feat: migrating off of circle/ci (googleapis#638)

* saving state of noxfile prior to owlbot.py edits

* minor clean up of leftover artifacts from various experiments

* linting and black

* adds noxfile.py to excludes and removes noxfile edits in owlbot

* Adds new kokoro file in presubmit

* removes circle/ci config file

* Update noxfile.py

* Update noxfile.py

* Update noxfile.py

* remove limit on printing only KOKORO env variables (for testing)

* updates build.sh with conda environmental variables

* updates build.sh with conda environmental variables redux

* removes the ci folder and files related to circle ci

* updates env variable to display all vars not just KOKORO

* removes additional content related to circle ci

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* updates owlbot with build.sh edits

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* updates owlbot with build.sh minor tweak

* revert build.sh

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* testing regex change

* revert build.sh

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: chalmerlowe

.circleci/config.yml

@@ -23,9 +23,18 @@ cd "${PROJECT_ROOT}"
 
 # Disable buffering, so that the logs stream through.
 export PYTHONUNBUFFERED=1
+export CONDA_EXE=/root/conda/bin/conda
+export CONDA_PREFIX=/root/conda
+export CONDA_PROMPT_MODIFIER=(base) 
+export _CE_CONDA=
+export CONDA_SHLVL=1
+export CONDA_PYTHON_EXE=/root/conda/bin/python
+export CONDA_DEFAULT_ENV=base
+export PATH=/root/conda/bin:/root/conda/condabin:${PATH}
+
 
 # Debug: show build environment
-env | grep KOKORO
+env
 
 # Setup service account credentials.
 export GOOGLE_APPLICATION_CREDENTIALS=${KOKORO_GFILE_DIR}/service-account.json

.kokoro/build.sh

@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Only run this nox session.
+env_vars: {
+    key: "NOX_SESSION"
+    value: "conda_test"
+}

.kokoro/presubmit/conda_test.cfg

@@ -31,6 +31,7 @@
 
 DEFAULT_PYTHON_VERSION = "3.8"
 
+
 UNIT_TEST_PYTHON_VERSIONS = ["3.7", "3.8", "3.9", "3.10", "3.11"]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
     "mock",
@@ -51,6 +52,11 @@
     "3.9": [],
 }
 
+CONDA_TEST_PYTHON_VERSIONS = [
+    UNIT_TEST_PYTHON_VERSIONS[0],
+    UNIT_TEST_PYTHON_VERSIONS[-1],
+]
+
 SYSTEM_TEST_PYTHON_VERSIONS = ["3.7", "3.8", "3.9", "3.10", "3.11"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
@@ -514,3 +520,78 @@ def prerelease_deps(session):
             system_test_folder_path,
             *session.posargs,
         )
+
+
+def install_conda_unittest_dependencies(session, standard_deps, conda_forge_packages):
+    """Installs packages from conda forge, pypi, and locally."""
+
+    # Install from conda-forge and default conda package repos.
+    session.conda_install(*conda_forge_packages, channel=["defaults", "conda-forge"])
+
+    # Install from pypi for packages not readily available on conda forge.
+    session.install(
+        *standard_deps,
+    )
+
+    # Install via pip from the local repo, avoid doing dependency resolution
+    # via pip, so that we don't override any conda resolved dependencies
+    session.install("-e", ".", "--no-deps")
+
+
+@nox.session(python=CONDA_TEST_PYTHON_VERSIONS, venv_backend="mamba")
+def conda_test(session):
+    """Run test suite in a conda virtual environment.
+
+    Installs all test dependencies, then installs this package.
+    NOTE: Some of these libraries are not readily available on conda-forge
+    at this time and are thus installed using pip after the base install of
+    libraries from conda-forge.
+
+    We decided that it was more important to prove a base ability to install
+    using conda than to complicate things with adding a whole nother
+    set of constraints just for a conda install, so this install does not
+    attempt to constrain packages (i.e. in a constraints-x.x.txt file)
+    manually.
+    """
+
+    standard_deps = (
+        UNIT_TEST_STANDARD_DEPENDENCIES
+        + UNIT_TEST_DEPENDENCIES
+        + UNIT_TEST_EXTERNAL_DEPENDENCIES
+    )
+
+    conda_forge_packages = [
+        "db-dtypes",
+        "google-api-core",
+        "google-auth",
+        "google-auth-oauthlib",
+        "google-cloud-bigquery",
+        "google-cloud-bigquery-storage",
+        "numpy",
+        "pandas",
+        "pyarrow",
+        "pydata-google-auth",
+        "tqdm",
+        "protobuf",
+    ]
+
+    install_conda_unittest_dependencies(session, standard_deps, conda_forge_packages)
+
+    # Provide a list of all installed packages (both from conda forge and pip)
+    # for troubleshooting purposes.
+    session.run("mamba", "list")
+
+    # Tests are limited to unit tests only, at this time.
+    session.run(
+        "py.test",
+        "--quiet",
+        f"--junitxml=unit_{session.python}_sponge_log.xml",
+        "--cov=pandas_gbq",
+        "--cov=tests/unit",
+        "--cov-append",
+        "--cov-config=.coveragerc",
+        "--cov-report=",
+        "--cov-fail-under=0",
+        os.path.join("tests", "unit"),
+        *session.posargs,
+    )