GAE、pythonサンプルソースの中に含まれるmain_test.pyというファイルについて

Question

前提

今、pythonで作ったプログラムをGoogle App Engine上で動かそうとテストしています。
↓のGAEの公式チュートリアルを進めています。

https://cloud.google.com/appengine/docs/standard/python3/building-app/deploying-web-service

そこでダウンロードしたサンプルコードで分からないことがあり、質問しました。

発生している問題・エラーメッセージ

ダウンロードしたサンプルコードの中で↓を触っています。
python-docs-samples/appengine/standard/firebase/firenotes/py3/building-an-app/building-an-app-1
その中で↓のコードが含まれています。

app.yaml
main.py                 
main_test.py            
requirements.txt        
static                  
templates

アドバイス頂きたいのは、”　main_test.py　”というファイルの意味です。
チュートリアル上でも特に触れられていないと思います。
GAEのyamlファイルでも”　main_test.py　”というのは特に参照はされていません。
しかし、公式チュートリアルでそんな無意味なファイルが入ったまま配布するとも思えません。

どなたかおわかりになる方、アドバイス頂けませんでしょうか。

参考に、各ファイルのコードを↓に貼ります。

該当のソースコード

app.yaml

runtime: python37

handlers:
  # This configures Google App Engine to serve the files in the app's static
  # directory.
- url: /static
  static_dir: static

  # This handler routes all requests not caught above to your main app. It is
  # required when static routes are defined, but can be omitted (along with
  # the entire handlers section) when there are no static files defined.
- url: /.*
  script: auto

main.py

# Copyright 2018 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.

# [START gae_python37_render_template]
import datetime

from flask import Flask, render_template

app = Flask(__name__)


@app.route('/')
def root():
    # For the sake of example, use static information to inflate the template.
    # This will be replaced with real information in later steps.
    dummy_times = [datetime.datetime(2018, 1, 1, 10, 0, 0),
                   datetime.datetime(2018, 1, 2, 10, 30, 0),
                   datetime.datetime(2018, 1, 3, 11, 0, 0),
                   ]

    return render_template('index.html', times=dummy_times)


if __name__ == '__main__':
    # This is used when running locally only. When deploying to Google App
    # Engine, a webserver process such as Gunicorn will serve the app. This
    # can be configured by adding an `entrypoint` to app.yaml.
    # Flask's development server will automatically serve static files in
    # the "static" directory. See:
    # http://flask.pocoo.org/docs/1.0/quickstart/#static-files. Once deployed,
    # App Engine itself will serve those files as configured in app.yaml.
    app.run(host='127.0.0.1', port=8080, debug=True)
# [START gae_python37_render_template]

main_test.py

# Copyright 2015 Google Inc. All Rights Reserved.
#
# 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.

import main


def test_index():
    main.app.testing = True
    client = main.app.test_client()

    r = client.get('/')
    assert r.status_code == 200

Answer 1

main_test.pyは動作テスト目的以外には使われることはないそうです。
main_test.pyについて言及しているのはここしかありませんでしたが、おそらくすべてのmain_test.pyについて同じことが言えると思います。

https://github.com/GoogleCloudPlatform/python-docs-samples/blob/3d1f403bfad96ffc78a31183239bc8d2bf6572d8/appengine/standard_python37/pubsub/README.md

Note: Not all the files in the current directory are needed to run your code on App Engine. Specifically, main_test.py and the data directory, which contains a mocked private key file and a mocked public certs file, are for testing purposes only. They SHOULD NOT be included in when deploying your app. When your app is up and running, Cloud Pub/Sub creates tokens using a private key, then the Google Auth Python library takes care of verifying and decoding the token using Google's public certs, to confirm that the push requests indeed come from Cloud Pub/Sub.

Comments

[big_naminami]

ありがとうございます！疑問が解消されました！
本当にテスト目的だけだったのですね！
勉強になりました！