chore: refine prerelease_deps to conditionally run system tests

Author: chalmerlowe

packages/google-cloud-spanner/noxfile.py

@@ -37,7 +37,7 @@
 DEFAULT_PYTHON_VERSION = "3.14"
 
 DEFAULT_MOCK_SERVER_TESTS_PYTHON_VERSION = "3.12"
-SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.14"]
+SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ["3.12"]
 
 UNIT_TEST_PYTHON_VERSIONS: List[str] = [
     "3.9",
@@ -656,6 +656,7 @@ def prerelease_deps(session, protobuf_implementation, database_dialect):
     system_test_path = os.path.join("tests", "system.py")
     system_test_folder_path = os.path.join("tests", "system")
 
+<<<<<<< HEAD
     if os.environ.get("SPANNER_EMULATOR_HOST"):
         # Run tests against the emulator
         run_system = True
@@ -710,6 +711,41 @@ def prerelease_deps(session, protobuf_implementation, database_dialect):
 
 =======
 >>>>>>> d4bff6eaee2 (chore: improves logic within prerelease_deps session)
+=======
+    # Only run system tests for one protobuf implementation on real Spanner to speed up the build.
+    if os.environ.get("SPANNER_EMULATOR_HOST") or protobuf_implementation == "python":
+        # Sanity check: Only run system tests if credentials or emulator are set.
+        if os.environ.get("GOOGLE_APPLICATION_CREDENTIALS") or os.environ.get("SPANNER_EMULATOR_HOST"):
+            # Only run system tests if found.
+            if os.path.exists(system_test_path):
+                session.run(
+                    "py.test",
+                    "--verbose",
+                    f"--junitxml=system_{session.python}_sponge_log.xml",
+                    system_test_path,
+                    *session.posargs,
+                    env={
+                        "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+                        "SPANNER_DATABASE_DIALECT": database_dialect,
+                        "SKIP_BACKUP_TESTS": "true",
+                    },
+                )
+            elif os.path.exists(system_test_folder_path):
+                session.run(
+                    "py.test",
+                    "--verbose",
+                    f"--junitxml=system_{session.python}_sponge_log.xml",
+                    system_test_folder_path,
+                    *session.posargs,
+                    env={
+                        "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
+                        "SPANNER_DATABASE_DIALECT": database_dialect,
+                        "SKIP_BACKUP_TESTS": "true",
+                    },
+                )
+        else:
+            session.log("Skipping system tests because credentials/emulator are missing")
+>>>>>>> 3cda3a846be (chore: refine prerelease_deps to conditionally run system tests)
 
 @nox.session(python=DEFAULT_PYTHON_VERSION)
 def mypy(session):