chore(py_library): add split_system_tests

Source-Author: Takashi Matsuo <tmatsuo@google.com>
Source-Date: Fri Jul 31 16:17:13 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: bfcdbe0da977b2de6c1c0471bb6dc2f1e13bf669
Source-Link: googleapis/synthtool@bfcdbe0

.kokoro/build.sh

@@ -36,4 +36,10 @@ python3.6 -m pip uninstall --yes --quiet nox-automation
 python3.6 -m pip install --upgrade --quiet nox
 python3.6 -m nox --version
 
-python3.6 -m nox
+# If NOX_SESSION is set, it only runs the specified session,
+# otherwise run all the sessions.
+if [[ -n "${NOX_SESSION:-}" ]]; then
+    python3.6 -m nox -s "${NOX_SESSION:-}"
+else
+    python3.6 -m nox
+fi

noxfile.py

@@ -100,6 +100,10 @@ def system(session):
     """Run the system test suite."""
     system_test_path = os.path.join("tests", "system.py")
     system_test_folder_path = os.path.join("tests", "system")
+
+    # Check the value of `RUN_SYSTEM_TESTS` env var. It defaults to true.
+    if os.environ.get("RUN_SYSTEM_TESTS", "true") == "false":
+        session.skip("RUN_SYSTEM_TESTS is set to false, skipping")
     # Sanity check: Only run tests if the environment variable is set.
     if not os.environ.get("GOOGLE_APPLICATION_CREDENTIALS", ""):
         session.skip("Credentials must be set via environment variable")

synth.metadata

@@ -19,14 +19,14 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "39b527a39f5cd56d4882b3874fc08eed4756cebe"
+        "sha": "bfcdbe0da977b2de6c1c0471bb6dc2f1e13bf669"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "39b527a39f5cd56d4882b3874fc08eed4756cebe"
+        "sha": "bfcdbe0da977b2de6c1c0471bb6dc2f1e13bf669"
       }
     }
   ],