diff --git a/test/eslint.config_partial.mjs b/test/eslint.config_partial.mjs
index d19e98a4bf3131..c5f6b06c02a01b 100644
--- a/test/eslint.config_partial.mjs
+++ b/test/eslint.config_partial.mjs
@@ -190,6 +190,10 @@ export default [
         'wasm-allocation',
         'wpt',
       ].join(',')}}/**/*.{js,mjs,cjs}`,
+      `test/parallel/test-{${
+        // 0x61 is code for 'a', this generates a string enumerating latin letters: 'z*,y*,…'
+        Array.from({ length: 2 }, (_, i) => String.fromCharCode(0x61 + 25 - i, 42)).join(',')
+      }}.{js,mjs,cjs}`,
     ],
     rules: {
       'node-core/must-call-assert': 'error',
diff --git a/test/parallel/test-zlib-brotli-16GB.js b/test/parallel/test-zlib-brotli-16GB.js
index 9b894320e91ebd..7bd5a137f908fd 100644
--- a/test/parallel/test-zlib-brotli-16GB.js
+++ b/test/parallel/test-zlib-brotli-16GB.js
@@ -2,7 +2,7 @@
 
 const common = require('../common');
 const { createBrotliDecompress } = require('node:zlib');
-const strictEqual = require('node:assert').strictEqual;
+const assert = require('node:assert');
 const { getDefaultHighWaterMark } = require('stream');
 
 // This tiny HEX string is a 16GB file.
@@ -19,5 +19,5 @@ decoder.end(buf);
 // to process the data and the buffer is not empty.
 setTimeout(common.mustCall(() => {
   // There is only one chunk in the buffer
-  strictEqual(decoder._readableState.buffer.length, getDefaultHighWaterMark() / (16 * 1024));
+  assert.strictEqual(decoder._readableState.buffer.length, getDefaultHighWaterMark() / (16 * 1024));
 }), common.platformTimeout(500));
diff --git a/test/parallel/test-zlib-brotli-kmaxlength-rangeerror.js b/test/parallel/test-zlib-brotli-kmaxlength-rangeerror.js
index 6a59ad34b0a174..69f23542cb9ac0 100644
--- a/test/parallel/test-zlib-brotli-kmaxlength-rangeerror.js
+++ b/test/parallel/test-zlib-brotli-kmaxlength-rangeerror.js
@@ -1,5 +1,5 @@
 'use strict';
-require('../common');
+const common = require('../common');
 
 // This test ensures that zlib throws a RangeError if the final buffer needs to
 // be larger than kMaxLength and concatenation fails.
@@ -18,9 +18,9 @@ buffer.kMaxLength = oldkMaxLength;
 const encoded = Buffer.from('G38A+CXCIrFAIAM=', 'base64');
 
 // Async
-zlib.brotliDecompress(encoded, function(err) {
+zlib.brotliDecompress(encoded, common.mustCall((err) => {
   assert.ok(err instanceof RangeError);
-});
+}));
 
 // Sync
 assert.throws(function() {
diff --git a/test/parallel/test-zlib-from-concatenated-gzip.js b/test/parallel/test-zlib-from-concatenated-gzip.js
index 1de36dacf95f3d..31985aa2bbe791 100644
--- a/test/parallel/test-zlib-from-concatenated-gzip.js
+++ b/test/parallel/test-zlib-from-concatenated-gzip.js
@@ -47,9 +47,7 @@ const pmmResultBuffers = [];
 
 fs.createReadStream(pmmFileGz)
   .pipe(zlib.createGunzip())
-  .on('error', (err) => {
-    assert.ifError(err);
-  })
+  .on('error', common.mustNotCall())
   .on('data', (data) => pmmResultBuffers.push(data))
   .on('finish', common.mustCall(() => {
     // Result should match original random garbage
@@ -61,9 +59,7 @@ fs.createReadStream(pmmFileGz)
   const resultBuffers = [];
 
   const unzip = zlib.createGunzip()
-    .on('error', (err) => {
-      assert.ifError(err);
-    })
+    .on('error', common.mustNotCall())
     .on('data', (data) => resultBuffers.push(data))
     .on('finish', common.mustCall(() => {
       assert.strictEqual(
diff --git a/test/parallel/test-zlib-kmaxlength-rangeerror.js b/test/parallel/test-zlib-kmaxlength-rangeerror.js
index 9803630214eb36..bae49a6530a902 100644
--- a/test/parallel/test-zlib-kmaxlength-rangeerror.js
+++ b/test/parallel/test-zlib-kmaxlength-rangeerror.js
@@ -1,5 +1,5 @@
 'use strict';
-require('../common');
+const common = require('../common');
 
