Fixed missing file for integration test

Author: andrecsilva

tests/samples/secure_cookie.py

@@ -0,0 +1,9 @@
+from flask import Flask, session, make_response
+
+app = Flask(__name__)
+
+@app.route('/')
+def index():
+    resp = make_response('Custom Cookie Set')
+    resp.set_cookie('custom_cookie', 'value')
+    return resp