aws-sdk-mock 模拟 s3.putBucketPolicy 不起作用

Question

我有这个功能，我想测试一下。

async function PutBucketPolicy(putBucketPolicyParams) {
  logger.debug("---- PutBucketPolicy");
  return new Promise(async(resolve, reject) => {

    s3.putBucketPolicy(putBucketPolicyParams, function(err, data) {
      if (err)
      {
        resolve(err);
        logger.debug("Error occured!");
        logger.debug(err, err.stack); // an error occurred
      }
      else
      {
        resolve(data);
        logger.debug("Data: ", data);
        logger.debug(data); // successful response
      }
    });
  });
}

我想如何测试它：

describe("Testing PutBucketPolicy function", () => {
  describe("when called with a valid bucket policy object and an event then it", () => {
    it("sets the bucket policy through an aws call.", async() => {

      AWSMock.mock("S3","putBucketPolicy",{ "Body": Buffer.from("somestring") });

      const result = await PutBucketPolicy(helper.putBucketPolicyParams);
      expect( result).toMatchObject(helper.resultPolicyObject);

      AWSMock.restore('S3');

    });
  });
});

问题是它总是返回 [ExpiredToken: The provided token has expired.] 因为模拟本身不起作用，它会尝试上网并执行 s3.putBucketPolicy 函数.

我是新手。我应该怎么做才能让它发挥作用？

Answer 1

您需要在方法内初始化S3客户端进行测试，如doc中所述。

注意：AWS 服务需要在函数内部初始化 测试以模拟 SDK 方法，例如用于 AWS Lambda 函数示例 1 将导致配置中未定义的错误区域 而在示例 2 中，sdk 将被成功模拟。

示例 1：

const AWS      = require('aws-sdk');
const sns      = AWS.SNS();
const dynamoDb = AWS.DynamoDB();

exports.handler = function(event, context) {
  // do something with the services e.g. sns.publish
}

示例 2

const AWS = require('aws-sdk');

exports.handler = function(event, context) {
  const sns      = AWS.SNS();
  const dynamoDb = AWS.DynamoDB();
  // do something with the services e.g. sns.publish
}

还要注意，如果你初始化一个 AWS 服务内部的异步函数回调 处理函数，这也不起作用。