pytest and labgrid introduction

.envrc

export LG_ENV=$(pwd)/inventory.yaml

inventory.yaml

---
targets:
  main:
    resources:
      - NetworkService:
          address: raspberry-d.lan
          username: root
    drivers:
      - SSHDriver: {}

pytest.ini

[pytest]
log_cli = true
log_cli_level = INFO

test_example.py

import logging

def test_example():
    logging.info("My first testcase")
    assert True, "must always pass"

test_fixture.py

import pytest

from typing import Iterator
import logging

@pytest.fixture(scope="session")
def myfixt() -> Iterator[int]:
    logging.info("before")
    yield 42
    logging.info("after")

def test_fixture(myfixt):
    assert myfixt == 42

test_labgrid.py

from labgrid.target import Target
from labgrid.driver import SSHDriver
from labgrid.driver.exception import ExecutionError

import pytest

from typing import Iterator
import logging


@pytest.fixture(scope='session')
def shell_cmd(target: Target) -> Iterator[SSHDriver]:
    cmd = target.get_driver('SSHDriver')
    target.activate(cmd)
    yield cmd


def test_uname_system(shell_cmd: SSHDriver):
    result = '\n'.join(shell_cmd.run_check("uname -s"))
    logging.info(result)
    assert 'Linux' == result


def test_command_fails_system(shell_cmd: SSHDriver):
    with pytest.raises(ExecutionError, match='command not found'):
        shell_cmd.run_check("program does not exist and fails therefore")