for testing purposes

.kokoro/test-samples-impl.sh

@@ -76,7 +76,7 @@ for file in samples/**/requirements.txt; do
     echo "------------------------------------------------------------"
 
     # Use nox to execute the tests for the project.
-    python3.6 -m nox -s "$RUN_TESTS_SESSION"
+    python3.6 -m nox -s "$RUN_TESTS_SESSION" --verbose
     EXIT=$?
 
     # If this is a periodic build, send the test log to the FlakyBot.

samples/snippets/noxfile.py

@@ -103,6 +103,8 @@ def get_pytest_env_vars() -> Dict[str, str]:
 # Error if a python version is missing
 nox.options.error_on_missing_interpreters = True
 
+nox.options.verbose = True
+
 #
 # Style Checks
 #
@@ -195,6 +197,7 @@ def _session_tests(
             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")
@@ -215,6 +218,9 @@ def _session_tests(
         if post_install:
             post_install(session)
 
+        session.install("--upgrade", "protobuf", silent=False)
+        session.install("proto-plus==1.20.1", silent=False)
+
         session.run(
             "pytest",
             *(PYTEST_COMMON_ARGS + session.posargs),