chore: Add check for tests in directory (#1321)

See GoogleCloudPlatform/python-docs-samples#7342 for more info

synthtool/gcp/templates/python_samples/noxfile.py.j2

@@ -184,37 +184,44 @@ PYTEST_COMMON_ARGS = ["--junitxml=sponge_log.xml"]
 def _session_tests(
  session: nox.sessions.Session, post_install: Callable = None
 ) -> None:
- if TEST_CONFIG["pip_version_override"]:
- pip_version = TEST_CONFIG["pip_version_override"]
- session.install(f"pip=={pip_version}")
- """Runs py.test for a particular project."""
- if os.path.exists("requirements.txt"):
- if os.path.exists("constraints.txt"):
- session.install("-r", "requirements.txt", "-c", "constraints.txt")
- else:
- session.install("-r", "requirements.txt")
-
- if os.path.exists("requirements-test.txt"):
- if os.path.exists("constraints-test.txt"):
- session.install("-r", "requirements-test.txt", "-c", "constraints-test.txt")
- else:
- session.install("-r", "requirements-test.txt")
-
- if INSTALL_LIBRARY_FROM_SOURCE:
- session.install("-e", _get_repo_root())
-
- if post_install:
- post_install(session)
-
- session.run(
- "pytest",
- *(PYTEST_COMMON_ARGS + session.posargs),
- # Pytest will return 5 when no tests are collected. This can happen
- # on travis where slow and flaky tests are excluded.
- # See http://doc.pytest.org/en/latest/_modules/_pytest/main.html
- success_codes=[0, 5],
- env=get_pytest_env_vars(),
- )
+ # check for presence of tests
+ test_list = glob.glob("*_test.py") + glob.glob("test_*.py")
+ if len(test_list) == 0:
+ print("No tests found, skipping directory.")
+ else:
+ if TEST_CONFIG["pip_version_override"]:
+ pip_version = TEST_CONFIG["pip_version_override"]
+ session.install(f"pip=={pip_version}")
+ """Runs py.test for a particular project."""
+ if os.path.exists("requirements.txt"):
+ if os.path.exists("constraints.txt"):
+ session.install("-r", "requirements.txt", "-c", "constraints.txt")
+ else:
+ session.install("-r", "requirements.txt")
+
+ if os.path.exists("requirements-test.txt"):
+ if os.path.exists("constraints-test.txt"):
+ session.install(
+ "-r", "requirements-test.txt", "-c", "constraints-test.txt"
+ )
+ else:
+ session.install("-r", "requirements-test.txt")
+
+ if INSTALL_LIBRARY_FROM_SOURCE:
+ session.install("-e", _get_repo_root())
+
+ if post_install:
+ post_install(session)
+
+ session.run(
+ "pytest",
+ *(PYTEST_COMMON_ARGS + session.posargs),
+ # Pytest will return 5 when no tests are collected. This can happen
+ # on travis where slow and flaky tests are excluded.
+ # See http://doc.pytest.org/en/latest/_modules/_pytest/main.html
+ success_codes=[0, 5],
+ env=get_pytest_env_vars(),
+ )
 
 
 @nox.session(python=ALL_VERSIONS)