diff --git a/lib/web/fetch/formdata-parser.js b/lib/web/fetch/formdata-parser.js
index 4ba204cfa12..b65848998f7 100644
--- a/lib/web/fetch/formdata-parser.js
+++ b/lib/web/fetch/formdata-parser.js
@@ -6,10 +6,10 @@ const { makeEntry } = require('./formdata')
 const { webidl } = require('../webidl')
 const assert = require('node:assert')
 const { isomorphicDecode } = require('../infra')
-const { utf8DecodeBytes } = require('../../encoding')
 
 const dd = Buffer.from('--')
 const decoder = new TextDecoder()
+const decoderIgnoreBOM = new TextDecoder('utf-8', { ignoreBOM: true })
 
 /**
  * @param {string} chars
@@ -188,7 +188,7 @@ function multipartFormDataParser (input, mimeType) {
       // 5.11. Otherwise:
 
       // 5.11.1. Let value be the UTF-8 decoding without BOM of body.
-      value = utf8DecodeBytes(Buffer.from(body))
+      value = decoderIgnoreBOM.decode(Buffer.from(body))
     }
 
     // 5.12. Assert: name is a scalar value string and value is either a scalar value string or a File object.
diff --git a/test/busboy/formdata-test.js b/test/busboy/formdata-test.js
new file mode 100644
index 00000000000..78aef46709b
--- /dev/null
+++ b/test/busboy/formdata-test.js
@@ -0,0 +1,387 @@
+'use strict'
+
+// Copyright 2009 The Go Authors.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google LLC nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// https://github.com/golang/go/blob/16e5d24480dca7ddcbdffb78a8ed5de3e5155dec/src/mime/multipart/formdata_test.go
+
+const { test } = require('node:test')
+const { Response } = require('../..')
+
+const fileaContents = 'This is a test file.'
+const filebContents = 'Another test file.'
+const textaValue = 'foo'
+const textbValue = 'bar'
+const boundary = 'MyBoundary'
+
+const message = [
+  '--MyBoundary',
+  'Content-Disposition: form-data; name="filea"; filename="filea.txt"',
+  'Content-Type: text/plain',
+  '',
+  fileaContents,
+  '--MyBoundary',
+  'Content-Disposition: form-data; name="fileb"; filename="fileb.txt"',
+  'Content-Type: text/plain',
+  '',
+  filebContents,
+  '--MyBoundary',
+  'Content-Disposition: form-data; name="texta"',
+  '',
+  textaValue,
+  '--MyBoundary',
+  'Content-Disposition: form-data; name="textb"',
+  '',
+  textbValue,
+  '--MyBoundary--'
+].join('\r\n')
+
+const messageWithFileWithoutName = [
+  '--MyBoundary',
+  'Content-Disposition: form-data; name="hiddenfile"; filename=""',
+  'Content-Type: text/plain',
+  '',
+  filebContents,
+  '--MyBoundary--'
+].join('\r\n')
+
+const messageWithFileName = [
+  '--MyBoundary',
+  'Content-Disposition: form-data; name="filea"; filename="filea.txt"',
+  'Content-Type: text/plain',
+  '',
+  fileaContents,
+  '--MyBoundary--'
+].join('\r\n')
+
+const messageWithTextContentType = [
+  '--MyBoundary',
+  'Content-Disposition: form-data; name="texta"',
+  'Content-Type: text/plain',
+  '',
+  textaValue,
+  '--MyBoundary--'
+].join('\r\n')
+
+function makeResponse (body, bnd) {
+  return new Response(body, {
+    headers: {
+      'content-type': `multipart/form-data; boundary=${bnd}`
+    }
+  })
+}
+
+test('ReadForm - fields and files', async (t) => {
+  const response = makeResponse(message, boundary)
+  const fd = await response.formData()
+
+  t.assert.strictEqual(fd.get('texta'), textaValue, 'texta value mismatch')
+  t.assert.strictEqual(fd.get('textb'), textbValue, 'textb value mismatch')
+
+  const filea = fd.get('filea')
+  t.assert.strictEqual(filea.name, 'filea.txt', 'filea filename mismatch')
+  t.assert.strictEqual(filea.size, fileaContents.length, 'filea size mismatch')
+  t.assert.strictEqual(await filea.text(), fileaContents, 'filea contents mismatch')
+
+  const fileb = fd.get('fileb')
+  t.assert.strictEqual(fileb.name, 'fileb.txt', 'fileb filename mismatch')
+  t.assert.strictEqual(fileb.size, filebContents.length, 'fileb size mismatch')
+  t.assert.strictEqual(await fileb.text(), filebContents, 'fileb contents mismatch')
+})
+
+test('ReadForm - file without name', async (t) => {
+  const response = makeResponse(messageWithFileWithoutName, boundary)
+  const fd = await response.formData()
+
+  // A file with an empty filename is treated as a field in the web platform FormData
+  const value = fd.get('hiddenfile')
+  if (typeof value === 'string') {
+    t.assert.strictEqual(value, filebContents, 'hiddenfile value mismatch')
+  } else {
