chore: only run 2.7 tests for GAE (GoogleCloudPlatform#3116)

This runs 2.7 tests only for GAE Standard samples.

The second commit intentionally touched files in every directory to trigger CI. The real changes to the noxfiles and kokoro are in the [first commit](GoogleCloudPlatform@15e30db). I will revert the spurious License header commit before merging. :)

Author: busunkim96

.kokoro/python2.7/common.cfg

@@ -41,5 +41,5 @@ action {
 # Specify which tests to run
 env_vars: {
     key: "RUN_TESTS_SESSION"
-    value: "py2"
+    value: "gae"
 }

noxfile-template.py

@@ -139,28 +139,9 @@ def _setup_appengine_sdk(session):
         "appengine/standard/"
     )
 ]
-PY3_ONLY_SAMPLES = [
-    sample
-    for sample in ALL_TESTED_SAMPLES
-    if (
-        str(Path(sample).absolute().relative_to(REPO_ROOT)).startswith(
-            "appengine/standard_python37"
-        )
-        or str(Path(sample).absolute().relative_to(REPO_ROOT)).startswith(
-            "appengine/flexible/django_cloudsql"
-        )
-        or str(Path(sample).absolute().relative_to(REPO_ROOT)).startswith("functions/")
-        or str(Path(sample).absolute().relative_to(REPO_ROOT)).startswith(
-            "bigquery/pandas-gbq-migration"
-        )
-        or str(Path(sample).absolute().relative_to(REPO_ROOT)).startswith(
-            "run/"
-        )
-    )
-]
-NON_GAE_STANDARD_SAMPLES_PY2 = sorted(
-    list((set(ALL_TESTED_SAMPLES) - set(GAE_STANDARD_SAMPLES)) - set(PY3_ONLY_SAMPLES))
-)
+
+PY2_ONLY_SAMPLES = GAE_STANDARD_SAMPLES
+
 NON_GAE_STANDARD_SAMPLES_PY3 = sorted(
     list(set(ALL_TESTED_SAMPLES) - set(GAE_STANDARD_SAMPLES))
 )
@@ -189,7 +170,7 @@ def _session_tests(session, sample, post_install=None):
 
 
 @nox.session(python="2.7")
-@nox.parametrize("sample", GAE_STANDARD_SAMPLES)
+@nox.parametrize("sample", PY2_ONLY_SAMPLES)
 def gae(session, sample):
     """Runs py.test for an App Engine standard sample."""
 
@@ -199,14 +180,7 @@ def gae(session, sample):
         os.mkdir(os.path.join(sample, "lib"))
 
     _session_tests(session, sample, _setup_appengine_sdk)
-
-
-@nox.session(python="2.7")
-@nox.parametrize("sample", NON_GAE_STANDARD_SAMPLES_PY2)
-def py2(session, sample):
-    """Runs py.test for a sample using Python 2.7"""
-    _session_tests(session, sample)
-
+    
 
 @nox.session(python=["3.6", "3.7"])
 @nox.parametrize("sample", NON_GAE_STANDARD_SAMPLES_PY3)

noxfile.py

@@ -167,26 +167,11 @@ def _setup_appengine_sdk(session):
     for sample in ALL_TESTED_SAMPLES
     if sample.startswith("./appengine/standard/")
 ]
-PY2_ONLY_SAMPLES = GAE_STANDARD_SAMPLES
-PY3_ONLY_SAMPLES = [
-    sample
-    for sample in ALL_TESTED_SAMPLES
-    if (
-        sample.startswith("./appengine/standard_python37")
-        or sample.startswith("./functions/")
-        or sample.startswith("./bigquery/pandas-gbq-migration")
-        or sample.startswith("./run/system-package")
-        or sample.startswith("./run/hello-broken")
-    )
-]
-NON_GAE_STANDARD_SAMPLES_PY2 = sorted(
-    list((set(ALL_TESTED_SAMPLES) - set(GAE_STANDARD_SAMPLES)) - set(PY3_ONLY_SAMPLES))
-)
+
 NON_GAE_STANDARD_SAMPLES_PY3 = sorted(
-    list(set(ALL_TESTED_SAMPLES) - set(PY2_ONLY_SAMPLES))
+    list(set(ALL_TESTED_SAMPLES) - set(GAE_STANDARD_SAMPLES))
 )
 
-
 # Filter sample directories if on a CI like Travis or Circle to only run tests
 # for changed samples.
 CHANGED_FILES = _get_changed_files()
@@ -196,13 +181,9 @@ def _setup_appengine_sdk(session):
     ALL_TESTED_SAMPLES = _filter_samples(ALL_TESTED_SAMPLES, CHANGED_FILES)
     ALL_SAMPLE_DIRECTORIES = _filter_samples(ALL_SAMPLE_DIRECTORIES, CHANGED_FILES)
     GAE_STANDARD_SAMPLES = _filter_samples(GAE_STANDARD_SAMPLES, CHANGED_FILES)
-    NON_GAE_STANDARD_SAMPLES_PY2 = _filter_samples(
-        NON_GAE_STANDARD_SAMPLES_PY2, CHANGED_FILES
+    NON_GAE_STANDARD_SAMPLES_PY3 = _filter_samples(	
+        NON_GAE_STANDARD_SAMPLES_PY3, CHANGED_FILES	
     )
-    NON_GAE_STANDARD_SAMPLES_PY3 = _filter_samples(
-        NON_GAE_STANDARD_SAMPLES_PY3, CHANGED_FILES
-    )
-
 
 def _session_tests(session, sample, post_install=None):
     """Runs py.test for a particular sample."""
@@ -239,13 +220,6 @@ def gae(session, sample):
     _session_tests(session, sample, _setup_appengine_sdk)
 
 
-@nox.session(python="2.7")
-@nox.parametrize("sample", NON_GAE_STANDARD_SAMPLES_PY2)
-def py27(session, sample):
-    """Runs py.test for a sample using Python 2.7"""
-    _session_tests(session, sample)
-
-
 @nox.session(python="3.6")
 @nox.parametrize("sample", NON_GAE_STANDARD_SAMPLES_PY3)
 def py36(session, sample):