diff --git a/test/eslint.config_partial.mjs b/test/eslint.config_partial.mjs
index f523d6f86f..d19e98a4bf 100644
--- a/test/eslint.config_partial.mjs
+++ b/test/eslint.config_partial.mjs
@@ -178,6 +178,7 @@ export default [
         'pummel',
         'report',
         'sea',
+        'sequential',
         'sqlite',
         'system-ca',
         'test426',
diff --git a/test/sequential/test-child-process-execsync.js b/test/sequential/test-child-process-execsync.js
index 53ee42b214..ed7f78d421 100644
--- a/test/sequential/test-child-process-execsync.js
+++ b/test/sequential/test-child-process-execsync.js
@@ -147,9 +147,9 @@ const args = [
     assert.strictEqual(typeof err.pid, 'number');
     spawnSyncKeys
       .filter((key) => key !== 'pid')
-      .forEach((key) => {
+      .forEach(common.mustCallAtLeast((key) => {
         assert.deepStrictEqual(err[key], spawnSyncResult[key]);
-      });
+      }));
     return true;
   });
 }
diff --git a/test/sequential/test-child-process-pass-fd.js b/test/sequential/test-child-process-pass-fd.js
index 0a77aca0f4..9b62c3edb3 100644
--- a/test/sequential/test-child-process-pass-fd.js
+++ b/test/sequential/test-child-process-pass-fd.js
@@ -21,7 +21,7 @@ const N = 80;
 let messageCallbackCount = 0;
 
 function forkWorker() {
-  const messageCallback = (msg, handle) => {
+  const messageCallback = common.mustCall((msg, handle) => {
     messageCallbackCount++;
     assert.strictEqual(msg, 'handle');
     assert.ok(handle);
@@ -32,11 +32,11 @@ function forkWorker() {
       recvData += data;
     }));
 
-    handle.on('end', () => {
+    handle.on('end', common.mustCall(() => {
       assert.strictEqual(recvData, 'hello');
       worker.kill();
-    });
-  };
+    }));
+  });
 
   const worker = fork(__filename, ['child']);
   worker.on('error', (err) => {
@@ -70,13 +70,13 @@ if (process.argv[2] !== 'child') {
   // thus no work to do, and will exit immediately, preventing process leaks.
   process.on('message', common.mustCall());
 
-  const server = net.createServer((c) => {
-    process.once('message', (msg) => {
+  const server = net.createServer(common.mustCall((c) => {
+    process.once('message', common.mustCall((msg) => {
       assert.strictEqual(msg, 'got');
       c.end('hello');
-    });
+    }));
     socketConnected();
-  }).unref();
+  })).unref();
   server.listen(0, common.localhostIPv4, () => {
     const { port } = server.address();
     socket = net.connect(port, common.localhostIPv4, socketConnected).unref();
diff --git a/test/sequential/test-cluster-send-handle-large-payload.js b/test/sequential/test-cluster-send-handle-large-payload.js
index c5226ceb40..81e4f79781 100644
--- a/test/sequential/test-cluster-send-handle-large-payload.js
+++ b/test/sequential/test-cluster-send-handle-large-payload.js
@@ -23,10 +23,9 @@ if (cluster.isPrimary) {
   server.listen(0, common.mustCall(() => {
     const port = server.address().port;
     const socket = new net.Socket();
-    socket.connect(port, (err) => {
-      assert.ifError(err);
+    socket.connect(port, common.mustSucceed(() => {
       worker.send({ payload }, socket);
-    });
+    }));
   }));
 } else {
   process.on('message', common.mustCall(({ payload: received }, handle) => {
diff --git a/test/sequential/test-debugger-pid.js b/test/sequential/test-debugger-pid.js
index 972c8448bc..97218b796c 100644
--- a/test/sequential/test-debugger-pid.js
+++ b/test/sequential/test-debugger-pid.js
@@ -11,7 +11,7 @@ const { spawn } = require('child_process');
 
 const script = fixtures.path('debugger', 'alive.js');
 
-const runTest = async () => {
+(async () => {
   const target = spawn(process.execPath, [script]);
   const cli = startCLI(['-p', `${target.pid}`], [], {}, { randomPort: false });
 
@@ -24,12 +24,8 @@ const runTest = async () => {
       cli.output,
       /> 3 {3}\+\+x;/,
       'marks the 3rd line');
-  } catch (error) {
-    assert.ifError(error);
   } finally {
     await cli.quit();
     target.kill();
   }
-};
-
-runTest().then(common.mustCall());
+})().then(common.mustCall());
diff --git a/test/sequential/test-deprecation-flags.js b/test/sequential/test-deprecation-flags.js
index 30ac4a605e..0cbc0a6cde 100644
--- a/test/sequential/test-deprecation-flags.js
+++ b/test/sequential/test-deprecation-flags.js
@@ -20,7 +20,7 @@
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 'use strict';
-require('../common');
+const common = require('../common');
 const fixtures = require('../common/fixtures');
 const assert = require('assert');
 const execFile = require('child_process').execFile;
@@ -40,49 +40,43 @@ const normal = [depmod];
 const noDep = ['--no-deprecation', depmod];
 const traceDep = ['--trace-deprecation', depmod];
 
-execFile(node, normal, function(er, stdout, stderr) {
+execFile(node, normal, common.mustSucceed((stdout, stderr) => {
   console.error('normal: show deprecation warning');
-  assert.strictEqual(er, null);
   assert.strictEqual(stdout, '');
   assert.match(stderr, /this function is deprecated/);
   console.log('normal ok');
-});
+}));
 
-execFile(node, noDep, function(er, stdout, stderr) {
+execFile(node, noDep, common.mustSucceed((stdout, stderr) => {
   console.error('--no-deprecation: silence deprecations');
-  assert.strictEqual(er, null);
   assert.strictEqual(stdout, '');
   assert.strictEqual(stderr.trim(), 'This is deprecated');
   console.log('silent ok');
-});
+}));
 
-execFile(node, traceDep, function(er, stdout, stderr) {
+execFile(node, traceDep, common.mustSucceed((stdout, stderr) => {
   console.error('--trace-deprecation: show stack');
-  assert.strictEqual(er, null);
   assert.strictEqual(stdout, '');
   const stack = stderr.trim().split('\n');
   // Just check the top and bottom.
   assert.match(stack[1], /this function is deprecated/);
   assert.match(stack[0], /This is deprecated/);
   console.log('trace ok');
-});
+}));
 
-execFile(node, [depUserlandFunction], function(er, stdout, stderr) {
+execFile(node, [depUserlandFunction], common.mustSucceed((stdout, stderr) => {
   console.error('normal: testing deprecated userland function');
-  assert.strictEqual(er, null);
   assert.strictEqual(stdout, '');
   assert.match(stderr, /deprecatedFunction is deprecated/);
   console.error('normal: ok');
-});
+}));
 
-execFile(node, [depUserlandClass], function(er, stdout, stderr) {
-  assert.strictEqual(er, null);
+execFile(node, [depUserlandClass], common.mustSucceed((stdout, stderr) => {
   assert.strictEqual(stdout, '');
   assert.match(stderr, /deprecatedClass is deprecated/);
-});
+}));
 
-execFile(node, [depUserlandSubClass], function(er, stdout, stderr) {
-  assert.strictEqual(er, null);
+execFile(node, [depUserlandSubClass], common.mustSucceed((stdout, stderr) => {
   assert.strictEqual(stdout, '');
   assert.match(stderr, /deprecatedClass is deprecated/);
-});
+}));
diff --git a/test/sequential/test-dgram-pingpong.js b/test/sequential/test-dgram-pingpong.js
index 33b01fbe22..87118ae85b 100644
--- a/test/sequential/test-dgram-pingpong.js
+++ b/test/sequential/test-dgram-pingpong.js
@@ -14,17 +14,17 @@ function pingPongTest(port, host) {
     throw e;
   });
 
-  server.on('listening', function() {
+  server.on('listening', common.mustCall(() => {
     console.log(`server listening on ${port}`);
 
     const client = dgram.createSocket('udp4');
 
-    client.on('message', function(msg) {
+    client.on('message', common.mustCall((msg) => {
       assert.strictEqual(msg.toString('ascii'), 'PONG');
 
       client.close();
       server.close();
-    });
+    }));
 
     client.on('error', function(e) {
       throw e;
@@ -37,7 +37,7 @@ function pingPongTest(port, host) {
     }
 