 // This test ensures that zlib throws a RangeError if the final buffer needs to
 // be larger than kMaxLength and concatenation fails.
@@ -18,9 +18,9 @@ buffer.kMaxLength = oldkMaxLength;
 const encoded = Buffer.from('H4sIAAAAAAAAA0tMHFgAAIw2K/GAAAAA', 'base64');
 
 // Async
-zlib.gunzip(encoded, function(err) {
+zlib.gunzip(encoded, common.mustCall((err) => {
   assert.ok(err instanceof RangeError);
-});
+}));
 
 // Sync
 assert.throws(function() {
diff --git a/test/parallel/test-zlib-maxOutputLength.js b/test/parallel/test-zlib-maxOutputLength.js
index 9af0b3736f8815..ec293aabe7fc04 100644
--- a/test/parallel/test-zlib-maxOutputLength.js
+++ b/test/parallel/test-zlib-maxOutputLength.js
@@ -17,9 +17,7 @@ assert.throws(function() {
 }, RangeError);
 
 // Async
-zlib.brotliDecompress(encoded, { maxOutputLength: 256 }, function(err) {
-  assert.strictEqual(err, null);
-});
+zlib.brotliDecompress(encoded, { maxOutputLength: 256 }, common.mustSucceed());
 
 // Sync
 zlib.brotliDecompressSync(encoded, { maxOutputLength: 256 });
diff --git a/test/parallel/test-zlib-reset-before-write.js b/test/parallel/test-zlib-reset-before-write.js
index afa207f12c1b30..05c1cdce2c4972 100644
--- a/test/parallel/test-zlib-reset-before-write.js
+++ b/test/parallel/test-zlib-reset-before-write.js
@@ -21,9 +21,7 @@ for (const fn of [
 
   const output = [];
   inflate
-    .on('error', (err) => {
-      assert.ifError(err);
-    })
+    .on('error', common.mustNotCall())
     .on('data', (chunk) => output.push(chunk))
     .on('end', common.mustCall(
       () => assert.strictEqual(Buffer.concat(output).toString(), 'abc')));
diff --git a/test/parallel/test-zlib-truncated.js b/test/parallel/test-zlib-truncated.js
index 94bc0e21cb7a5f..c489388a674e52 100644
--- a/test/parallel/test-zlib-truncated.js
+++ b/test/parallel/test-zlib-truncated.js
@@ -1,7 +1,7 @@
 'use strict';
 // Tests zlib streams with truncated compressed input
 
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const zlib = require('zlib');
 
@@ -23,8 +23,7 @@ const errMessage = /unexpected end of file/;
   { comp: 'deflate', decomp: 'inflate', decompSync: 'inflateSync' },
   { comp: 'deflateRaw', decomp: 'inflateRaw', decompSync: 'inflateRawSync' },
 ].forEach(function(methods) {
-  zlib[methods.comp](inputString, function(err, compressed) {
-    assert.ifError(err);
+  zlib[methods.comp](inputString, common.mustSucceed((compressed) => {
     const truncated = compressed.slice(0, compressed.length / 2);
     const toUTF8 = (buffer) => buffer.toString('utf-8');
 
@@ -33,10 +32,9 @@ const errMessage = /unexpected end of file/;
     assert.strictEqual(toUTF8(decompressed), inputString);
 
     // async sanity
-    zlib[methods.decomp](compressed, function(err, result) {
-      assert.ifError(err);
+    zlib[methods.decomp](compressed, common.mustSucceed((result) => {
       assert.strictEqual(toUTF8(result), inputString);
-    });
+    }));
 
     // Sync truncated input test
     assert.throws(function() {
@@ -44,9 +42,9 @@ const errMessage = /unexpected end of file/;
     }, errMessage);
 
