Question

我试图用JavaScript创建一个复杂的zip提取器，因此我决定单元测试将非常重要。话虽如此，一位朋友推荐了杰斯特。我无法进行任何测试，所以我做了一个愚蠢的测试，以确保我的JS Enum的第一个值是0。但是，开玩笑总是失败，说它遇到了意外的令牌

我尝试了一个更复杂的测试，并将其简化为这个简单的测试：

enums.js：

const Format = {
    UNKNOWN: 0,
    ZIP: 1,
    TAR_GZIP: 2,
    TAR_BZIP: 3,
};

export default Format

enums.test.js

const {Format} = require("../src/enums.js");

test("bad test", () => {
   expect(Format.UNKNOWN).toBe(0);
});

给我的错误是这样的：

Test suite failed to run

    Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

    By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

    Here's what you can do:
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/en/configuration.html

    Details:

    /home/giovanni/WebstormProjects/extract.js/src/enums.js:7
    export default Format;
    ^^^^^^

    SyntaxError: Unexpected token export

    > 1 | const Format = require("../src/enums.js");
        | ^
      2 | 
      3 | test("bad test", () => {
      4 |    expect(Format.UNKNOWN).toBe(0);

      at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:471:17)
      at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:513:25)
      at Object.<anonymous> (test/enum.test.js:1:1)

Answer 1

使用圣经修正了此问题。使用NPM安装Babel后，我添加了一个.babelrc文件，内容如下：

{
  "presets": ["@babel/preset-env"]
}

这行得通。

笑话-笑话遇到了意外的令牌。香草JS

1 个答案: