nodejs · aduh95 · Oct 29, 2025 · Oct 25, 2025
diff --git 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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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
@@ -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';

@@ -32,20 +32,20 @@ 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');
   req.on('data', function(chunk) {
     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);
@@ -109,36 +109,36 @@ function ping() {
     method: 'POST'
   };
 
-  const req = http.request(opt, function(res) {
+  const req = http.request(opt, common.mustCallAtLeast((res) => {
     let body = '';
 
     res.setEncoding('utf8');
     res.on('data', function(chunk) {
       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);
 
     // 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));
 }
 
 

@@ -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');
@@ -33,24 +33,22 @@ 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,
     maxFreeSockets: 2
   });
 
   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);
@@ -86,22 +84,22 @@ 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) {
     return Object.keys(sockets).reduce(function(n, name) {
       return n + sockets[name].length;
     }, 0);
   }
-});
+}));
@@ -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());