     clientSend();
-  });
+  }));
   server.bind(port, host);
   return server;
 }
diff --git a/test/sequential/test-fs-readdir-recursive.js b/test/sequential/test-fs-readdir-recursive.js
index 0b2da41969..15bc75c6c9 100644
--- a/test/sequential/test-fs-readdir-recursive.js
+++ b/test/sequential/test-fs-readdir-recursive.js
@@ -134,11 +134,11 @@ function assertDirents(dirents) {
   assert.strictEqual(dirents.length, expected.length);
   dirents.sort((a, b) => (getDirentPath(a) < getDirentPath(b) ? -1 : 1));
   assert.deepStrictEqual(
-    dirents.map((dirent) => {
+    dirents.map(common.mustCallAtLeast((dirent) => {
       assert(dirent instanceof fs.Dirent);
       assert.notStrictEqual(dirent.name, undefined);
       return getDirentPath(dirent);
-    }),
+    })),
     expected
   );
 }
diff --git a/test/sequential/test-heapdump-flag-custom-dir.js b/test/sequential/test-heapdump-flag-custom-dir.js
index ea53cb6604..ece1f5b92b 100644
--- a/test/sequential/test-heapdump-flag-custom-dir.js
+++ b/test/sequential/test-heapdump-flag-custom-dir.js
@@ -7,7 +7,7 @@ if (common.isWindows)
 
 const assert = require('assert');
 
-const validateHeapSnapshotFile = () => {
+if (process.argv[2] === 'child') {
   const fs = require('fs');
 
   assert.strictEqual(process.listenerCount('SIGUSR2'), 1);
@@ -31,10 +31,6 @@ const validateHeapSnapshotFile = () => {
       JSON.parse(fs.readFileSync(files[i]));
     }
   })();
-};
-
-if (process.argv[2] === 'child') {
-  validateHeapSnapshotFile();
 } else {
   // Modify the timezone. So we can check the file date string still returning correctly.
   process.env.TZ = 'America/New_York';
diff --git a/test/sequential/test-http-econnrefused.js b/test/sequential/test-http-econnrefused.js
index 4d0f7a174e..e326357a51 100644
--- a/test/sequential/test-http-econnrefused.js
+++ b/test/sequential/test-http-econnrefused.js
@@ -32,7 +32,7 @@ const common = require('../common');
 const http = require('http');
 const assert = require('assert');
 
-const server = http.createServer(function(req, res) {
+const server = http.createServer(common.mustCallAtLeast((req, res) => {
   let body = '';
 
   req.setEncoding('utf8');
@@ -40,12 +40,12 @@ const server = http.createServer(function(req, res) {
     body += chunk;
   });
 
-  req.on('end', function() {
+  req.on('end', common.mustCall(() => {
     assert.strictEqual(body, 'PING');
     res.writeHead(200, { 'Connection': 'close' });
     res.end('PONG');
-  });
-});
+  }));
+}));
 
 
 server.on('listening', pingping);
@@ -109,7 +109,7 @@ function ping() {
     method: 'POST'
   };
 
-  const req = http.request(opt, function(res) {
+  const req = http.request(opt, common.mustCallAtLeast((res) => {
     let body = '';
 
     res.setEncoding('utf8');
@@ -117,20 +117,20 @@ function ping() {
       body += chunk;
     });
 
-    res.on('end', function() {
+    res.on('end', common.mustCall(() => {
       assert.strictEqual(body, 'PONG');
       assert.ok(!hadError);
       gotEnd = true;
       afterPing('success');
-    });
-  });
+    }));
+  }, 0));
 
   req.end('PING');
 
   let gotEnd = false;
   let hadError = false;
 
-  req.on('error', function(error) {
+  req.on('error', common.mustCallAtLeast((error) => {
     console.log(`Error making ping req: ${error}`);
     hadError = true;
     assert.ok(!gotEnd);
@@ -138,7 +138,7 @@ function ping() {
     // Family autoselection might be skipped if only a single address is returned by DNS.
     const actualError = Array.isArray(error.errors) ? error.errors[0] : error;
     afterPing(actualError.message);
-  });
+  }, 0));
 }
 
 
diff --git a/test/sequential/test-http-keepalive-maxsockets.js b/test/sequential/test-http-keepalive-maxsockets.js
index 9c98a140f6..a9775e88ad 100644
--- a/test/sequential/test-http-keepalive-maxsockets.js
+++ b/test/sequential/test-http-keepalive-maxsockets.js
@@ -20,7 +20,7 @@
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 'use strict';
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 
 const http = require('http');
@@ -33,7 +33,7 @@ const server = http.createServer(function(req, res) {
   }
   res.end(req.url);
 });
-server.listen(0, function() {
+server.listen(0, common.mustCall(() => {
   const agent = http.Agent({
     keepAlive: true,
     maxSockets: 5,
@@ -41,16 +41,14 @@ server.listen(0, function() {
   });
 
   let closed = false;
-  makeReqs(10, function(er) {
-    assert.ifError(er);
+  makeReqs(10, common.mustSucceed(() => {
     assert.strictEqual(count(agent.freeSockets), 2);
     assert.strictEqual(count(agent.sockets), 0);
     assert.strictEqual(serverSockets.length, 5);
 
     // Now make 10 more reqs.
     // should use the 2 free reqs from the pool first.
-    makeReqs(10, function(er) {
-      assert.ifError(er);
+    makeReqs(10, common.mustSucceed(() => {
       assert.strictEqual(count(agent.freeSockets), 2);
       assert.strictEqual(count(agent.sockets), 0);
       assert.strictEqual(serverSockets.length, 8);
@@ -59,8 +57,8 @@ server.listen(0, function() {
       server.close(function() {
         closed = true;
       });
-    });
-  });
+    }));
+  }));
 
   process.on('exit', function() {
     assert(closed);
@@ -86,17 +84,17 @@ server.listen(0, function() {
       port: server.address().port,
       path: `/${i}`,
       agent: agent
-    }, function(res) {
+    }, common.mustCall((res) => {
       let data = '';
       res.setEncoding('ascii');
       res.on('data', function(c) {
         data += c;
       });
-      res.on('end', function() {
+      res.on('end', common.mustCall(() => {
         assert.strictEqual(data, `/${i}`);
         cb();
-      });
-    }).end();
+      }));
+    })).end();
   }
 
   function count(sockets) {
@@ -104,4 +102,4 @@ server.listen(0, function() {
       return n + sockets[name].length;
     }, 0);
   }
-});
+}));
diff --git a/test/sequential/test-http2-max-session-memory.js b/test/sequential/test-http2-max-session-memory.js
index 9b77a45c32..229bd73744 100644
--- a/test/sequential/test-http2-max-session-memory.js
+++ b/test/sequential/test-http2-max-session-memory.js
@@ -27,7 +27,7 @@ server.listen(0, common.mustCall(() => {
   {
     const req = client.request();
 
-    req.on('response', () => {
+    req.on('response', common.mustCall(() => {
       // This one should be rejected because the server is over budget
       // on the current memory allocation
       const req = client.request();
@@ -40,7 +40,7 @@ server.listen(0, common.mustCall(() => {
         server.close();
         client.destroy();
       }));
-    });
+    }));
 
     req.resume();
     req.on('close', common.mustCall());
diff --git a/test/sequential/test-http2-ping-flood.js b/test/sequential/test-http2-ping-flood.js
index b414aca8a4..0f324c30d0 100644
--- a/test/sequential/test-http2-ping-flood.js
+++ b/test/sequential/test-http2-ping-flood.js
@@ -21,11 +21,11 @@ let interval;
 
 server.on('stream', common.mustNotCall());
 server.on('session', common.mustCall((session) => {
-  session.on('error', (e) => {
+  session.on('error', common.mustCallAtLeast((e) => {
     assert.strictEqual(e.code, 'ERR_HTTP2_ERROR');
     assert(e.message.includes('Flooding was detected'));
     clearInterval(interval);
-  });
+  }, 0));
   session.on('close', common.mustCall(() => {
     server.close();
   }));
diff --git a/test/sequential/test-http2-settings-flood.js b/test/sequential/test-http2-settings-flood.js
index 15b3696b9c..8d9efc4c1a 100644
--- a/test/sequential/test-http2-settings-flood.js
+++ b/test/sequential/test-http2-settings-flood.js
@@ -20,11 +20,11 @@ let interval;
 
 server.on('stream', common.mustNotCall());
 server.on('session', common.mustCall((session) => {
-  session.on('error', (e) => {
+  session.on('error', common.mustCallAtLeast((e) => {
     assert.strictEqual(e.code, 'ERR_HTTP2_ERROR');
     assert(e.message.includes('Flooding was detected'));
     clearInterval(interval);
-  });
+  }, 0));
 
   session.on('close', common.mustCall(() => {
     server.close();
diff --git a/test/sequential/test-http2-timeout-large-write-file.js b/test/sequential/test-http2-timeout-large-write-file.js
index a35268b612..15c7d9f0ae 100644
--- a/test/sequential/test-http2-timeout-large-write-file.js
+++ b/test/sequential/test-http2-timeout-large-write-file.js
@@ -47,9 +47,9 @@ server.on('stream', common.mustCall((stream) => {
   stream.end();
 }));
 server.setTimeout(serverTimeout);
-server.on('timeout', () => {
+server.on('timeout', common.mustCallAtLeast(() => {
   assert.ok(!didReceiveData, 'Should not timeout');
-});
+}, 0));
 
