How to cover TypeORM @Column decorator with Jest unit testing?

Question

I want to Unit and e2e test my applications as much as possible and my goal is a coverage of 101%. Problem right now with my setup is, that the @Column decorator from typeorm uses an arrow function to set a default value like the current timestamp on a database update. This arrow function is not covered with jest test coverage. Message is: statement not covered

I run the code coverage with: jest --coverage. My versions:

"jest": "^24.9.0",
"typeorm": "^0.2.20"

Jest configuration within package.json:

{
  "jest": {
    "moduleFileExtensions": [
      "js",
      "json",
      "ts"
    ],
    "rootDir": "src",
    "testRegex": ".spec.ts$",
    "transform": {
      "^.+\\.(t|j)s$": "ts-jest"
    },
    "coverageDirectory": "../build/coverage",
    "testEnvironment": "node",
    "coverageThreshold": {
      "global": {
        "branches": 80,
        "functions": 80,
        "lines": 80,
        "statements": -10
      }
    }
  },
}

My entity looks like this:

"jest": "^24.9.0",
"typeorm": "^0.2.20"

Coverage for this entity:

(to post an image i need 10 reputation -.-): https://i.ibb.co/FYQgstP/Screenshot-2019-11-07-11-46-45.png

Answer 1

我遇到了与 GraphQL 装饰器类似的问题。由于所有这些都是函数，您可以做的是创建一个文件，其中包含您将使用的所有函数、命名并导出它们，以便您也可以实际测试它们并使用 Jest 获得覆盖范围。（测试字面上应该类似expect(namedFunction).toBe('CURRENT_TIMESTAMP()')或非常相似。例如，您可以在此处查看我的函数和在此处查看我的测试。

编辑 11/03/2020

代码示例不再赘述。话虽如此，你可以做这样的事情

export const returnString = () => String;

@Query(returnString)

对于 GraphQL。对此的测试看起来像

expect(returnString()).toBe(String);