+    t.assert.strictEqual(await value.text(), filebContents, 'hiddenfile contents mismatch')
+  }
+})
+
+test('ReadForm - file with filename', async (t) => {
+  const response = makeResponse(messageWithFileName, boundary)
+  const fd = await response.formData()
+
+  const filea = fd.get('filea')
+  t.assert.strictEqual(filea.name, 'filea.txt', 'filea filename mismatch')
+  t.assert.strictEqual(await filea.text(), fileaContents, 'filea contents mismatch')
+})
+
+test('ReadForm - text content type', async (t) => {
+  const response = makeResponse(messageWithTextContentType, boundary)
+  const fd = await response.formData()
+
+  t.assert.strictEqual(fd.get('texta'), textaValue, 'texta value mismatch')
+})
+
+test('ReadForm - no read after EOF', async (t) => {
+  const eofBoundary = '---------------------------8d345eef0d38dc9'
+  const body = [
+    '-----------------------------8d345eef0d38dc9',
+    'Content-Disposition: form-data; name="version"',
+    '',
+    '171',
+    '-----------------------------8d345eef0d38dc9--'
+  ].join('\r\n')
+
+  const response = makeResponse(body, eofBoundary)
+  const fd = await response.formData()
+
+  t.assert.strictEqual(fd.get('version'), '171', 'version value mismatch')
+})
+
+test('ReadForm - non-file max memory (large text value)', async (t) => {
+  const n = 10 << 20 // 10 MB
+  const largeTextValue = '1'.repeat(n)
+  const body = [
+    '--MyBoundary',
+    'Content-Disposition: form-data; name="largetext"',
+    '',
+    largeTextValue,
+    '--MyBoundary--'
+  ].join('\r\n')
+
+  const response = makeResponse(body, boundary)
+  const fd = await response.formData()
+
+  t.assert.strictEqual(fd.get('largetext'), largeTextValue, 'largetext value mismatch')
+})
+
+test('ReadForm - many files', async (t) => {
+  const numFiles = 10
+  const parts = []
+  const fileBoundary = 'TestBoundary'
+
+  for (let i = 0; i < numFiles; i++) {
+    parts.push(
+      `--${fileBoundary}`,
+      `Content-Disposition: form-data; name="${i}"; filename="${i}"`,
+      'Content-Type: application/octet-stream',
+      '',
+      `${i}`
+    )
+  }
+  parts.push(`--${fileBoundary}--`)
+  const body = parts.join('\r\n')
+
+  const response = makeResponse(body, fileBoundary)
+  const fd = await response.formData()
+
+  for (let i = 0; i < numFiles; i++) {
+    const file = fd.get(`${i}`)
+    t.assert.ok(file, `file "${i}" should exist`)
+    t.assert.strictEqual(file.name, `${i}`, `file "${i}" filename mismatch`)
+    const text = await file.text()
+    t.assert.strictEqual(text, `${i}`, `file "${i}" contents mismatch`)
+  }
+})
+
+test('ReadForm - limits with many values', async (t) => {
+  const numValues = 100
+  const parts = []
+  const limitBoundary = 'LimitBoundary'
+
+  for (let i = 0; i < numValues; i++) {
+    parts.push(
+      `--${limitBoundary}`,
+      `Content-Disposition: form-data; name="field${i}"`,
+      '',
+      `value ${i}`
+    )
+  }
+  parts.push(`--${limitBoundary}--`)
+  const body = parts.join('\r\n')
+
+  const response = makeResponse(body, limitBoundary)
+  const fd = await response.formData()
+
+  for (let i = 0; i < numValues; i++) {
+    t.assert.strictEqual(
+      fd.get(`field${i}`),
+      `value ${i}`,
+      `field${i} value mismatch`
+    )
+  }
+})
+
+test('ReadForm - limits with values and files', async (t) => {
+  const numValues = 50
+  const numFiles = 50
+  const parts = []
+  const limitBoundary = 'LimitBoundary'
+
+  for (let i = 0; i < numValues; i++) {
+    parts.push(
+      `--${limitBoundary}`,
+      `Content-Disposition: form-data; name="field${i}"`,
+      '',
+      `value ${i}`
+    )
+  }
+  for (let i = 0; i < numFiles; i++) {
+    parts.push(
+      `--${limitBoundary}`,
+      `Content-Disposition: form-data; name="file${i}"; filename="file${i}"`,
+      'Content-Type: application/octet-stream',
+      '',
+      `value ${i}`
+    )
+  }
+  parts.push(`--${limitBoundary}--`)
+  const body = parts.join('\r\n')
+
+  const response = makeResponse(body, limitBoundary)
+  const fd = await response.formData()
+
+  for (let i = 0; i < numValues; i++) {
+    t.assert.strictEqual(
+      fd.get(`field${i}`),
+      `value ${i}`,
+      `field${i} value mismatch`
+    )
+  }
+  for (let i = 0; i < numFiles; i++) {
+    const file = fd.get(`file${i}`)
+    t.assert.ok(file, `file${i} should exist`)
+    const text = await file.text()
+    t.assert.strictEqual(text, `value ${i}`, `file${i} contents mismatch`)
