add e2e tests scaffolding for appengine flex

Author: kappratiksha

.kokoro/tests/build_appengine_flex.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+# Copyright 2023 Google LLC.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eo pipefail
+
+file="$(pwd)"
+APP_REGION="us-central1"
+export SAMPLE_VERSION="${KOKORO_GIT_COMMIT:-latest}"
+# Builds not triggered by a PR will fall back to the commit hash then "latest".
+SUFFIX=${KOKORO_GITHUB_PULL_REQUEST_NUMBER:-${SAMPLE_VERSION:0:12}}-$(date +%s%N)
+export SERVICE_NAME="${SAMPLE_NAME}-${SUFFIX}"
+
+set -x
+
+if [[ "$file" == *"hello"* ]]; then
+  echo "Deploying App Engine Flex project: ${file}"
+  mvn clean package appengine:deploy \
+    --Dservice-account=$SERVICE_NAME \
+    --region $APP_REGION
+
+fi
+set +x
+
+echo
+echo '---'
+echo
+
+# Do not use exec to preserve trap behavior.
+"$@"
+

.kokoro/tests/run_test_java.sh

@@ -60,6 +60,23 @@ if [[ "$file" == *"functions/helloworld/"* ]]; then
     fi
 fi
 
+# Build and deploy Appengine flex samples
+if [[ "$file" == *"flexible/java-11/"* ]]; then
+    source "$SCRIPT_DIR"/build_appengine_flex.sh
+    EXIT=$?
+
+    if [[ $EXIT -ne 0 ]]; then
+        RTN=1
+        echo -e "\n Appengine Flex build/deploy failed: gcloud returned a non-zero exit code. \n"
+    else
+        echo -e "\n Appengine Flex build/deploy completed.\n"
+
+        # Wait for functions to warm up (and start detecting events)
+        sleep 1m
+    fi
+fi
+
+
 # Use maven to execute the tests for the project.
 mvn --quiet --batch-mode --fail-at-end clean verify \
     -Dfile.encoding="UTF-8" \