如何测试写在 GCP function 文件中的 function

Question

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努力寻找展示如何正确测试这些功能的资源。 具体来说，我需要测试我在这里拥有的功能，以验证随着 GCP Function 的大小和复杂性的增长，这些功能是否保持一致。

GCP 功能的全新功能。 尝试测试文件中写入的函数和代码，以确保它不会恢复。 在测试文件中包含 index.js 文件不提供对文件中函数的访问，但是我不知道如何测试这些。

举一个简单的例子，我有一个 function ，它只是转换日期 object 的助手，因为我们需要以特定方式对其进行格式化。 GCP Function 文件中的 function 称为formatDateValue 。

我想编写一个测试，只在那里发送一个字符串并验证预期的返回。 但它一直告诉我formatDateValue未定义。

我尝试像这样从 index.js 中导出它： exports.formatDateValue = formatDateValue; ，但这并没有改变任何东西。

引用测试文件的文件位于../index.js并且在测试文件中是必需的。

我需要做什么才能访问这个 function 来测试它？

function 代码（为了节省空间，省略了其他功能）

index.js

// Copyright 2022 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 functions_hello_bigquery]
// Import the Google Cloud client library
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();
const functions = require('@google-cloud/functions-framework');
const mysql = require('mysql');
const crypto = require("crypto");

// We need these in the global scope of this file
var hasError = false;
const currentSyncDbDateValue = new Date();

/**
 * 
 * Helper functions that could be moved into some kind of util area
 *
 */
// The challenge here is toISOString converts the time by adding on 5 hours.
function formatDateValue(dateStr, date) {
  let formattedDate;
  if(date != null) {
    const dateArr = dateStr.split(' ');
    const year = dateArr[3]; // Format: 2022
    const day = dateArr[2]; // Format: 15, 02
    const time = dateArr[4]; // Format: 15:17:42
    const month = date.toISOString().split('-')[1]; // Format: 09 - We need to get the month from this, but NOT THE TIME
    formattedDate = `${year}-${month}-${day} ${time}`
  } else {
    formattedDate = null;
  }
  return formattedDate;
}

...

/**
 * HTTP Cloud Function that returns BigQuery query results
 *
 * @param {Object} req Cloud Function request context.
 * @param {Object} res Cloud Function response context.
 */
 functions.http('assetSync', async (req, res) => {
   // Get the tenantId from the req params
   const tenantId = `${req.query.tenantId}`;
   // Get the new asset sync date
  const currentSync = 
  currentSyncDbDateValue.toISOString().replace(/T/, ' ').replace(/\..+/, ''); // replace T with a space, delete the dot and everything after to format the date correctly for the queries
  // returns the last asset sync date formatted, or null if this is the first sync
  const lastAssetSync = await getLastAssetSync(tenantId).then((value) => {return value;});

  try {
    // This is the query to create new lists in the DB.  Returns either the query string or null
    const newListQueryStr = await getNewListsQueryStr(tenantId, currentSync, currentSyncDbDateValue, lastAssetSync);
    const lastAssetSyncQueryStr = await getLastAssetSyncQueryStr(tenantId, currentSync);
    const queriesArr = buildQueriesArr([newListQueryStr, lastAssetSyncQueryStr]);

     const transactionStatus = runTransaction(queriesArr, res);

    res.status(200).send(`Transactions have run successfully`);
  } catch (err) {
     console.error("ERROR : " + err);
     res.status(500).send(`Error querying BigQuery: ${err}`);
  }
});

exports.formatDateValue = formatDateValue;

测试.js

// Copyright 2022 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.
const supertest = require('supertest');
const {getTestServer} = require('@google-cloud/functions- 
framework/testing');
require('../index.js');


describe('Creates correct Dates', () => {
  it('constructs the correct date format', async () => {
    const dateStr = 'Fri Sep 16 2022 15:17:42 GMT-0500 (Central Daylight Time)'; // Current test asset sync value
    const formattedDateStr = formatDateValue(currentTestSync);
    const expectedFormattedDateStr = '2022-09-16 15:17:42';

    assert.equal(formattedDateStr, expectedFormattedDateStr);
  })
})

Answer 1

为了解决这个问题，我必须像这样在 index.js 文件中导出 function：

exports.formatDateValue = formatDateValue;

然后我可以像这样在测试文件中导入它：

const {formatDateValue} = require('../index.js');