twister: Add robot framework integration

This change adds an entrypoint for the common robot framework and a
first library to interact with the board, similar to the functionality
currently available in pytest.

To reuse the command line parsing and have a proper twister config, we
provide a robot_wrapper which serializes the configuration and reloads
it in the library.

This change addresses zephyrproject-rtos#64825, which asks for robot scripts without
renode.

Signed-off-by: Stefan Kraus <[email protected]>

scripts/pylib/pytest-twister-harness/src/twister_harness/robot_framework/ZephyrLibrary.py

@@ -0,0 +1,57 @@
+import pickle
+
+from robot.libraries.BuiltIn import BuiltIn
+from twister_harness import DeviceAdapter, Shell
+from twister_harness.device.factory import DeviceFactory
+from twister_harness.twister_harness_config import TwisterHarnessConfig
+
+
+class ZephyrLibrary:
+    ROBOT_LIBRARY_SCOPE = "SUITE"
+
+    def __init__(self):
+        self.device: DeviceAdapter | None = None
+        self.shell: Shell | None = None
+
+        self.twister_harness_config = self._get_twister_harness_config()
+
+    def _get_twister_harness_config(self) -> TwisterHarnessConfig:
+        all_variables = BuiltIn().get_variables()
+        twister_harness_config_file = all_variables.get(
+            "${TWISTER_HARNESS_CONFIG_FILE}", None
+        )
+        if twister_harness_config_file is None:
+            raise ValueError(
+                "TWISTER_HARNESS_CONFIG_FILE variable must be set to file with pickle"
+            )
+
+        with open(twister_harness_config_file, "rb") as twister_harness_file:
+            return pickle.load(twister_harness_file)
+
+    def get_a_device(self):
+        device_object = DeviceFactory.get_device_object(self.twister_harness_config)
+        self.device = device_object
+        return device_object
+
+    def run_device(self):
+        if self.device is None:
+            raise ValueError("Currently no device")
+
+        self.device.launch()
+
+    def run_command(self, command: str) -> list[str]:
+        if self.device is None:
+            raise ValueError("Currently no device")
+
+        if self.shell is None:
+            self.shell = Shell(self.device)
+            assert self.shell.wait_for_prompt()
+
+        return self.shell.exec_command(command)
+
+    def close_device(self):
+        if self.device is None:
+            raise ValueError("Currently no device")
+
+        self.device.close()
+        self.device = None

scripts/pylib/pytest-twister-harness/src/twister_harness/robot_framework/robot_wrapper.py

@@ -0,0 +1,46 @@
+import argparse
+import pickle
+
+import robot
+from twister_harness.argument_handler import ArgumentHandler
+from twister_harness.twister_harness_config import TwisterHarnessConfig
+
+ROBOT_TWISTER_VAR_FILE = "robot_twister_var.pickle"
+
+
+def _parse_arguments():
+    parser = argparse.ArgumentParser()
+
+    handler = ArgumentHandler(parser.add_argument)
+    handler.add_common_arguments()
+
+    options, rest_args = parser.parse_known_args()
+
+    handler.sanitize_options(options)
+
+    return options, rest_args
+
+
+def _serialize_config(twister_harness_config: TwisterHarnessConfig):
+    device = twister_harness_config.devices[0]
+
+    filepath = device.build_dir / ROBOT_TWISTER_VAR_FILE
+
+    with open(device.build_dir / ROBOT_TWISTER_VAR_FILE, "wb") as robot_twister_vars:
+        pickle.dump(twister_harness_config, robot_twister_vars)
+
+    return filepath
+
+
+def main():
+    options, rest_args = _parse_arguments()
+    twister_harness_config = TwisterHarnessConfig.create(options)
+    variables_filepath = _serialize_config(twister_harness_config)
+
+    robot.run_cli(
+        ["--variable", f"TWISTER_HARNESS_CONFIG_FILE:{variables_filepath}"] + rest_args
+    )
+
+
+if __name__ == "__main__":
+    main()