     // Async truncated input test
-    zlib[methods.decomp](truncated, function(err, result) {
+    zlib[methods.decomp](truncated, common.mustCall((err) => {
       assert.match(err.message, errMessage);
-    });
+    }));
 
     const syncFlushOpt = { finishFlush: zlib.constants.Z_SYNC_FLUSH };
 
@@ -55,10 +53,9 @@ const errMessage = /unexpected end of file/;
     assert.strictEqual(result, inputString.slice(0, result.length));
 
     // Async truncated input test, finishFlush = Z_SYNC_FLUSH
-    zlib[methods.decomp](truncated, syncFlushOpt, function(err, decompressed) {
-      assert.ifError(err);
+    zlib[methods.decomp](truncated, syncFlushOpt, common.mustSucceed((decompressed) => {
       const result = toUTF8(decompressed);
       assert.strictEqual(result, inputString.slice(0, result.length));
-    });
-  });
+    }));
+  }));
 });
diff --git a/test/parallel/test-zlib-type-error.js b/test/parallel/test-zlib-type-error.js
index 3432d75e346ef1..912b59fd9ca923 100644
--- a/test/parallel/test-zlib-type-error.js
+++ b/test/parallel/test-zlib-type-error.js
@@ -1,20 +1,9 @@
 'use strict';
 require('../common');
-const assert = require('assert').strict;
+const assert = require('assert');
 const test = require('node:test');
 const { DecompressionStream } = require('stream/web');
 
-async function expectTypeError(promise) {
-  let threw = false;
-  try {
-    await promise;
-  } catch (err) {
-    threw = true;
-    assert(err instanceof TypeError, `Expected TypeError, got ${err}`);
-  }
-  assert(threw, 'Expected promise to reject');
-}
-
 test('DecompressStream deflat emits error on trailing data', async () => {
   const valid = new Uint8Array([120, 156, 75, 4, 0, 0, 98, 0, 98]); // deflate('a')
   const empty = new Uint8Array(1);
@@ -22,10 +11,11 @@ test('DecompressStream deflat emits error on trailing data', async () => {
   const double = new Uint8Array([...valid, ...valid]);
 
   for (const chunk of [[invalid], [valid, empty], [valid, valid], [valid, double]]) {
-    await expectTypeError(
+    await assert.rejects(
       Array.fromAsync(
         new Blob([chunk]).stream().pipeThrough(new DecompressionStream('deflate'))
-      )
+      ),
+      { name: 'TypeError' },
     );
   }
 });
@@ -37,10 +27,11 @@ test('DecompressStream gzip emits error on trailing data', async () => {
   const invalid = new Uint8Array([...valid, ...empty]);
   const double = new Uint8Array([...valid, ...valid]);
   for (const chunk of [[invalid], [valid, empty], [valid, valid], [double]]) {
-    await expectTypeError(
+    await assert.rejects(
       Array.fromAsync(
         new Blob([chunk]).stream().pipeThrough(new DecompressionStream('gzip'))
-      )
+      ),
+      { name: 'TypeError' },
     );
   }
 });
diff --git a/test/parallel/test-zlib-unzip-one-byte-chunks.js b/test/parallel/test-zlib-unzip-one-byte-chunks.js
index b379584a0438ec..8fb8bcd39a7a28 100644
--- a/test/parallel/test-zlib-unzip-one-byte-chunks.js
+++ b/test/parallel/test-zlib-unzip-one-byte-chunks.js
@@ -1,38 +1,30 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
 
 const assert = require('node:assert');
 const zlib = require('node:zlib');
-const { test } = require('node:test');
 
-test('zlib should unzip one byte chunks', async () => {
-  const { promise, resolve } = Promise.withResolvers();
-  const data = Buffer.concat([
-    zlib.gzipSync('abc'),
-    zlib.gzipSync('def'),
-  ]);
+const data = Buffer.concat([
+  zlib.gzipSync('abc'),
+  zlib.gzipSync('def'),
+]);
 
-  const resultBuffers = [];
+const resultBuffers = [];
 
