test: add test to ensure full type when parsing multipart/form-data' (#…

…3683)

test/issue-2283.js

@@ -0,0 +1,26 @@
+'use strict'
+
+const { tspl } = require('@matteo.collina/tspl')
+const { describe, test } = require('node:test')
+const { FormData, Response } = require('..')
+
+describe('https://github.com/nodejs/undici/issues/2283', () => {
+  test('preserve full type when parsing multipart/form-data', async (t) => {
+    t = tspl(t, { plan: 2 })
+    const testBlob = new Blob(['123'], { type: 'text/plain;charset=utf-8' })
+    const fd = new FormData()
+    fd.set('x', testBlob)
+    const res = new Response(fd)
+    res.clone().text().then(body =>
+      // Just making sure that it contains ;charset=utf-8
+      t.ok(body.includes('text/plain;charset=utf-8'))
+    )
+
+    new Response(fd).formData().then(fd => {
+      // returns just 'text/plain'
+      t.ok(fd.get('x').type === 'text/plain;charset=utf-8')
+    })
+
+    await t.completed
+  })
+})