test: Add 'cryptography' 'cachetools' to test deps for bigquery-storage

[Linchin]

Fixes test failures such as https://btx.cloud.google.com/invocations/046f57c8-7637-4cc8-9cf3-02a45fb1b063

It seems to have been caused by the recent changes in auth:
googleapis/google-auth-library-python#1919
googleapis/google-auth-library-python#1590

Example error log:

_ ERROR collecting tests/unit/gapic/bigquery_storage_v1/test_big_query_read.py _
ImportError while importing test module '/tmpfs/src/github/google-cloud-python/packages/google-cloud-bigquery-storage/tests/unit/gapic/bigquery_storage_v1/test_big_query_read.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/local/lib/python3.14/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tests/unit/gapic/bigquery_storage_v1/test_big_query_read.py:42: in 
    from google.api_core import gapic_v1, grpc_helpers, grpc_helpers_async, path_template
.nox/prerelease_deps-protobuf_implementation-python/lib/python3.14/site-packages/google/api_core/gapic_v1/__init__.py:18: in 
    from google.api_core.gapic_v1 import method
.nox/prerelease_deps-protobuf_implementation-python/lib/python3.14/site-packages/google/api_core/gapic_v1/method.py:24: in 
    from google.api_core import grpc_helpers
.nox/prerelease_deps-protobuf_implementation-python/lib/python3.14/site-packages/google/api_core/grpc_helpers.py:23: in 
    import google.auth.transport.grpc
.nox/prerelease_deps-protobuf_implementation-python/lib/python3.14/site-packages/google/auth/transport/grpc.py:23: in 
    from google.oauth2 import service_account
.nox/prerelease_deps-protobuf_implementation-python/lib/python3.14/site-packages/google/oauth2/service_account.py:78: in 
    from google.auth import _service_account_info
.nox/prerelease_deps-protobuf_implementation-python/lib/python3.14/site-packages/google/auth/_service_account_info.py:20: in 
    from google.auth import crypt
.nox/prerelease_deps-protobuf_implementation-python/lib/python3.14/site-packages/google/auth/crypt/__init__.py:41: in 
    from google.auth.crypt import es
.nox/prerelease_deps-protobuf_implementation-python/lib/python3.14/site-packages/google/auth/crypt/es.py:21: in 
    import cryptography.exceptions
E   ModuleNotFoundError: No module named 'cryptography'

[gemini-code-assist]

Summary of Changes

Hello @Linchin, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the stability of the bigquery-storage component's system tests by ensuring that a critical dependency, cryptography, is always available during test runs. By including this package in the test extras, the PR aims to prevent recurring test failures that stem from its absence, thereby improving the reliability of the test suite and preventing future regressions.

Highlights

• Test Dependency Update: The cryptography package has been added to the SYSTEM_TEST_EXTRAS list for the bigquery-storage component's system tests.
• Test Stability Improvement: This change is intended to resolve intermittent system test failures, specifically those related to missing cryptographic functionalities during test execution.

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[gemini-code-assist]

Code Review

The pull request adds 'cryptography' to the SYSTEM_TEST_EXTRAS list in noxfile.py to include it as a dependency for system tests. There are no review comments provided for this change.

[chalmerlowe]

LGTM, sorta.

#QUESTION

The link to a traceback that you shared takes us to a prerelease test.
The install for google-auth is installed as --no-deps, so we are not expecting it to automatically install any of the dependencies for google-auth and thus even though cryptography and cachetools are in the setup.py dependencies section, I wouldn't expect them to be installed. We would need to manage the install manually (which is a key purpose of --no-deps)

What changed so that all of a sudden this test environment changed? It seems that this should have been a problem the whole time.

https://github.com/googleapis/google-auth-library-python/blob/b662fc45829d5892bfc7ee4fdbf9c91e1940d873/setup.py#L22C1-L26C53

[chalmerlowe]

LGTM, see my question in a separate comment.

[Linchin]

LGTM, sorta.

#QUESTION

The link to a traceback that you shared takes us to a prerelease test. The install for google-auth is installed as --no-deps, so we are not expecting it to automatically install any of the dependencies for google-auth and thus even though cryptography and cachetools are in the setup.py dependencies section, I wouldn't expect them to be installed. We would need to manage the install manually (which is a key purpose of --no-deps)

What changed so that all of a sudden this test environment changed? It seems that this should have been a problem the whole time.

https://github.com/googleapis/google-auth-library-python/blob/b662fc45829d5892bfc7ee4fdbf9c91e1940d873/setup.py#L22C1-L26C53

I think the indirect dependencies are installed via this line:

google-cloud-python/packages/google-cloud-bigquery-storage/noxfile.py

Line 505 in d58a9ba

session.install("-e", ".")

So the --no-deps is only for when re-installing the list of dependencies from main branch.