-  const unzip = zlib.createUnzip()
-    .on('error', (err) => {
-      assert.ifError(err);
-    })
-    .on('data', (data) => resultBuffers.push(data))
-    .on('finish', () => {
-      const unzipped = Buffer.concat(resultBuffers).toString();
-      assert.strictEqual(unzipped, 'abcdef',
-                         `'${unzipped}' should match 'abcdef' after zipping ` +
-        'and unzipping');
-      resolve();
-    });
+const unzip = zlib.createUnzip()
+  .on('error', common.mustNotCall())
+  .on('data', (data) => resultBuffers.push(data))
+  .on('finish', common.mustCall(() => {
+    const unzipped = Buffer.concat(resultBuffers).toString();
+    assert.strictEqual(unzipped, 'abcdef',
+                       `'${unzipped}' should match 'abcdef' after zipping ` +
+      'and unzipping');
+  }));
 
-  for (let i = 0; i < data.length; i++) {
-    // Write each single byte individually.
-    unzip.write(Buffer.from([data[i]]));
-  }
+for (let i = 0; i < data.length; i++) {
+  // Write each single byte individually.
+  unzip.write(Buffer.from([data[i]]));
+}
 
-  unzip.end();
-  await promise;
-});
+unzip.end();
diff --git a/test/parallel/test-zlib-write-after-close.js b/test/parallel/test-zlib-write-after-close.js
index 2d5d4965b0fec4..6b2b1c8cd0172b 100644
--- a/test/parallel/test-zlib-write-after-close.js
+++ b/test/parallel/test-zlib-write-after-close.js
@@ -21,25 +21,17 @@
 
 'use strict';
 
-require('../common');
+const common = require('../common');
 
 const zlib = require('node:zlib');
 const assert = require('node:assert');
-const { test } = require('node:test');
 
-test('zlib should not allow writing after close', async (t) => {
-  const { promise, resolve } = Promise.withResolvers();
-  const closeCallback = t.mock.fn();
-  zlib.gzip('hello', function() {
-    const unzip = zlib.createGunzip();
-    unzip.close(closeCallback);
-    unzip.write('asd', function(err) {
-      assert.strictEqual(err.code, 'ERR_STREAM_DESTROYED');
-      assert.strictEqual(err.name, 'Error');
-      assert.strictEqual(err.message, 'Cannot call write after a stream was destroyed');
-      resolve();
-    });
-  });
-  await promise;
-  assert.strictEqual(closeCallback.mock.callCount(), 1);
-});
+zlib.gzip('hello', common.mustCall(() => {
+  const unzip = zlib.createGunzip();
+  unzip.close(common.mustCall());
+  unzip.write('asd', common.mustCall((err) => {
+    assert.strictEqual(err.code, 'ERR_STREAM_DESTROYED');
+    assert.strictEqual(err.name, 'Error');
+    assert.strictEqual(err.message, 'Cannot call write after a stream was destroyed');
+  }));
+}));
diff --git a/test/parallel/test-zlib-write-after-flush.js b/test/parallel/test-zlib-write-after-flush.js
index fbe7c9859ea9fe..9449ab46823b80 100644
--- a/test/parallel/test-zlib-write-after-flush.js
+++ b/test/parallel/test-zlib-write-after-flush.js
@@ -21,39 +21,33 @@
 
 'use strict';
 
-require('../common');
+const common = require('../common');
 
 const assert = require('node:assert');
 const zlib = require('node:zlib');
-const { test } = require('node:test');
 
-test('zlib should accept writing after flush', async () => {
-  for (const [ createCompress, createDecompress ] of [
-    [ zlib.createGzip, zlib.createGunzip ],
-    [ zlib.createBrotliCompress, zlib.createBrotliDecompress ],
-    [ zlib.createZstdCompress, zlib.createZstdDecompress ],
-  ]) {
-    const { promise, resolve, reject } = Promise.withResolvers();
-    const gzip = createCompress();
-    const gunz = createDecompress();
+for (const [ createCompress, createDecompress ] of [
+  [ zlib.createGzip, zlib.createGunzip ],
+  [ zlib.createBrotliCompress, zlib.createBrotliDecompress ],
+  [ zlib.createZstdCompress, zlib.createZstdDecompress ],
+]) {
+  const gzip = createCompress();
+  const gunz = createDecompress();
 