scripts/pylib/pytest-twister-harness/tests/robot_framework/device_test.robot

@@ -0,0 +1,11 @@
+*** Settings ***
+Documentation    Robot testfile to check for existence of commands.
+Library          twister_harness.robot_framework.ZephyrLibrary
+
+*** Test Cases ***
+Command workflow test
+   [Documentation]    Test that all commands exist.
+   Get a Device
+   Run Device
+   Run Command        echo 'my device'
+   Close Device

scripts/pylib/pytest-twister-harness/tests/robot_framework/robot_wrapper_test.py

@@ -0,0 +1,41 @@
+import pathlib
+import sys
+from unittest.mock import patch
+
+import pytest
+from twister_harness.robot_framework import robot_wrapper
+
+
+def test__integration__dry_run_robotfile__no_errors():
+    robot_file = pathlib.Path(__file__).parent / "device_test.robot"
+    cli_arguments = [
+        "twister_harness.robot_framework.robot_wrapper",
+        "--quiet",
+        "--dryrun",
+        "--build-dir",
+        ".",
+        "--device-type=custom",
+        str(robot_file),
+    ]
+    with patch.object(sys, "argv", cli_arguments):
+        with pytest.raises(SystemExit) as excinfo:
+            robot_wrapper.main()
+
+        assert excinfo.value.code == 0
+
+
+def test__integration__missing_parameter__raises_nonzero_systemexit():
+    robot_file = pathlib.Path(__file__).parent / "device_test.robot"
+    cli_arguments = [
+        "twister_harness.robot_framework.robot_wrapper",
+        "--quiet",
+        "--dryrun",
+        "--build-dir",
+        ".",
+        "--device-type=custom",
+    ]
+    with patch.object(sys, "argv", cli_arguments):
+        with pytest.raises(SystemExit) as excinfo:
+            robot_wrapper.main()
+
+        assert excinfo.value.code != 0

scripts/pylib/pytest-twister-harness/tests/robot_framework/zephyr_library_test.py

@@ -0,0 +1,54 @@
+import pathlib
+from unittest.mock import patch
+
+import pytest
+from twister_harness import DeviceAdapter
+from twister_harness.device.binary_adapter import NativeSimulatorAdapter
+from twister_harness.robot_framework.ZephyrLibrary import ZephyrLibrary
+from twister_harness.twister_harness_config import DeviceConfig, TwisterHarnessConfig
+
+
+@pytest.fixture
+def twister_harness_config(tmp_path):
+    device_config = DeviceConfig(type="custom", build_dir=tmp_path)
+    twister_harness_config = TwisterHarnessConfig()
+    twister_harness_config.devices = [device_config]
+    yield twister_harness_config
+
+
+@pytest.fixture
+def zephyr_library(twister_harness_config):
+    with patch.object(
+        ZephyrLibrary,
+        "_get_twister_harness_config",
+        return_value=twister_harness_config,
+    ):
+        yield ZephyrLibrary()
+
+
+def test__init__correctly_initialized(zephyr_library, twister_harness_config):
+    assert zephyr_library.device is None
+    assert zephyr_library.shell is None
+    assert zephyr_library is not None
+
+    assert zephyr_library.twister_harness_config == twister_harness_config
+
+
+def test__run_device__correctly_setup(
+    zephyr_library, shell_simulator_adapter: NativeSimulatorAdapter
+):
+    zephyr_library.device = shell_simulator_adapter
+
+    zephyr_library.run_device()
+
+
+def test__run_command__can_execute_commands(
+    zephyr_library, shell_simulator_adapter: NativeSimulatorAdapter
+):
+    zephyr_library.device = shell_simulator_adapter
+
+    zephyr_library.run_device()
+    result = zephyr_library.run_command("zen")
+
+    assert result is not None
+    assert isinstance(result, list)