)
+
+    # GenAI FunctionDeclaration export
+    declaration = long_press.to_genai_declaration()
+    assert declaration.name == "long_press"
+    assert "target" in declaration.parameters.properties
+    assert "duration" in declaration.parameters.properties
+
+    # Wrapper check
+    assert long_press_wrapper is not None
+    assert long_press_wrapper.tool_fn_getter == get_long_press_tool
+
+
+@pytest.mark.asyncio
+async def test_long_press_direct_execution_with_driver(mock_driver):
+    """Verify direct execution of LongPressTool with BaseDeviceDriver."""
+    result = await long_press.execute(driver=mock_driver, target=[500, 500], duration=1500)
+    mock_driver.long_press.assert_called_once_with(540, 1200, duration_ms=1500)
+    assert "Long pressed at [500, 500] (normalized) successfully." in result
+
+
+@pytest.mark.asyncio
+async def test_long_press_direct_execution_with_ctx(mock_ctx):
+    """Verify direct execution of LongPressTool with ArtemisContext."""
+    with patch("artemis.tools.mobile.exec_tools.UnifiedMobileController") as mock_controller_cls:
+        mock_controller_inst = MagicMock()
+        mock_controller_inst.tap_at = AsyncMock(return_value=MagicMock(error=None))
+        mock_controller_cls.return_value = mock_controller_inst
+
+        result = await long_press.execute(ctx=mock_ctx, target=[250, 750], duration=2000)
+        mock_controller_inst.tap_at.assert_called_once_with(
+            270, 1800, long_press=True, long_press_duration=2000
+        )
+        assert "Long pressed at [250, 750] (normalized) successfully." in result
+
+
+@pytest.mark.asyncio
+async def test_long_press_with_state_command(mock_ctx, mock_state):
+    """Verify LongPressTool returns Command when state is provided."""
+    with patch("artemis.tools.mobile.exec_tools.UnifiedMobileController") as mock_controller_cls:
+        mock_controller_inst = MagicMock()
+        mock_controller_inst.tap_at = AsyncMock(return_value=MagicMock(error=None))
+        mock_controller_cls.return_value = mock_controller_inst
+
+        cmd = await long_press.execute(
+            ctx=mock_ctx,
+            target=[100, 200],
+            duration=1200,
+            tool_call_id="call_lp_1",
+            state=mock_state,
+        )
+        assert isinstance(cmd, Command)
+        assert VALIDATOR_MESSAGES_KEY in cmd.update
+        messages = cmd.update[VALIDATOR_MESSAGES_KEY]
+        assert len(messages) == 1
+        assert messages[0].tool_call_id == "call_lp_1"
+        assert messages[0].status == "success"
+        assert "Long pressed at [100, 200]" in messages[0].content
+
+
+@pytest.mark.asyncio
+async def test_long_press_callable_execution(mock_driver):
+    """Verify invoking long_press directly as a callable."""
+    result = await long_press(driver=mock_driver, target=[100, 100])
+    assert "Long pressed at [100, 100] (normalized) successfully." in result
+
+
+@pytest.mark.asyncio
+async def test_long_press_invalid_target(mock_ctx):
+    """Verify error handling on invalid target coordinates."""
+    result = await long_press.execute(ctx=mock_ctx, target=[])
+    assert "Error during long press: Invalid target coordinates" in result
+
+
+@pytest.mark.asyncio
+async def test_get_long_press_tool_langchain_ainvoke(mock_ctx):
+    """Verify get_long_press_tool exports a LangChain tool that works with ainvoke."""
+    lp_tool = get_long_press_tool(mock_ctx)
+    assert lp_tool.name == "long_press"
+
+    with patch("artemis.tools.mobile.exec_tools.UnifiedMobileController") as mock_controller_cls:
+        mock_controller_inst = MagicMock()
+        mock_controller_inst.tap_at = AsyncMock(return_value=MagicMock(error=None))
+        mock_controller_cls.return_value = mock_controller_inst
+
+        result = await lp_tool.ainvoke({"target": [500, 500], "duration": 1500})
+        assert "Long pressed at [500, 500] (normalized) successfully." in result