 server.listen(0, common.mustCall(() => {
   const client = http2.connect(`https://localhost:${server.address().port}`,
diff --git a/test/sequential/test-http2-timeout-large-write.js b/test/sequential/test-http2-timeout-large-write.js
index 73114776df..9f21042d88 100644
--- a/test/sequential/test-http2-timeout-large-write.js
+++ b/test/sequential/test-http2-timeout-large-write.js
@@ -28,6 +28,9 @@ const server = http2.createSecureServer({
   key: fixtures.readKey('agent1-key.pem'),
   cert: fixtures.readKey('agent1-cert.pem')
 });
+const onTimeout = common.mustCallAtLeast(() => {
+  assert.ok(!didReceiveData, 'Should not timeout');
+}, 0);
 server.on('stream', common.mustCall((stream) => {
   const content = Buffer.alloc(writeSize, 0x44);
 
@@ -39,15 +42,11 @@ server.on('stream', common.mustCall((stream) => {
 
   stream.write(content);
   stream.setTimeout(serverTimeout);
-  stream.on('timeout', () => {
-    assert.ok(!didReceiveData, 'Should not timeout');
-  });
+  stream.on('timeout', onTimeout);
   stream.end();
 }));
 server.setTimeout(serverTimeout);
-server.on('timeout', () => {
-  assert.ok(!didReceiveData, 'Should not timeout');
-});
+server.on('timeout', onTimeout);
 
 server.listen(0, common.mustCall(() => {
   const client = http2.connect(`https://localhost:${server.address().port}`,
diff --git a/test/sequential/test-inspector-open-dispose.mjs b/test/sequential/test-inspector-open-dispose.mjs
index d3add569c9..2e57354fbb 100644
--- a/test/sequential/test-inspector-open-dispose.mjs
+++ b/test/sequential/test-inspector-open-dispose.mjs
@@ -34,11 +34,11 @@ if (process.env.BE_CHILD) {
   function wasDisposedWhenOpenHandler(msg) {
     assert.strictEqual(msg.cmd, 'url');
     assert.strictEqual(msg.url, undefined);
-    ping(firstPort, (err) => {
+    ping(firstPort, common.mustCall((err) => {
       assert(err, 'expected ping to inspector port to fail');
       child.send({ cmd: 'dispose' });
       child.once('message', common.mustCall(wasReDisposedHandler));
-    });
+    }));
   }
 
   function wasReDisposedHandler(msg) {
diff --git a/test/sequential/test-module-loading.js b/test/sequential/test-module-loading.js
index 1d30a2ba73..b4f2d26330 100644
--- a/test/sequential/test-module-loading.js
+++ b/test/sequential/test-module-loading.js
@@ -165,13 +165,13 @@ try {
 assert.strictEqual(path.dirname(__filename), __dirname);
 
 console.error('load custom file types with extensions');
-require.extensions['.test'] = function(module, filename) {
+require.extensions['.test'] = common.mustCall(function(module, filename) {
   let content = fs.readFileSync(filename).toString();
   assert.strictEqual(content, 'this is custom source\n');
   content = content.replace('this is custom source',
                             'exports.test = \'passed\'');
   module._compile(content, filename);
-};
+});
 
 assert.strictEqual(require('../fixtures/registerExt').test, 'passed');
 // Unknown extension, load as .js
diff --git a/test/sequential/test-net-connect-econnrefused.js b/test/sequential/test-net-connect-econnrefused.js
index c55a9ebe24..67f5820221 100644
--- a/test/sequential/test-net-connect-econnrefused.js
+++ b/test/sequential/test-net-connect-econnrefused.js
@@ -40,7 +40,7 @@ const server = net.createServer().listen(0, common.mustCall(() => {
 function pummel() {
   let pending;
   for (pending = 0; pending < ATTEMPTS_PER_ROUND; pending++) {
-    net.createConnection({ port, autoSelectFamily: false }).on('error', function(error) {
+    net.createConnection({ port, autoSelectFamily: false }).on('error', common.mustCallAtLeast((error) => {
       // Family autoselection might be skipped if only a single address is returned by DNS.
       const actualError = Array.isArray(error.errors) ? error.errors[0] : error;
 
@@ -50,7 +50,7 @@ function pummel() {
       if (rounds === ROUNDS) return check();
       rounds++;
       pummel();
-    });
+    }, 0));
     reqs++;
   }
 }
diff --git a/test/sequential/test-net-localport.js b/test/sequential/test-net-localport.js
index e90df73e52..4539acaaee 100644
--- a/test/sequential/test-net-localport.js
+++ b/test/sequential/test-net-localport.js
@@ -3,18 +3,18 @@ const common = require('../common');
 const assert = require('assert');
 const net = require('net');
 
