add user-defined option in cli integration tests

[mirageoasis]

while working on

#1778

I ran through error that if --pyargs option comes user defined option gets deleted

And I figured out why!

which means we can independently run test using pytest soley!

Link

in this link it states that conftest.py should be located under folder of testpaths which means we have to fix

testpaths option under pyproject.toml
from

testpaths = "tests"
markers = [
    "integration: Test cases that spawn Dockerized kernel sessions",
]
filterwarnings = [
    "ignore::DeprecationWarning:etcd3.*:",
]
asyncio_mode = "auto"

to

testpaths = [
    "tests",
    "src/ai/backend/test"
]
markers = [
    "integration: Test cases that spawn Dockerized kernel sessions",
]
filterwarnings = [
    "ignore::DeprecationWarning:etcd3.*:",
]
asyncio_mode = "auto"

~~

there was confusion on the way! 😢

Link

it says we have to fix pytest.toml to add options in pytest. since it search only root dir in pytest

backend.ai/tests/common/conftest.py

Line 12 in 4762bc8

def pytest_addoption(parser):

this code will not work!

So I suggest test code should be kept together on one directory! for future test!