add py3-flask tests

py3-flask.yaml

@@ -41,3 +41,27 @@ update:
   enabled: true
   release-monitor:
     identifier: 3867
+
+test:
+  environment:
+    contents:
+      packages:
+        - curl
+    environment:
+      FLASK_APP: "/tmp/flask_app.py"
+  pipeline:
+    - name: Test Flask Installation and Server Running Capability
+      runs: |
+        cat <<EOF > /tmp/flask_app.py
+        from flask import Flask
+        app = Flask(__name__)
+
+        @app.route('/')
+        def hello_world():
+            return 'Hello, World!'
+        EOF
+        export FLASK_APP=/tmp/flask_app.py
+        flask run &> /dev/null &
+        flask_pid=$!
+        sleep 2
+        curl -s "http://127.0.0.1:5000/" | grep -q "Hello, World!"