-const server = net.createServer(function(socket) {
+const server = net.createServer(common.mustCall((socket) => {
   assert.strictEqual(socket.remotePort, common.PORT);
   socket.end();
   socket.on('close', function() {
     server.close();
   });
-}).listen(0).on('listening', function() {
+})).listen(0).on('listening', common.mustCall(function() {
   const client = net.connect({
     host: '127.0.0.1',
     port: this.address().port,
     localPort: common.PORT,
-  }).on('connect', function() {
+  }).on('connect', common.mustCall(() => {
     assert.strictEqual(client.localPort, common.PORT);
-  });
-});
+  }));
+}));
diff --git a/test/sequential/test-net-server-bind.js b/test/sequential/test-net-server-bind.js
index 56216d0ed6..f1f274a01d 100644
--- a/test/sequential/test-net-server-bind.js
+++ b/test/sequential/test-net-server-bind.js
@@ -20,7 +20,7 @@ const net = require('net');
 
   server.listen(common.PORT);
 
-  setTimeout(function() {
+  setTimeout(common.mustCall(() => {
     const address = server.address();
     assert.strictEqual(address.port, common.PORT);
 
@@ -30,7 +30,7 @@ const net = require('net');
       assert.strictEqual(server._connectionKey, `4:0.0.0.0:${address.port}`);
 
     server.close();
-  }, 100);
+  }), 100);
 }
 
 // Callback to listen()
diff --git a/test/sequential/test-pipe.js b/test/sequential/test-pipe.js
index c3e0ddef9f..4defd4628e 100644
--- a/test/sequential/test-pipe.js
+++ b/test/sequential/test-pipe.js
@@ -57,9 +57,7 @@ const web = http.Server(common.mustCall((req, res) => {
     res.end();
   }));
 
-  req.connection.on('error', (e) => {
-    assert.ifError(e);
-  });
+  req.connection.on('error', common.mustNotCall());
 }));
 
 web.listen(webPort, startClient);
@@ -70,21 +68,19 @@ const tcp = net.Server(common.mustCall((s) => {
 
   let i = 0;
 
-  s.on('data', (d) => {
+  s.on('data', common.mustCallAtLeast((d) => {
     tcpLengthSeen += d.length;
     for (let j = 0; j < d.length; j++) {
       assert.strictEqual(d[j], buffer[i]);
       i++;
     }
-  });
+  }));
 
   s.on('end', common.mustCall(() => {
     s.end();
   }));
 
-  s.on('error', (e) => {
-    assert.ifError(e);
-  });
+  s.on('error', common.mustNotCall());
 }));
 
 tcp.listen(tcpPort, startClient);
diff --git a/test/sequential/test-process-title.js b/test/sequential/test-process-title.js
index 13a030decf..b4f4b02517 100644
--- a/test/sequential/test-process-title.js
+++ b/test/sequential/test-process-title.js
@@ -1,7 +1,7 @@
 'use strict';
 const common = require('../common');
 const { spawnSync } = require('child_process');
-const { strictEqual } = require('assert');
+const assert = require('assert');
 
 // FIXME add sunos support
 if (common.isSunOS)
@@ -19,4 +19,4 @@ if (common.isWindows)
 
 const xs = 'x'.repeat(1024);
 const proc = spawnSync(process.execPath, ['-p', 'process.title', xs]);
-strictEqual(proc.stdout.toString().trim(), process.execPath);
+assert.strictEqual(proc.stdout.toString().trim(), process.execPath);
diff --git a/test/sequential/test-process-warnings.js b/test/sequential/test-process-warnings.js
index f4457e137e..eca6432fbe 100644
--- a/test/sequential/test-process-warnings.js
+++ b/test/sequential/test-process-warnings.js
@@ -1,6 +1,6 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
 const fixtures = require('../common/fixtures');
 const assert = require('assert');
 const execFile = require('child_process').execFile;
@@ -13,24 +13,24 @@ const traceWarn = ['--trace-warnings', warnmod];
 
 const warningMessage = /^\(.+\)\sWarning: a bad practice warning/;
 
-execFile(node, normal, function(er, stdout, stderr) {
+execFile(node, normal, common.mustCall((er, stdout, stderr) => {
   // Show Process Warnings
   assert.strictEqual(er, null);
   assert.strictEqual(stdout, '');
   assert.match(stderr, warningMessage);
-});
+}));
 
