test: remove need to make fs call for zlib test

test/parallel/test-zlib-flush.js

@@ -1,36 +1,38 @@
 'use strict';
+
 require('../common');
-const assert = require('assert');
-const zlib = require('zlib');
-const fixtures = require('../common/fixtures');
 
-const file = fixtures.readSync('person.jpg');
-const chunkSize = 16;
-const opts = { level: 0 };
-const deflater = zlib.createDeflate(opts);
+const assert = require('node:assert');
+const zlib = require('node:zlib');
+const { test } = require('node:test');
+
+test('zlib flush', async () => {
+ const { promise, resolve } = Promise.withResolvers();
 
-const chunk = file.slice(0, chunkSize);
-const expectedNone = Buffer.from([0x78, 0x01]);
-const blkhdr = Buffer.from([0x00, 0x10, 0x00, 0xef, 0xff]);
-const adler32 = Buffer.from([0x00, 0x00, 0x00, 0xff, 0xff]);
-const expectedFull = Buffer.concat([blkhdr, chunk, adler32]);
-let actualNone;
-let actualFull;
+ const opts = { level: 0 };
+ const deflater = zlib.createDeflate(opts);
+ const chunk = Buffer.from('/9j/4AAQSkZJRgABAQEASA==', 'base64');
+ const expectedNone = Buffer.from([0x78, 0x01]);
+ const blkhdr = Buffer.from([0x00, 0x10, 0x00, 0xef, 0xff]);
+ const adler32 = Buffer.from([0x00, 0x00, 0x00, 0xff, 0xff]);
+ const expectedFull = Buffer.concat([blkhdr, chunk, adler32]);
+ let actualNone;
+ let actualFull;
 
-deflater.write(chunk, function() {
- deflater.flush(zlib.constants.Z_NO_FLUSH, function() {
- actualNone = deflater.read();
- deflater.flush(function() {
- const bufs = [];
- let buf;
- while ((buf = deflater.read()) !== null)
- bufs.push(buf);
- actualFull = Buffer.concat(bufs);
+ deflater.write(chunk, function() {
+ deflater.flush(zlib.constants.Z_NO_FLUSH, function() {
+ actualNone = deflater.read();
+ deflater.flush(function() {
+ const bufs = [];
+ let buf;
+ while ((buf = deflater.read()) !== null)
+ bufs.push(buf);
+ actualFull = Buffer.concat(bufs);
+ resolve();
+ });
  });
  });
-});
-
-process.once('exit', function() {
+ await promise;
  assert.deepStrictEqual(actualNone, expectedNone);
  assert.deepStrictEqual(actualFull, expectedFull);
 });