+  }
+})
+
+test('ReadForm - metadata too large (large field name)', async (t) => {
+  const largeName = 'a'.repeat(10 << 20)
+  const body = [
+    '--MyBoundary',
+    `Content-Disposition: form-data; name="${largeName}"`,
+    '',
+    'value',
+    '--MyBoundary--'
+  ].join('\r\n')
+
+  const response = makeResponse(body, boundary)
+
+  // Expect parsing to either succeed (implementation dependent) or throw
+  try {
+    const fd = await response.formData()
+    // If it succeeds, the value should be correct
+    t.assert.strictEqual(fd.get(largeName), 'value')
+  } catch (err) {
+    // Implementation may reject overly large metadata
+    t.assert.ok(err, 'error thrown for large metadata')
+  }
+})
+
+test('ReadForm - metadata too large (large MIME header)', async (t) => {
+  const largeHeaderValue = 'a'.repeat(10 << 20)
+  const body = [
+    '--MyBoundary',
+    'Content-Disposition: form-data; name="a"',
+    `X-Foo: ${largeHeaderValue}`,
+    '',
+    'value',
+    '--MyBoundary--'
+  ].join('\r\n')
+
+  const response = makeResponse(body, boundary)
+
+  try {
+    const fd = await response.formData()
+    t.assert.strictEqual(fd.get('a'), 'value')
+  } catch (err) {
+    t.assert.ok(err, 'error thrown for large MIME header')
+  }
+})
+
+test('ReadForm - metadata too large (many parts)', async (t) => {
+  const parts = []
+  const numParts = 110000
+
+  for (let i = 0; i < numParts; i++) {
+    parts.push(
+      '--MyBoundary',
+      'Content-Disposition: form-data; name="f"',
+      '',
+      'v'
+    )
+  }
+  parts.push('--MyBoundary--')
+  const body = parts.join('\r\n')
+
+  const response = makeResponse(body, boundary)
+
+  try {
+    const fd = await response.formData()
+    // If it succeeds, check that values are present
+    t.assert.ok(fd.getAll('f').length > 0)
+  } catch (err) {
+    // Implementation may reject too many parts
+    t.assert.ok(err, 'error thrown for too many parts')
+  }
+})
+
+test('ReadForm - endless header line (name)', async (t) => {
+  // Create a body with an extremely long header name that never ends
+  const longPrefix = 'X-' + 'X'.repeat(1 << 20)
+  const body = [
+    '--MyBoundary',
+    'Content-Disposition: form-data; name="a"',
+    'Content-Type: text/plain',
+    longPrefix
+  ].join('\r\n')
+
+  const response = makeResponse(body, boundary)
+
+  try {
+    await response.formData()
+    // If parsing succeeds (truncated or ignored), that's acceptable
+  } catch (err) {
+    t.assert.ok(err, 'error thrown for endless header line')
+  }
+})
+
+test('ReadForm - endless header line (value)', async (t) => {
+  const longValue = 'X-Header: ' + 'X'.repeat(1 << 20)
+  const body = [
+    '--MyBoundary',
+    'Content-Disposition: form-data; name="a"',
+    'Content-Type: text/plain',
+    longValue
+  ].join('\r\n')
+
+  const response = makeResponse(body, boundary)
+
+  try {
+    await response.formData()
+  } catch (err) {
+    t.assert.ok(err, 'error thrown for endless header value')
+  }
+})
diff --git a/test/busboy/test-parser.js b/test/busboy/test-parser.js
new file mode 100644
index 00000000000..b5f4b725f59
--- /dev/null
+++ b/test/busboy/test-parser.js
@@ -0,0 +1,712 @@
+'use strict'
+
+// Copyright (c) 2010-2025, Marcel Hellkamp
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+// https://github.com/defnull/multipart/blob/d390c3a98a619f4445d7f340d6022b0ccad2ca8e/test/test_push_parser.py
+
+const { test } = require('node:test')
+const { Response } = require('../..')
+
+function b64decode (input) {
+  return Buffer.from(input, 'base64').toString()
+}
+
+function makeResponse (body, bnd) {
+  return new Response(body, {
+    headers: {
+      'content-type': `multipart/form-data; boundary=${bnd}`
+    }
+  })
+}
+
+const legacyTests = {
+  'firefox3-2png1txt': [
+    '-----------------------------186454651713519341951581030105\r\n',
+    'Content-Disposition: form-data; name="file1"; filename="anchor.png"\r\n',
+    'Content-Type: image/png\r\n',
+    '\r\n',
+    '[file1-data]\r\n',
+    '-----------------------------186454651713519341951581030105\r\n',
+    'Content-Disposition: form-data; name="file2"; filename="application_edit.png"\r\n',
+    'Content-Type: image/png\r\n',
+    '\r\n',
+    '[file2-data]\r\n',
+    '-----------------------------186454651713519341951581030105\r\n',
+    'Content-Disposition: form-data; name="text"\r\n',
+    '\r\n',
