test: add prerelease session to test with latest dependencies, separate compliance tests

[tswast]

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Towards googleapis/python-bigquery#1021 "Test connectors, such as pandas-gbq and sqlalchemy-bigquery with pre-release, make updates if needed."

Towards #413

Internal CL 422873148 to enable these test sessions in Kokoro.

[tswast]

Prerelease tests pass locally:

(dev-3.9) ➜  python-bigquery-sqlalchemy git:(tswast-prerelease) nox -s prerelease   
nox > Running session prerelease
nox > Creating virtual environment (virtualenv) using python3.8 in .nox/prerelease
nox > python -m pip install --prefer-binary --pre --upgrade google-api-core google-cloud-bigquery google-cloud-bigquery-storage google-cloud-core google-resumable-media grpcio
nox > python -m pip install freezegun google-cloud-testutils mock psutil pytest pytest-cov pytz
nox > python -m pip install sqlalchemy google-auth google-cloud-bigquery google-api-core
nox > python -m pip install --no-deps -e .[all]
nox > python -m pip freeze
attrs==21.4.0
cachetools==4.2.4
certifi==2021.10.8
charset-normalizer==2.0.10
click==8.0.3
coverage==6.2
freezegun==1.1.0
google-api-core==2.4.0
google-auth==2.3.3
google-cloud-bigquery==3.0.0b1
google-cloud-bigquery-storage==2.11.0
google-cloud-core==2.2.2
google-cloud-testutils==1.3.1
google-crc32c==1.3.0
google-resumable-media==2.1.0
googleapis-common-protos==1.54.0
greenlet==1.1.2
grpcio==1.43.0
grpcio-status==1.43.0
idna==3.3
iniconfig==1.1.1
libcst==0.4.0
mock==4.0.3
mypy-extensions==0.4.3
numpy==1.22.1
packaging==21.3
pluggy==1.0.0
proto-plus==1.19.8
protobuf==3.19.3
psutil==5.9.0
py==1.11.0
pyarrow==6.0.1
pyasn1==0.4.8
pyasn1-modules==0.2.8
pyparsing==3.0.6
pytest==6.2.5
pytest-cov==3.0.0
python-dateutil==2.8.2
pytz==2021.3
PyYAML==6.0
requests==2.27.1
rsa==4.8
six==1.16.0
SQLAlchemy==1.4.29
-e git+ssh://git@github.com/tswast/python-bigquery-sqlalchemy.git@129f2747ae820d75a4dd5eafb942a5bdbd32e3d5#egg=sqlalchemy_bigquery
toml==0.10.2
tomli==2.0.0
typing-inspect==0.7.1
typing_extensions==4.0.1
urllib3==1.26.8
nox > py.test --quiet --junitxml=prerelease_unit_3.8_sponge_log.xml tests/unit
======================================================================== test session starts =========================================================================
platform darwin -- Python 3.8.10, pytest-6.2.5, py-1.11.0, pluggy-1.0.0
rootdir: /Users/swast/src/github.com/googleapis/python-bigquery-sqlalchemy, configfile: setup.cfg
plugins: cov-3.0.0
collected 226 items / 1 skipped / 225 selected                                                                                                                       

tests/unit/test__struct.py ....................                                                                                                                [  8%]
tests/unit/test_catalog_functions.py ..........................................                                                                                [ 27%]
tests/unit/test_comments.py .....                                                                                                                              [ 29%]
tests/unit/test_compiler.py .....                                                                                                                              [ 31%]
tests/unit/test_compliance.py ..........                                                                                                                       [ 36%]
tests/unit/test_dialect_types.py .                                                                                                                             [ 36%]
tests/unit/test_engine.py ......                                                                                                                               [ 39%]
tests/unit/test_helpers.py .........                                                                                                                           [ 43%]
tests/unit/test_like_reescape.py .                                                                                                                             [ 43%]
tests/unit/test_parse_url.py ......................................                                                                                            [ 60%]
tests/unit/test_select.py ..................................................s....s...........                                                                  [ 90%]
tests/unit/test_sqlalchemy_bigquery.py .....................                                                                                                   [ 99%]
tests/unit/test_view.py .                                                                                                                                      [100%]

---------------------- generated xml file: /Users/swast/src/github.com/googleapis/python-bigquery-sqlalchemy/prerelease_unit_3.8_sponge_log.xml ----------------------
================================================================== 224 passed, 3 skipped in 14.81s ===================================================================
nox > py.test --quiet --junitxml=prerelease_system_3.8_sponge_log.xml tests/system
======================================================================== test session starts =========================================================================
platform darwin -- Python 3.8.10, pytest-6.2.5, py-1.11.0, pluggy-1.0.0
rootdir: /Users/swast/src/github.com/googleapis/python-bigquery-sqlalchemy, configfile: setup.cfg
plugins: cov-3.0.0
collected 49 items / 2 skipped / 47 selected                                                                                                                         

tests/system/test__struct.py ...                                                                                                                               [  6%]
tests/system/test_helpers.py ssss                                                                                                                              [ 14%]
tests/system/test_sqlalchemy_bigquery.py ..........................................                                                                            [100%]

--------------------- generated xml file: /Users/swast/src/github.com/googleapis/python-bigquery-sqlalchemy/prerelease_system_3.8_sponge_log.xml ---------------------
============================================================= 45 passed, 6 skipped in 284.47s (0:04:44) ==============================================================

Even though we use the latest SQLAlchemy, it is passing since we aren't running against the compliance test suite (yet?).

[tswast]

Note: Mostly taken straight from https://github.com/googleapis/python-bigquery-pandas/blob/d4539747848156446d8a3ccdb49661e72ae03109/noxfile.py#L176

googleapis/synthtool#1290 is open to add this to the templates, though it would need to be slightly templated to allow for customized prerelease dependencies.

[tswast]

FYI: a pytest release in the past month broke the compliance test suite: #413

Edit: Fixed by capping pytest version to less than 7.

[parthea]

LGTM, Added 1 observation

[parthea]

These 4 don't appear in setup.py . Please could you add a comment to clarify the reason that they're included here?

[tswast]

That's a good point. Possibly we should add google-cloud-bigquery-storage to setup.py in a separate PR. It's an "extra" but one that'll raise a warning if not present. The others we get via transitive dependencies. I'll comment.

[tswast]

Mailed #414 which updates some of the dependencies in setup.py to better reflect reality.