-execFile(node, noWarn, function(er, stdout, stderr) {
+execFile(node, noWarn, common.mustCall((er, stdout, stderr) => {
   // Hide Process Warnings
   assert.strictEqual(er, null);
   assert.strictEqual(stdout, '');
   assert.doesNotMatch(stderr, warningMessage);
-});
+}));
 
-execFile(node, traceWarn, function(er, stdout, stderr) {
+execFile(node, traceWarn, common.mustCall((er, stdout, stderr) => {
   // Show Warning Trace
   assert.strictEqual(er, null);
   assert.strictEqual(stdout, '');
   assert.match(stderr, warningMessage);
   assert.match(stderr, /at Object\.<anonymous>\s\(.+warnings\.js:3:9\)/);
-});
+}));
diff --git a/test/sequential/test-repl-timeout-throw.js b/test/sequential/test-repl-timeout-throw.js
index f788ab295b..d8f1df9564 100644
--- a/test/sequential/test-repl-timeout-throw.js
+++ b/test/sequential/test-repl-timeout-throw.js
@@ -1,5 +1,5 @@
 'use strict';
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 
 const spawn = require('child_process').spawn;
@@ -51,9 +51,9 @@ child.stdout.once('data', function() {
   }
 });
 
-child.on('close', function(c) {
+child.on('close', common.mustCall((c) => {
   assert.strictEqual(c, 0);
   // Make sure we got 3 throws, in the end.
   const lastLine = stdout.trim().split(/\r?\n/).pop();
   assert.strictEqual(lastLine, '> 3');
-});
+}));
diff --git a/test/sequential/test-stream2-fs.js b/test/sequential/test-stream2-fs.js
index 3d06abc921..10414eaab3 100644
--- a/test/sequential/test-stream2-fs.js
+++ b/test/sequential/test-stream2-fs.js
@@ -20,7 +20,7 @@
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 'use strict';
-require('../common');
+const common = require('../common');
 const fixtures = require('../common/fixtures');
 const assert = require('assert');
 
@@ -58,13 +58,13 @@ class TestWriter extends Stream {
 const r = new FSReadable(file);
 const w = new TestWriter();
 
-w.on('results', function(res) {
+w.on('results', common.mustCall((res) => {
   console.error(res, w.length);
   assert.strictEqual(w.length, size);
   assert.deepStrictEqual(res.map(function(c) {
     return c.length;
   }), expectLengths);
   console.log('ok');
-});
+}));
 
 r.pipe(w);
diff --git a/test/sequential/test-stream2-stderr-sync.js b/test/sequential/test-stream2-stderr-sync.js
index db0ed180ed..7704ba8fd2 100644
--- a/test/sequential/test-stream2-stderr-sync.js
+++ b/test/sequential/test-stream2-stderr-sync.js
@@ -22,7 +22,7 @@
 'use strict';
 // Make sure that sync writes to stderr get processed before exiting.
 
-require('../common');
+const common = require('../common');
 
 function parent() {
   const spawn = require('child_process').spawn;
@@ -36,12 +36,12 @@ function parent() {
       err += c;
     });
 
-    child.on('close', function() {
+    child.on('close', common.mustCall(() => {
       assert.strictEqual(err, `child ${c}\nfoo\nbar\nbaz\n`);
       console.log(`ok ${++i} child #${c}`);
       if (i === children.length)
         console.log(`1..${i}`);
-    });
+    }));
   });
 }
 
diff --git a/test/sequential/test-timers-block-eventloop.js b/test/sequential/test-timers-block-eventloop.js
index 6118695c92..25f96d6b37 100644
--- a/test/sequential/test-timers-block-eventloop.js
+++ b/test/sequential/test-timers-block-eventloop.js
@@ -6,14 +6,14 @@ const assert = require('assert');
 const { sleep } = require('internal/util');
 
 let called = false;
-const t1 = setInterval(() => {
+const t1 = setInterval(common.mustCallAtLeast(() => {
   assert(!called);
   called = true;
   setImmediate(common.mustCall(() => {
     clearInterval(t1);
     clearInterval(t2);
   }));
-}, 10);
+}), 10);
 
 const t2 = setInterval(() => {
   sleep(20);
diff --git a/test/sequential/test-timers-set-interval-excludes-callback-duration.js b/test/sequential/test-timers-set-interval-excludes-callback-duration.js
index b32c7e7e3c..23127afc59 100644
--- a/test/sequential/test-timers-set-interval-excludes-callback-duration.js
+++ b/test/sequential/test-timers-set-interval-excludes-callback-duration.js
@@ -1,23 +1,23 @@
 // Flags: --expose-internals
 'use strict';
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const { sleep } = require('internal/util');
 
