chore: use testcontext for busboy tests (#4572)

Author: Uzlopak

test/busboy/issue-3676.js

@@ -1,7 +1,6 @@
 'use strict'
 
 const { test } = require('node:test')
-const assert = require('node:assert')
 const { Response } = require('../..')
 
 // https://github.com/nodejs/undici/issues/3676
@@ -20,5 +19,5 @@ test('Leading and trailing CRLFs are ignored', async (t) => {
     }
   })
 
-  await assert.doesNotReject(response.formData())
+  await t.assert.doesNotReject(response.formData())
 })

test/busboy/issue-3760.js

@@ -1,7 +1,6 @@
 'use strict'
 
 const { test } = require('node:test')
-const assert = require('node:assert')
 const { Response } = require('../..')
 
 // https://github.com/nodejs/undici/issues/3760
@@ -21,10 +20,10 @@ test('filename* parameter is parsed properly', async (t) => {
   })
 
   const fd = await response.formData()
-  assert.deepEqual(fd.get('file').name, '€ rates')
+  t.assert.deepEqual(fd.get('file').name, '€ rates')
 })
 
-test('whitespace after filename[*]= is ignored', async () => {
+test('whitespace after filename[*]= is ignored', async (t) => {
   for (const response of [
     new Response([
       '--83d82e0d-9ced-44c0-ac79-4e66a827415b\r\n' +
@@ -54,6 +53,6 @@ test('whitespace after filename[*]= is ignored', async () => {
     })
   ]) {
     const fd = await response.formData()
-    assert.deepEqual(fd.get('file').name, 'hello')
+    t.assert.deepEqual(fd.get('file').name, 'hello')
   }
 })

test/busboy/test-types-multipart-charsets.js

@@ -1,6 +1,5 @@
 'use strict'
 
-const assert = require('node:assert')
 const { inspect } = require('node:util')
 const { test } = require('node:test')
 const { Response } = require('../..')
@@ -63,7 +62,7 @@ test('unicode filename', async (t) => {
     }
   }
 
-  assert.deepStrictEqual(
+  t.assert.deepStrictEqual(
     results,
     expected,
     'Results mismatch.\n' +

test/busboy/test-types-multipart.js

@@ -1,8 +1,7 @@
 'use strict'
 
-const assert = require('node:assert')
 const { inspect } = require('node:util')
-const { describe } = require('node:test')
+const { test } = require('node:test')
 const { Response } = require('../..')
 
 const active = new Map()
@@ -563,7 +562,7 @@ const tests = [
   }
 ]
 
-describe('FormData parsing tests', async (t) => {
+test('FormData parsing tests', async (t) => {
   for (const test of tests) {
     active.set(test, 1)
 
@@ -618,7 +617,7 @@ describe('FormData parsing tests', async (t) => {
 
     active.delete(test)
 
-    assert.deepStrictEqual(
+    t.assert.deepStrictEqual(
       results,
       test.expected,
       `[${what}] Results mismatch.\n` +