+    '[Text]\r\n',
+    '-----------------------------186454651713519341951581030105--\r\n'
+  ],
+  'firefox3-2pnglongtext': [
+    '-----------------------------14904044739787191031754711748\r\n',
+    'Content-Disposition: form-data; name="file1"; filename="accept.png"\r\n',
+    'Content-Type: image/png\r\n',
+    '\r\n',
+    '[file1-data]\r\n',
+    '-----------------------------14904044739787191031754711748\r\n',
+    'Content-Disposition: form-data; name="file2"; filename="add.png"\r\n',
+    'Content-Type: image/png\r\n',
+    '\r\n',
+    '[file2-data]\r\n',
+    '-----------------------------14904044739787191031754711748\r\n',
+    'Content-Disposition: form-data; name="text"\r\n',
+    '\r\n',
+    '[Text]\r\n',
+    '-----------------------------14904044739787191031754711748--\r\n'
+  ],
+  'opera8-2png1txt': [
+    '------------zEO9jQKmLc2Cq88c23Dx19\r\n',
+    'Content-Disposition: form-data; name="file1"; filename="arrow_branch.png"\r\n',
+    'Content-Type: image/png\r\n',
+    '\r\n',
+    '[file1-data]\r\n',
+    '------------zEO9jQKmLc2Cq88c23Dx19\r\n',
+    'Content-Disposition: form-data; name="file2"; filename="award_star_bronze_1.png"\r\n',
+    'Content-Type: image/png\r\n',
+    '\r\n',
+    '[file2-data]\r\n',
+    '------------zEO9jQKmLc2Cq88c23Dx19\r\n',
+    'Content-Disposition: form-data; name="text"\r\n',
+    '\r\n',
+    '[Text]\r\n',
+    '------------zEO9jQKmLc2Cq88c23Dx19--\r\n'
+  ],
+  'webkit3-2png1txt': [
+    '------WebKitFormBoundaryjdSFhcARk8fyGNy6\r\n',
+    'Content-Disposition: form-data; name="file1"; filename="gtk-apply.png"\r\n',
+    'Content-Type: image/png\r\n',
+    '\r\n',
+    '[file1-data]\r\n',
+    '------WebKitFormBoundaryjdSFhcARk8fyGNy6\r\n',
+    'Content-Disposition: form-data; name="file2"; filename="gtk-no.png"\r\n',
+    'Content-Type: image/png\r\n',
+    '\r\n',
+    '[file2-data]\r\n',
+    '------WebKitFormBoundaryjdSFhcARk8fyGNy6\r\n',
+    'Content-Disposition: form-data; name="text"\r\n',
+    '\r\n',
+    '[Text]\r\n',
+    '------WebKitFormBoundaryjdSFhcARk8fyGNy6--\r\n'
+  ],
+  'ie6-2png1txt': [
+    '-----------------------------7d91b03a20128\r\n',
+    'Content-Disposition: form-data; name="file1"; filename="C:\\Python25\\wztest\\werkzeug-main\\tests\\multipart\\firefox3-2png1txt\\file1.png"\r\n',
+    'Content-Type: image/x-png\r\n',
+    '\r\n',
+    '[file1-data]\r\n',
+    '-----------------------------7d91b03a20128\r\n',
+    'Content-Disposition: form-data; name="file2"; filename="C:\\Python25\\wztest\\werkzeug-main\\tests\\multipart\\firefox3-2png1txt\\file2.png"\r\n',
+    'Content-Type: image/x-png\r\n',
+    '\r\n',
+    '[file2-data]\r\n',
+    '-----------------------------7d91b03a20128\r\n',
+    'Content-Disposition: form-data; name="text"\r\n',
+    '\r\n',
+    '[Text]\r\n',
+    '-----------------------------7d91b03a20128--\r\n'
+  ]
+}
+
+const browserTestCases = {
+  'firefox3-2png1txt': {
+    data: b64decode(
+        `
+LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0xODY0NTQ2NTE3MTM1MTkzNDE5NTE1ODEwMzAx
+MDUNCkNvbnRlbnQtRGlzcG9zaXRpb246IGZvcm0tZGF0YTsgbmFtZT0iZmlsZTEiOyBmaWxlbmFt
+ZT0iYW5jaG9yLnBuZyINCkNvbnRlbnQtVHlwZTogaW1hZ2UvcG5nDQoNColQTkcNChoKAAAADUlI
+RFIAAAAQAAAAEAgGAAAAH/P/YQAAAARnQU1BAACvyDcFiukAAAAZdEVYdFNvZnR3YXJlAEFkb2Jl
+IEltYWdlUmVhZHlxyWU8AAABnUlEQVQ4y6VTMWvCQBS+qwEFB10KGaS1P6FDpw7SrVvzAwRRx04V
+Ck4K6iAoDhLXdhFcW9qhZCk4FQoW0gp2U4lQRDAUS4hJmn5Xgg2lsQ198PHu3b3vu5d3L9S2bfIf
+47wOer1ewzTNtGEYBP48kUjkfsrb8BIAMb1cLovwRfi07wrYzcCr4/1/Am4FzzhzBGZeefR7E7vd
+7j0Iu4wYjUYDBMfD0dBiMUQfstns3toKkHgF6EgmqqruW6bFiHcsxr70awVu63Q6NiOmUinquwfM
+dF1f28CVgCRJx0jMAQ1BEFquRn7CbYVCYZVbr9dbnJMohoIh9kViu90WEW9nMpmxu4JyubyF/VEs
+FiNcgCPyoyxiu7XhCPBzdU4s652VnUccbDabPLyN2C6VSmwdhFgel5DB84AJb64mEUlvmqadTKcv
+40gkUkUsg1DjeZ7iRsrWgByP71T7/afxYrHIYry/eoBD9mxsaK4VRamFw2EBQknMAWGvRClNTpQJ
+AfkCxFNgBmiez1ipVA4hdgQcOD/TLfylKIo3vubgL/YBnIw+ioOMLtwAAAAASUVORK5CYIINCi0t
+LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tMTg2NDU0NjUxNzEzNTE5MzQxOTUxNTgxMDMwMTA1
+DQpDb250ZW50LURpc3Bvc2l0aW9uOiBmb3JtLWRhdGE7IG5hbWU9ImZpbGUyIjsgZmlsZW5hbWU9
+ImFwcGxpY2F0aW9uX2VkaXQucG5nIg0KQ29udGVudC1UeXBlOiBpbWFnZS9wbmcNCg0KiVBORw0K
+GgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK6QAAABl0RVh0U29mdHdh
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+L2Is4r+y7hRwxs8G5mUzPxmrwcA8hvnmjIZtcxmr3Y09hHwzJZQvOAwwNZyCYqgaThVXMFzBCD7f
