Vitest - FormData不是测试单元的构造函数问题。

Question

我使用Vistest作为测试单元，在带有Vue + Vite的proyect中。我有一个将图像上传到Cloudinary的助手，问题是当运行测试时，Vitest在控制台中返回此错误

Ocurrio un error al intentar subir la imagen TypeError: FormData不是构造函数

这是我的帮手

import axios from "axios";

const uploadImage = async (file) => {
  if (!file) return;

  try {
    const formData = new FormData();

    const objData = {
      file,
      upload_preset: "journal-vue",
    };

    Object.entries(objData).forEach(([key, value]) => {
      formData.append(key, value);
    });

    const url = "https://api.cloudinary.com/v1_1/christian-door/image/upload";

    const { data } = await axios.post(url, formData);

    return data.secure_url;
  } catch (error) {
    console.log("Ocurrio un error al intentar subir la imagen", error);
    return null;
  }
};

export default uploadImage;

这就是测试

import uploadImage from "@/modules/journal/helpers/uploadImage.js";
import axios from "axios";

describe("Test in helper uploadImage", () => {
  test("Must be upload a file and return an url", async () => {
    const url =
      "https://res.cloudinary.com/christian-door/image/upload/v1653891463/fas3px2zm7eq8gt6mfaw.jpg";

    const { data } = await axios.get(url, { responseType: "arraybuffer" });

    const file = new File([data], "image.jpg");

    const urc = await uploadImage(file);

    console.log(urc);
  });
});

构造函数是正确的，它是大写的。此外，我还在文件vite.config.js中更改了“高兴-dom”的环境。

Answer 1

happy-dom没有FormData类，您必须模拟：

// vitest.setup.ts
class FormDataMock {
  append: (name: string, value: string | Blob, fileName?: string) => void = vitest.fn();
  delete: (name: string) => void = vitest.fn();
  get: (name: string) => FormDataEntryValue | null = vitest.fn();
  getAll: (name: string) => FormDataEntryValue[] = vitest.fn();
  has: (name: string) => boolean = vitest.fn();
  set: (name: string, value: string | Blob, fileName?: string) => void = vitest.fn();
  forEach: (callbackfn: (value: FormDataEntryValue, key: string, parent: FormData) => void, thisArg?: any) => void = vitest.fn();
}

// @ts-ignore
global.FormData = FormDataMock;

如果不想模仿FormData，可以使用jsdom。

我发现了一个类似的问题，开玩笑，并作出反应：

FormData is not defined in React Jest

最后一件事是，如果您想测试FormData的内容，可以实现一个简单的FormData类。

还请检查以下内容：Testing FormData submitted to fetch using jest