-    gzip.pipe(gunz);
+  gzip.pipe(gunz);
 
-    let output = '';
-    const input = 'A line of data\n';
-    gunz.setEncoding('utf8');
-    gunz.on('error', reject);
-    gunz.on('data', (c) => output += c);
-    gunz.on('end', () => {
-      assert.strictEqual(output, input);
-      resolve();
-    });
+  let output = '';
+  const input = 'A line of data\n';
+  gunz.setEncoding('utf8');
+  gunz.on('error', common.mustNotCall());
+  gunz.on('data', (c) => output += c);
+  gunz.on('end', common.mustCall(() => {
+    assert.strictEqual(output, input);
+  }));
 
-    // Make sure that flush/write doesn't trigger an assert failure
-    gzip.flush();
-    gzip.write(input);
-    gzip.end();
-    gunz.read(0);
-    await promise;
-  }
-});
+  // Make sure that flush/write doesn't trigger an assert failure
+  gzip.flush();
+  gzip.write(input);
+  gzip.end();
+  gunz.read(0);
+}
diff --git a/test/parallel/test-zlib-zero-byte.js b/test/parallel/test-zlib-zero-byte.js
index a6120d4b92ed29..c3e56bd180ec93 100644
--- a/test/parallel/test-zlib-zero-byte.js
+++ b/test/parallel/test-zlib-zero-byte.js
@@ -21,35 +21,29 @@
 
 'use strict';
 
-require('../common');
+const common = require('../common');
 
 const assert = require('node:assert');
 const zlib = require('node:zlib');
-const { test } = require('node:test');
 
-test('zlib should properly handle zero byte input', async () => {
-  const compressors = [
-    [zlib.Gzip, 20],
-    [zlib.BrotliCompress, 1],
-    [zlib.ZstdCompress, 9],
-  ];
+const compressors = [
+  [zlib.Gzip, 20],
+  [zlib.BrotliCompress, 1],
+  [zlib.ZstdCompress, 9],
+];
 
-  for (const [Compressor, expected] of compressors) {
-    const { promise, resolve, reject } = Promise.withResolvers();
-    const gz = new Compressor();
-    const emptyBuffer = Buffer.alloc(0);
-    let received = 0;
-    gz.on('data', function(c) {
-      received += c.length;
-    });
-    gz.on('error', reject);
-    gz.on('end', function() {
-      assert.strictEqual(received, expected,
-                         `${received}, ${expected}, ${Compressor.name}`);
-      resolve();
-    });
-    gz.write(emptyBuffer);
-    gz.end();
-    await promise;
-  }
-});
+for (const [Compressor, expected] of compressors) {
+  const gz = new Compressor();
+  const emptyBuffer = Buffer.alloc(0);
+  let received = 0;
+  gz.on('data', function(c) {
+    received += c.length;
+  });
+  gz.on('error', common.mustNotCall());
+  gz.on('end', common.mustCall(() => {
+    assert.strictEqual(received, expected,
+                       `${received}, ${expected}, ${Compressor.name}`);
+  }));
+  gz.write(emptyBuffer);
+  gz.end();
+}
diff --git a/test/parallel/test-zlib-zstd-kmaxlength-rangeerror.js b/test/parallel/test-zlib-zstd-kmaxlength-rangeerror.js
index 58ad8ff2c98dea..4537f16370148a 100644
--- a/test/parallel/test-zlib-zstd-kmaxlength-rangeerror.js
+++ b/test/parallel/test-zlib-zstd-kmaxlength-rangeerror.js
@@ -1,5 +1,5 @@
 'use strict';
-require('../common');
+const common = require('../common');
 
 // This test ensures that zlib throws a RangeError if the final buffer needs to
 // be larger than kMaxLength and concatenation fails.
@@ -19,9 +19,9 @@ buffer.kMaxLength = oldkMaxLength;
 const encoded = Buffer.from('KLUv/SCARQAAEGFhAQA7BVg=', 'base64');
 
 // Async
-zlib.zstdDecompress(encoded, function(err) {
+zlib.zstdDecompress(encoded, common.mustCall((err) => {
   assert.ok(err instanceof RangeError);
-});
+}));
 
 // Sync
 assert.throws(function() {