使用 jest 对 aws lambda 进行单元测试

Question

const invokeApi = require("/opt/nodejs/kiwiCall");\nconst decrypt = require("/opt/nodejs/encryption");\nconst cors = require("/opt/nodejs/cors");\n

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当我通过手动模拟模拟目录中的这些依赖项来测试我的index.js文件时，如下所示：

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__mocks__ \n    |_invokeApi\n    |_decrypt\n    |_cors\n

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它说

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FAIL  ./index.test.js\n  \xe2\x97\x8f Test suite failed to run\n\n    Cannot find module \'/opt/nodejs/kiwiCall\' from \'index.js\'\n\n    However, Jest was able to find:\n        \'../../../../lambdas/Flights/Locations/index.js\'\n\n    You might want to include a file extension in your import, or update your \'moduleFileExtensions\', which is currently [\'js\', \'json\', \'jsx\', \'ts\', \'tsx\', \'node\'].\n\n    See https://jestjs.io/docs/en/configuration#modulefileextensions-array-string\n\n      1 | "use strict";\n      2 | \n    > 3 | const invokeApi = require("/opt/nodejs/kiwiCall");\n

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想知道如何在 inedx.test.js 文件中模拟 AWS lambda 的依赖关系

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Answer 1

在 package.json 或 jest.config 中，您可以为该目录添加 moduleNameMapper。

  "jest": {
    "moduleNameMapper": {
      "/opt/nodejs/(.*)": "<rootDir>/../nodejs/$1"
    },
  },