+Jfv8MpHiKvaV3ePV2f07fMwIiSeIGeYJJoao4HmCiIeIQzPXifY+paJqO4lZi/nWPZ/krabjvlNH
+yANMBAQiBiqgakQMCunbxHJviM9bQeZdBzHJUzKhguLJlQnf1BghAmZ4gImAgAjk++8jP56QmL2G
+XG8zsfFCz8skA1mQXKbaU3X8ISIgQsgDcun7FL7cJjFnLUMfLyLRr0SLS4hbhiup5Szd19rpFYKA
+ESKICCERoS95neyHmyTmbmAodQ4vGpAfmEn6YTtTahv4ODiRkGdOCUUAAUSE/uQNfqTaKFu4jvyn
+JiIxIzcwg/SjF1RsOk9R+QJMlZCvqvwhQFdbM4XvrynIVHpfn2ZSWYyhzHS+PUtSueUC0cQ0QmpG
+yE9197TUnwzq1DnUKbXSxOb6S7xtPkjngzbGVVbzvS/FjaGt9DU8xlRRJdTCMDEzRjuyZ1FwaFe9
+j+d4eecaPd1dPxNTSlfWHm1v5y/EzBitblXp4JLZ5f6yBbOwaK5tsD+9c33jq/f8w2+mRSjOllPh
+kAAAAABJRU5ErkJggg0KLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0xODY0NTQ2NTE3MTM1
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+NDY1MTcxMzUxOTM0MTk1MTU4MTAzMDEwNS0tDQo=`
+    ),
+    boundary: '---------------------------186454651713519341951581030105',
+    files: {
+      file1: [
+        'anchor.png',
+        'image/png',
+        b64decode(
+                `
+iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK6QAAABl0RVh0
+U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAGdSURBVDjLpVMxa8JAFL6rAQUHXQoZpLU/
+oUOnDtKtW/MDBFHHThUKTgrqICgOEtd2EVxb2qFkKTgVChbSCnZTiVBEMBRLiEmafleCDaWxDX3w
+8e7dve+7l3cv1LZt8h/jvA56vV7DNM20YRgE/jyRSOR+ytvwEgAxvVwui/BF+LTvCtjNwKvj/X8C
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+b2cymbG7gnK5vIX9USwWI1yAI/KjLGK7teEI8HN1TizrnZWdRxxsNps8vI3YLpVKbB2EWB6XkMHz
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+YQFCScwBYa9EKU1OlAkB+QLEU2AGaJ7PWKlUDiF2BBw4P9Mt/KUoije+5uAv9gGcjD6Kg4wu3AAA
+AABJRU5ErkJggg==`
+        )
+      ],
+      file2: [
+        'application_edit.png',
+        'image/png',
+        b64decode(
+                `
+iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK6QAAABl0RVh0
+U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAJRSURBVBgZpcHda81xHMDx9+d3fudYzuYw
+2RaZ5yTWolEiuZpCSjGJFEktUUr8A6ZxQZGHmDtqdrGUXHgoeZqSp1F2bLFWjtkOB8PZzvmd7+dj
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+P56QmL2GXG8zsfFCz8skA1mQXKbaU3X8ISIgQsgDcun7FL7cJjFnLUMfLyLRr0SLS4hbhiup5Szd
+19rpFYKAESKICCERoS95neyHmyTmbmAodQ4vGpAfmEn6YTtTahv4ODiRkGdOCUUAAUSE/uQNfqTa
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+Z1FwaFe9j+d4eecaPd1dPxNTSlfWHm1v5y/EzBitblXp4JLZ5f6yBbOwaK5tsD+9c33jq/f8w2+m
+RSjOllPhkAAAAABJRU5ErkJggg==`
+        )
+      ]
+    },
+    forms: { text: 'example text' }
+  },
+
+  'firefox3-2pnglongtext': {
+    data: b64decode(
+        `
+LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0xNDkwNDA0NDczOTc4NzE5MTAzMTc1NDcxMTc0
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+09290jZj2EyLMnJexkgpLbPUanNOberU5taUMnHZUULMvelCtWF0sW/n7MVMEiN64AsPD8/n83uu
+cQDi/id/DBT4Dolypw/qsz0pTMbj/WHpiDgsdSUyUmeiPt2+V7SrIM+bSss8ySGdR4abQQv6lrui
+6VxsRonrGCS9VEjSQ9E7CtiqdOZ4UuTqnBHO1X7YXl6Daa4yGq7vWO1D40wVDtj4kWQbn94myPGk
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+v/Ff8wtn0KzlebrUYwAAAABJRU5ErkJggg0KLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0x
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+ZS9wbmcNCg0KiVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK
+6QAAABl0RVh0U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAJvSURBVDjLpZPrS5NhGIf9
+W7YvBYOkhlkoqCklWChv2WyKik7blnNris72bi6dus0DLZ0TDxW1odtopDs4D8MDZuLU0kXq61Ci
+jSIIasOvv94VTUfLiB74fXngup7nvrnvJABJ/5PfLnTTdcwOj4RsdYmo5glBWP6iOtzwvIKSWstI
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+WUdNFJqLGFVPC4OkR4BxajTWsChY64wmCnMxsWPCHcutKBxMVp5mxA1S+aMComToaqTRUQknLTH6
+2kHOVEE+VQnjahscNCy0cMBWsSI0TCQcZc5ALkEYckL5A5noWSBhfm2AecMAjbcRWV0pUTh0HE64
+TNf0mczcnnQyu/MilaFJCae1nw2fbz1DnVOxyGTlKeZft/Ff8x1BRssfACjTwQAAAABJRU5ErkJg
+gg0KLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0xNDkwNDA0NDczOTc4NzE5MTAzMTc1NDcx
+MTc0OA0KQ29udGVudC1EaXNwb3NpdGlvbjogZm9ybS1kYXRhOyBuYW1lPSJ0ZXh0Ig0KDQotLWxv
+bmcgdGV4dA0KLS13aXRoIGJvdW5kYXJ5DQotLWxvb2thbGlrZXMtLQ0KLS0tLS0tLS0tLS0tLS0t
+LS0tLS0tLS0tLS0tLS0xNDkwNDA0NDczOTc4NzE5MTAzMTc1NDcxMTc0OC0tDQo=`
+    ),
+    boundary: '---------------------------14904044739787191031754711748',
+    files: {
+      file1: [
+        'accept.png',
+        'image/png',
+        b64decode(
+                `
+iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK6QAAABl0RVh0
+U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAKfSURBVDjLpZPrS1NhHMf9O3bOdmwDCWRE
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+/rH5HW3PLsEwUYy+YCcERmIjJpDcpzb6l7th9KtQ69fi09ePUej9l7cx2DJbD7UrG3r3afQHOyCo
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+nAPVkAxKBxcOzsajpS4Yh4ohUPPWKTUh3PaQEptIOr6BiJjcZXCwktaAGfrRIpwblqOV3YKdhfXO
+IvBLeREWpnd8ynsaSJoyESFphwTtfjN6X1jRO2+FxWtCWksqBApeiFIR9K6fiTpPiigDoadqCEag
+5YUFKl6Yrciw0VOlhOivv/Ff8wtn0KzlebrUYwAAAABJRU5ErkJggg==`
+        )
+      ],
+      file2: [
+        'add.png',
+        'image/png',
+        b64decode(
+                `
+iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK6QAAABl0RVh0
+U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAJvSURBVDjLpZPrS5NhGIf9W7YvBYOkhlko
+qCklWChv2WyKik7blnNris72bi6dus0DLZ0TDxW1odtopDs4D8MDZuLU0kXq61CijSIIasOvv94V
+TUfLiB74fXngup7nvrnvJABJ/5PfLnTTdcwOj4RsdYmo5glBWP6iOtzwvIKSWstI0Wgx80SBblpK
+tE9KQs/We7EaWoT/8wbWP61gMmCH0lMDvokT4j25TiQU/ITFkek9Ow6+7WH2gwsmahCPdwyw75uw
+9HEO2gUZSkfyI9zBPCJOoJ2SMmg46N61YO/rNoa39Xi41oFuXysMfh36/Fp0b7bAfWAH6RGi0Hgl
+WNCbzYgJaFjRv6zGuy+b9It96N3SQvNKiV9HvSaDfFEIxXItnPs23BzJQd6DDEVM0OKsoVwBG/1V
+MzpXVWhbkUM2K4oJBDYuGmbKIJ0qxsAbHfRLzbjcnUbFBIpx/qH3vQv9b3U03IQ/HfFkERTzfFj8
+w8jSpR7GBE123uFEYAzaDRIqX/2JAtJbDat/COkd7CNBva2cMvq0MGxp0PRSCPF8BXjWG3FgNHc9
+XPT71Ojy3sMFdfJRCeKxEsVtKwFHwALZfCUk3tIfNR8XiJwc1LmL4dg141JPKtj3WUdNFJqLGFVP
+C4OkR4BxajTWsChY64wmCnMxsWPCHcutKBxMVp5mxA1S+aMComToaqTRUQknLTH62kHOVEE+VQnj
+ahscNCy0cMBWsSI0TCQcZc5ALkEYckL5A5noWSBhfm2AecMAjbcRWV0pUTh0HE64TNf0mczcnnQy
+u/MilaFJCae1nw2fbz1DnVOxyGTlKeZft/Ff8x1BRssfACjTwQAAAABJRU5ErkJggg==`
+        )
+      ]
+    },
+    forms: { text: '--long text\r\n--with boundary\r\n--lookalikes--' }
+  },
+
+  'opera8-2png1txt': {
+    data: b64decode(
+        `
+LS0tLS0tLS0tLS0tekVPOWpRS21MYzJDcTg4YzIzRHgxOQ0KQ29udGVudC1EaXNwb3NpdGlvbjog
+Zm9ybS1kYXRhOyBuYW1lPSJmaWxlMSI7IGZpbGVuYW1lPSJhcnJvd19icmFuY2gucG5nIg0KQ29u
+dGVudC1UeXBlOiBpbWFnZS9wbmcNCg0KiVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9h
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+LS0tLXpFTzlqUUttTGMyQ3E4OGMyM0R4MTktLQ0K`
+    ),
+    boundary: '----------zEO9jQKmLc2Cq88c23Dx19',
+    files: {
+      file1: [
+        'arrow_branch.png',
+        'image/png',
+        b64decode(
+                `
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+AAAAAElFTkSuQmCC`
+        )
+      ],
+      file2: [
+        'award_star_bronze_1.png',
+        'image/png',
+        b64decode(
+                `
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+        )
+      ]
+    },
+    forms: { text: 'blafasel öäü' }
+  },
+
+  'webkit3-2png1txt': {
+    data: b64decode(
+        `
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+QVJrOGZ5R055Ni0tDQo=`
+    ),
+    boundary: '----WebKitFormBoundaryjdSFhcARk8fyGNy6',
+    files: {
+      file1: [
+        'gtk-apply.png',
+        'image/png',
+        b64decode(
+                `
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+        )
+      ],
+      file2: [
+        'gtk-no.png',
+        'image/png',
+        b64decode(
+                `
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+        )
+      ]
+    },
+    forms: { text: 'this is another text with ümläüts' }
+  },
+
+  'ie6-2png1txt': {
+    data: b64decode(
+        `
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+    ),
+    boundary: '---------------------------7d91b03a20128',
+    files: {
+      file1: [
+        'C:\\Python25\\wztest\\werkzeug-main\\tests\\multipart\\firefox3-2png1txt\\file1.png',
+        'image/x-png',
+        b64decode(
+                `
+iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK6QAAABl0RVh0
+U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAGdSURBVDjLpVMxa8JAFL6rAQUHXQoZpLU/
+oUOnDtKtW/MDBFHHThUKTgrqICgOEtd2EVxb2qFkKTgVChbSCnZTiVBEMBRLiEmafleCDaWxDX3w
+8e7dve+7l3cv1LZt8h/jvA56vV7DNM20YRgE/jyRSOR+ytvwEgAxvVwui/BF+LTvCtjNwKvj/X8C
+bgXPOHMEZl559HsTu93uPQi7jBiNRgMEx8PR0GIxRB+y2eze2gqQeAXoSCaqqu5bpsWIdyzGvvRr
+BW7rdDo2I6ZSKeq7B8x0XV/bwJWAJEnHSMwBDUEQWq5GfsJthUJhlVuv11uckyiGgiH2RWK73RYR
+b2cymbG7gnK5vIX9USwWI1yAI/KjLGK7teEI8HN1TizrnZWdRxxsNps8vI3YLpVKbB2EWB6XkMHz
+gAlvriYRSW+app1Mpy/jSCRSRSyDUON5nuJGytaAHI/vVPv9p/FischivL96gEP2bGxorhVFqYXD
+YQFCScwBYa9EKU1OlAkB+QLEU2AGaJ7PWKlUDiF2BBw4P9Mt/KUoije+5uAv9gGcjD6Kg4wu3AAA
+AABJRU5ErkJggg==`
+        )
+      ],
+      file2: [
+        'C:\\Python25\\wztest\\werkzeug-main\\tests\\multipart\\firefox3-2png1txt\\file2.png',
+        'image/x-png',
+        b64decode(
+                `
+iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABGdBTUEAAK/INwWK6QAAABl0RVh0
+U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAJRSURBVBgZpcHda81xHMDx9+d3fudYzuYw
+2RaZ5yTWolEiuZpCSjGJFEktUUr8A6ZxQZGHmDtqdrGUXHgoeZqSp1F2bLFWjtkOB8PZzvmd7+dj
+v5XaBRfL6yVmxv+QjQeu7l25uuZYJmtxM0AVU8Wpw9RQU8w51AxzDqfKhFjwq6Mjdbj1RN0Zv2ZF
+zaloUdwrL2Is4r+y7hRwxs8G5mUzPxmrwcA8hvnmjIZtcxmr3Y09hHwzJZQvOAwwNZyCYqgaThVX
+MFzBCD7fJfv8MpHiKvaV3ePV2f07fMwIiSeIGeYJJoao4HmCiIeIQzPXifY+paJqO4lZi/nWPZ/k
+rabjvlNHyANMBAQiBiqgakQMCunbxHJviM9bQeZdBzHJUzKhguLJlQnf1BghAmZ4gImAgAjk++8j
+P56QmL2GXG8zsfFCz8skA1mQXKbaU3X8ISIgQsgDcun7FL7cJjFnLUMfLyLRr0SLS4hbhiup5Szd
+19rpFYKAESKICCERoS95neyHmyTmbmAodQ4vGpAfmEn6YTtTahv4ODiRkGdOCUUAAUSE/uQNfqTa
+KFu4jvynJiIxIzcwg/SjF1RsOk9R+QJMlZCvqvwhQFdbM4XvrynIVHpfn2ZSWYyhzHS+PUtSueUC
+0cQ0QmpGyE9197TUnwzq1DnUKbXSxOb6S7xtPkjngzbGVVbzvS/FjaGt9DU8xlRRJdTCMDEzRjuy
+Z1FwaFe9j+d4eecaPd1dPxNTSlfWHm1v5y/EzBitblXp4JLZ5f6yBbOwaK5tsD+9c33jq/f8w2+m
+RSjOllPhkAAAAABJRU5ErkJggg==`
+        )
+      ]
+    },
+    forms: { text: 'ie6 sucks :-/' }
+  }
+}
+
+const legacyBrowserTestCases = {
+  'firefox3-2png1txt': {
+    data: [
+      '-----------------------------186454651713519341951581030105\r\n',
+      'Content-Disposition: form-data; name="file1"; filename="anchor.png"\r\n',
+      'Content-Type: image/png\r\n',
+      '\r\n',
+      '[file1-data]\r\n',
+      '-----------------------------186454651713519341951581030105\r\n',
+      'Content-Disposition: form-data; name="file2"; filename="application_edit.png"\r\n',
+      'Content-Type: image/png\r\n',
+      '\r\n',
+      '[file2-data]\r\n',
+      '-----------------------------186454651713519341951581030105\r\n',
+      'Content-Disposition: form-data; name="text"\r\n',
+      '\r\n',
+      '[Text]\r\n',
+      '-----------------------------186454651713519341951581030105--\r\n'
+    ].join(''),
+    boundary: '---------------------------186454651713519341951581030105',
+    files: {
+      file1: ['anchor.png', 'image/png', '[file1-data]'],
+      file2: ['application_edit.png', 'image/png', '[file2-data]']
+    },
+    forms: { text: '[Text]' }
+  },
+  'opera8-2png1txt': {
+    data: [
+      '------------zEO9jQKmLc2Cq88c23Dx19\r\n',
+      'Content-Disposition: form-data; name="file1"; filename="arrow_branch.png"\r\n',
+      'Content-Type: image/png\r\n',
+      '\r\n',
+      '[file1-data]\r\n',
+      '------------zEO9jQKmLc2Cq88c23Dx19\r\n',
+      'Content-Disposition: form-data; name="file2"; filename="award_star_bronze_1.png"\r\n',
+      'Content-Type: image/png\r\n',
+      '\r\n',
+      '[file2-data]\r\n',
+      '------------zEO9jQKmLc2Cq88c23Dx19\r\n',
+      'Content-Disposition: form-data; name="text"\r\n',
+      '\r\n',
+      '[Text]\r\n',
+      '------------zEO9jQKmLc2Cq88c23Dx19--\r\n'
+    ].join(''),
+    boundary: '----------zEO9jQKmLc2Cq88c23Dx19',
+    files: {
+      file1: ['arrow_branch.png', 'image/png', '[file1-data]'],
+      file2: ['award_star_bronze_1.png', 'image/png', '[file2-data]']
+    },
+    forms: { text: '[Text]' }
+  },
+  'webkit3-2png1txt': {
+    data: [
+      '------WebKitFormBoundaryjdSFhcARk8fyGNy6\r\n',
+      'Content-Disposition: form-data; name="file1"; filename="gtk-apply.png"\r\n',
+      'Content-Type: image/png\r\n',
+      '\r\n',
+      '[file1-data]\r\n',
+      '------WebKitFormBoundaryjdSFhcARk8fyGNy6\r\n',
+      'Content-Disposition: form-data; name="file2"; filename="gtk-no.png"\r\n',
+      'Content-Type: image/png\r\n',
+      '\r\n',
+      '[file2-data]\r\n',
+      '------WebKitFormBoundaryjdSFhcARk8fyGNy6\r\n',
+      'Content-Disposition: form-data; name="text"\r\n',
+      '\r\n',
+      '[Text]\r\n',
+      '------WebKitFormBoundaryjdSFhcARk8fyGNy6--\r\n'
+    ].join(''),
+    boundary: '----WebKitFormBoundaryjdSFhcARk8fyGNy6',
+    files: {
+      file1: ['gtk-apply.png', 'image/png', '[file1-data]'],
+      file2: ['gtk-no.png', 'image/png', '[file2-data]']
+    },
+    forms: { text: '[Text]' }
+  },
+  'ie6-2png1txt': {
+    data: [
+      '-----------------------------7d91b03a20128\r\n',
+      'Content-Disposition: form-data; name="file1"; filename="C:\\Python25\\wztest\\werkzeug-main\\tests\\multipart\\firefox3-2png1txt\\file1.png"\r\n',
+      'Content-Type: image/x-png\r\n',
+      '\r\n',
+      '[file1-data]\r\n',
+      '-----------------------------7d91b03a20128\r\n',
+      'Content-Disposition: form-data; name="file2"; filename="C:\\Python25\\wztest\\werkzeug-main\\tests\\multipart\\firefox3-2png1txt\\file2.png"\r\n',
+      'Content-Type: image/x-png\r\n',
+      '\r\n',
+      '[file2-data]\r\n',
+      '-----------------------------7d91b03a20128\r\n',
+      'Content-Disposition: form-data; name="text"\r\n',
+      '\r\n',
+      '[Text]\r\n',
+      '-----------------------------7d91b03a20128--\r\n'
+    ].join(''),
+    boundary: '---------------------------7d91b03a20128',
+    files: {
+      file1: ['C:\\Python25\\wztest\\werkzeug-main\\tests\\multipart\\firefox3-2png1txt\\file1.png', 'image/x-png', '[file1-data]'],
+      file2: ['C:\\Python25\\wztest\\werkzeug-main\\tests\\multipart\\firefox3-2png1txt\\file2.png', 'image/x-png', '[file2-data]']
+    },
+    forms: { text: '[Text]' }
+  }
+}
+
+test('legacy tests', async (t) => {
+  for (const [name, body] of Object.entries(legacyTests)) {
+    await t.test(`parsing ${name}`, async (t) => {
+      const response = makeResponse(body.join(''), body[0].slice(2).trim())
+
+      await t.assert.doesNotReject(response.formData())
+    })
+  }
+})
+
+test('browser tests', async (t) => {
+  for (const [name, value] of Object.entries(browserTestCases)) {
+    await t.test(`parsing ${name}`, async (t) => {
+      const response = makeResponse(value.data, value.boundary)
+      const fd = await response.formData()
+
+      for (const [key, val] of fd.entries()) {
+        if (key in value.files) {
+          const [fileName, mimeType, body] = value.files[key]
+
+          t.assert.ok(val instanceof File)
+          t.assert.deepStrictEqual(fileName, val.name)
+          t.assert.deepStrictEqual(mimeType, val.type)
+          t.assert.deepStrictEqual(body, await val.text())
+        } else {
+          const expected = value.forms[key]
+          t.assert.deepStrictEqual(val, expected)
+        }
+      }
+    })
+  }
+})
+
+test('legacy browser tests', async (t) => {
+  for (const [name, value] of Object.entries(legacyBrowserTestCases)) {
+    await t.test(`parsing ${name}`, async (t) => {
+      const response = makeResponse(value.data, value.boundary)
+      const fd = await response.formData()
+
+      for (const [key, val] of fd.entries()) {
+        if (key in value.files) {
+          const [fileName, mimeType, body] = value.files[key]
+
+          t.assert.ok(val instanceof File)
+          t.assert.deepStrictEqual(fileName, val.name)
+          t.assert.deepStrictEqual(mimeType, val.type)
+          t.assert.deepStrictEqual(body, await val.text())
+        } else {
+          const expected = value.forms[key]
+          t.assert.deepStrictEqual(val, expected)
+        }
+      }
+    })
+  }
+})
diff --git a/test/web-platform-tests/expectation.json b/test/web-platform-tests/expectation.json
index 2d601880583..07b578e8e18 100644
--- a/test/web-platform-tests/expectation.json
+++ b/test/web-platform-tests/expectation.json
@@ -4808,8 +4808,7 @@
             },
             {
               "name": "Consume response's body: from text with correct multipart type to formData with BOM",
-              "success": false,
-              "message": "assert_equals: Retrieve and verify response's body expected \"--boundary-0.16075435275547334\\r\\nContent-Disposition: form-data;name=\\\"name\\\"\\r\\n\\r\\nquickfox\\r\\n--boundary-0.16075435275547334--\\r\\n\" but got \"--boundary-0.16075435275547334\\r\\nContent-Disposition: form-data;name=\\\"name\\\"\\r\\n\\r\\nquickfox\\r\\n--boundary-0.16075435275547334--\\r\\n\""
+              "success": true
             },
             {
               "name": "Consume response's body: from text without correct multipart type to formData (error case)",
@@ -4867,7 +4866,7 @@
             {
               "name": "Consume response's body: from FormData to blob",
               "success": false,
-              "message": "assert_equals: Blob body type should be computed from the response Content-Type expected \"multipart/form-data; boundary=----formdata-undici-035234180410\" but got \"multipart/form-data;boundary=----formdata-undici-035234180410\""
+              "message": "assert_equals: Blob body type should be computed from the response Content-Type expected \"multipart/form-data; boundary=----formdata-undici-084518311125\" but got \"multipart/form-data;boundary=----formdata-undici-084518311125\""
             },
             {
               "name": "Consume response's body: from FormData to text",