Question

在另一个函数导入我的测试模块后，我无法更改另一个函数的模拟行为。 “ functionUsingMockFunction”将调用“ mockFunction”，并应使用其返回值进行处理。但是，按以下方式设置测试时，测试失败，因为“ mockFunction”返回未定义。此外，我可以在任何需要的地方更改npm依赖项的嘲笑实现，但是我不能轻易模仿在自己的模块中导出的函数。 beforeEach中的“ jest.resetModules（）”也不起作用。

jest.mock("../moduleToMock");
const { mockFunction } = require("../moduleToMock");
// if mockFunction.mockImplementation was defined here, it would work
const { functionUsingMockFunction } = require("./someModule");
...
let result;
beforeEach(async () => {
        mockFunction.mockImplementation(() => ({
          // return some object
        }));
        // if functionUsingMockFunction was imported now, it would also work
        result = await functionUsingMockFunction();
      });
      it("does something", () => {
        expect(result).toEqual("some result");
      });
});

此设置可在我的其他项目中使用，因此我认为这可能与我的jest / babel配置有关，但是我没有发现任何重大差异。我正在使用节点10.15.1。我的开发依赖项：

"devDependencies": {
    "@babel/core": "^7.0.0",
    "@babel/plugin-proposal-class-properties": "^7.0.0",
    "@babel/preset-env": "^7.4.4",
    "@babel/preset-react": "^7.0.0",
    "babel-core": "7.0.0-bridge.0",
    "babel-eslint": "^10.0.0",
    "babel-jest": "24.8.0",
    "babel-loader": "^8.0.0",
    "clean-webpack-plugin": "^1.0.0",
    "concurrently": "^4.0.0",
    "css-loader": "^2.0.0",
    "enzyme": "^3.9.0",
    "enzyme-adapter-react-16": "^1.12.1",
    "eslint": "^5.16.0",
    "eslint-config-airbnb": "^17.0.0",
    "eslint-plugin-import": "^2.11.0",
    "eslint-plugin-jest": "^22.5.1",
    "eslint-plugin-jsx-a11y": "^6.0.3",
    "eslint-plugin-react": "^7.7.0",
    "file-loader": "^3.0.0",
    "html-webpack-plugin": "^3.2.0",
    "jest": "24.8.0",
    "nodemon": "^1.17.3",
    "react-test-renderer": "^16.8.6",
    "style-loader": "^0.23.0",
    "url-loader": "^1.0.1",
    "webpack": "^4.5.0",
    "webpack-cli": "^3.0.8",
    "webpack-dev-server": "^3.1.3"
  }

配置：

// babel.config.js
module.exports = {
  presets: ["@babel/preset-env", "@babel/preset-react"],
  plugins: ["@babel/plugin-proposal-class-properties"]
};

// jest.config.js
module.exports = {
  setupFilesAfterEnv: ["./test/setupTests.js"],
  moduleNameMapper: {
    "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$":
      "<rootDir>/__mocks__/fileMock.js",
    "\\.(css|less)$": "<rootDir>/__mocks__/styleMock.js"
  }
};

// setupTests.js
import { configure } from "enzyme";
import Adapter from "enzyme-adapter-react-16";
import "babel-polyfill";

configure({ adapter: new Adapter() });

开玩笑-导入模块后无法更改嘲笑

0 个答案: