getFormDataMethod.spec.ts

import { createFetch } from '@whatwg-node/fetch';

describe('getFormDataMethod', () => {
  ['fieldsFirst:true', 'fieldsFirst:false'].forEach(fieldsFirstFlag => {
    const fetchAPI = createFetch({
      formDataLimits: {
        fieldsFirst: fieldsFirstFlag === 'fieldsFirst:true',
      },
    });
    describe(fieldsFirstFlag, () => {
      it('should parse fields correctly', async () => {
        const formData = new fetchAPI.FormData();
        formData.append('greetings', 'Hello world!');
        formData.append('bye', 'Goodbye world!');
        const request = new fetchAPI.Request('http://localhost:8080', {
          method: 'POST',
          body: formData,
        });
        const formdata = await request.formData();
        expect(formdata.get('greetings')).toBe('Hello world!');
        expect(formdata.get('bye')).toBe('Goodbye world!');
      });
      it('should parse and receive text files correctly', async () => {
        const formData = new fetchAPI.FormData();
        const greetingsFile = new fetchAPI.File(['Hello world!'], 'greetings.txt', { type: 'text/plain' });
        const byeFile = new fetchAPI.File(['Goodbye world!'], 'bye.txt', { type: 'text/plain' });
        formData.append('greetings', greetingsFile);
        formData.append('bye', byeFile);
        const request = new fetchAPI.Request('http://localhost:8080', {
          method: 'POST',
          body: formData,
        });
        const formdata = await request.formData();
        const receivedGreetingsFile = formdata.get('greetings') as File;
        const receivedGreetingsText = await receivedGreetingsFile.text();
        expect(receivedGreetingsText).toBe('Hello world!');
        const receivedByeFile = formdata.get('bye') as File;
        const receivedByeText = await receivedByeFile.text();
        expect(receivedByeText).toBe('Goodbye world!');
      });
    });
  });
});