 let cntr = 0;
 let first;
-const t = setInterval(() => {
+const t = setInterval(common.mustCallAtLeast(() => {
   cntr++;
   if (cntr === 1) {
     sleep(100);
     // Ensure that the event loop passes before the second interval
-    setImmediate(() => assert.strictEqual(cntr, 1));
+    setImmediate(common.mustCall(() => assert.strictEqual(cntr, 1)));
     first = Date.now();
   } else if (cntr === 2) {
     assert(Date.now() - first < 100);
     clearInterval(t);
   }
-}, 100);
+}), 100);
 const t2 = setInterval(() => {
   if (cntr === 2) {
     clearInterval(t2);
diff --git a/test/sequential/test-tls-psk-client.js b/test/sequential/test-tls-psk-client.js
index c07b1f92d9..c9a904e729 100644
--- a/test/sequential/test-tls-psk-client.js
+++ b/test/sequential/test-tls-psk-client.js
@@ -36,12 +36,12 @@ let serverOut = '';
 server.stderr.on('data', (data) => serverErr += data);
 server.stdout.on('data', (data) => serverOut += data);
 server.on('error', common.mustNotCall());
-server.on('exit', (code, signal) => {
+server.on('exit', common.mustCall((code, signal) => {
   // Server is expected to be terminated by cleanUp().
   assert.strictEqual(code, null,
                      `'${server.spawnfile} ${server.spawnargs.join(' ')}' unexpected exited with output:\n${serverOut}\n${serverErr}`);
   assert.strictEqual(signal, 'SIGTERM');
-});
+}));
 
 const cleanUp = (err) => {
   clearTimeout(timeout);
diff --git a/test/sequential/test-tls-session-timeout.js b/test/sequential/test-tls-session-timeout.js
index 14baabd7a6..44e8d537fc 100644
--- a/test/sequential/test-tls-session-timeout.js
+++ b/test/sequential/test-tls-session-timeout.js
@@ -90,7 +90,7 @@ function doTest() {
     client.stdout.on('data', (data) => {
       clientOutput += data.toString();
     });
-    client.on('exit', (code) => {
+    client.on('exit', common.mustCall((code) => {
       let connectionType;
       // Log the output for debugging purposes. Don't remove them or otherwise
       // the CI output is useless when this test flakes.
@@ -120,7 +120,7 @@ function doTest() {
       assert.strictEqual(code, 0);
       assert.strictEqual(connectionType, expectedType);
       cb(connectionType);
-    });
+    }));
   }
 
   const server = tls.createServer(options, (cleartext) => {
diff --git a/test/sequential/test-without-async-context-frame.mjs b/test/sequential/test-without-async-context-frame.mjs
index 087bb67b71..e7342f03a4 100644
--- a/test/sequential/test-without-async-context-frame.mjs
+++ b/test/sequential/test-without-async-context-frame.mjs
@@ -2,7 +2,7 @@ import { isWindows } from '../common/index.mjs';
 import { spawn } from 'node:child_process';
 import { once } from 'node:events';
 import { fileURLToPath } from 'node:url';
-import { strictEqual } from 'node:assert';
+import assert from 'node:assert';
 
 const python = process.env.PYTHON || (isWindows ? 'python' : 'python3');
 
@@ -21,4 +21,4 @@ const proc = spawn(python, [
 });
 
 const [code] = await once(proc, 'exit');
-strictEqual(code, 0);
+assert.strictEqual(code, 0);
diff --git a/test/sequential/test-worker-eventlooputil.js b/test/sequential/test-worker-eventlooputil.js
index bf7ff7da00..39c6d723ff 100644
--- a/test/sequential/test-worker-eventlooputil.js
+++ b/test/sequential/test-worker-eventlooputil.js
@@ -98,7 +98,7 @@ function checkWorkerActive() {
   const w = workerELU();
 
   metricsCh.port2.postMessage({ cmd: 'spin', dur: 50 });
-  metricsCh.port2.once('message', (wElu) => {
+  metricsCh.port2.once('message', mustCall((wElu) => {
     const w2 = workerELU(w);
 
     assert.ok(w2.active >= 50, `${w2.active} < 50`);
@@ -107,7 +107,7 @@ function checkWorkerActive() {
               `${idleActive(wElu)} >= ${idleActive(w2)}`);
 
     metricsCh.port2.postMessage({ cmd: 'close' });
-  });
+  }));
 }
 
 function idleActive(elu) {