diff --git a/test/parallel/test-trace-events-async-hooks-dynamic.js b/test/parallel/test-trace-events-async-hooks-dynamic.js
index 318f94b182c5c1..9cb0d41c5494c6 100644
--- a/test/parallel/test-trace-events-async-hooks-dynamic.js
+++ b/test/parallel/test-trace-events-async-hooks-dynamic.js
@@ -29,10 +29,10 @@ const proc = cp.spawnSync(
   ['-e', enable + code ],
   {
     cwd: tmpdir.path,
-    env: Object.assign({}, process.env, {
-      'NODE_DEBUG_NATIVE': 'tracing',
-      'NODE_DEBUG': 'tracing'
-    })
+    env: { ...process.env,
+           'NODE_DEBUG_NATIVE': 'tracing',
+           'NODE_DEBUG': 'tracing'
+    }
   });
 
 console.log('process exit with signal:', proc.signal);
diff --git a/test/parallel/test-trace-events-async-hooks-worker.js b/test/parallel/test-trace-events-async-hooks-worker.js
index 338f0f9c09e534..153ef301873151 100644
--- a/test/parallel/test-trace-events-async-hooks-worker.js
+++ b/test/parallel/test-trace-events-async-hooks-worker.js
@@ -36,10 +36,10 @@ const proc = cp.spawnSync(
   [ '--trace-event-categories', 'node.async_hooks', '-e', worker ],
   {
     cwd: tmpdir.path,
-    env: Object.assign({}, process.env, {
-      'NODE_DEBUG_NATIVE': 'tracing',
-      'NODE_DEBUG': 'tracing'
-    })
+    env: { ...process.env,
+           'NODE_DEBUG_NATIVE': 'tracing',
+           'NODE_DEBUG': 'tracing'
+    }
   });
 
 console.log('process exit with signal:', proc.signal);
diff --git a/test/parallel/test-util-inspect.js b/test/parallel/test-util-inspect.js
index fc0bb345da95ce..e7804eec2f2bc0 100644
--- a/test/parallel/test-util-inspect.js
+++ b/test/parallel/test-util-inspect.js
@@ -1366,7 +1366,7 @@ if (typeof Symbol !== 'undefined') {
   const arr = new Array(101).fill();
   const obj = { a: { a: { a: { a: 1 } } } };
 
-  const oldOptions = Object.assign({}, util.inspect.defaultOptions);
+  const oldOptions = { ...util.inspect.defaultOptions };
 
   // Set single option through property assignment.
   util.inspect.defaultOptions.maxArrayLength = null;
diff --git a/test/parallel/test-whatwg-url-custom-properties.js b/test/parallel/test-whatwg-url-custom-properties.js
index 1fbc3ab6238ea3..23742a8e7493e2 100644
--- a/test/parallel/test-whatwg-url-custom-properties.js
+++ b/test/parallel/test-whatwg-url-custom-properties.js
@@ -152,7 +152,7 @@ assert.strictEqual(url.searchParams, oldParams);
   // contains the Symbols that Node uses for brand checking, but not the data
   // properties, which are getters. Verify that urlToOptions() can handle such
   // a case.
-  const copiedUrlObj = Object.assign({}, urlObj);
+  const copiedUrlObj = { ...urlObj };
   const copiedOpts = urlToOptions(copiedUrlObj);
   assert.strictEqual(copiedOpts instanceof URL, false);
   assert.strictEqual(copiedOpts.protocol, undefined);
diff --git a/test/sequential/test-async-wrap-getasyncid.js b/test/sequential/test-async-wrap-getasyncid.js
index cc823cc17fa706..7e9f77cd7a4cc2 100644
--- a/test/sequential/test-async-wrap-getasyncid.js
+++ b/test/sequential/test-async-wrap-getasyncid.js
@@ -8,7 +8,7 @@ const fs = require('fs');
 const v8 = require('v8');
 const fsPromises = fs.promises;
 const net = require('net');
-const providers = Object.assign({}, internalBinding('async_wrap').Providers);
+const providers = { ...internalBinding('async_wrap').Providers };
 const fixtures = require('../common/fixtures');
 const tmpdir = require('../common/tmpdir');
 const { getSystemErrorName } = require('util');
diff --git a/test/sequential/test-inspector-open.js b/test/sequential/test-inspector-open.js
index a0d2eaf1f3415a..967ebe49bfb764 100644
--- a/test/sequential/test-inspector-open.js
+++ b/test/sequential/test-inspector-open.js
@@ -14,7 +14,7 @@ if (process.env.BE_CHILD)
   return beChild();
 
 const child = fork(__filename,
-                   { env: Object.assign({}, process.env, { BE_CHILD: 1 }) });
+                   { env: { ...process.env, BE_CHILD: 1 } });
 
 child.once('message', common.mustCall((msg) => {
   assert.strictEqual(msg.cmd, 'started');
diff --git a/test/sequential/test-inspector-port-cluster.js b/test/sequential/test-inspector-port-cluster.js
index 7b541eb156e0cd..7579f51deeb598 100644
--- a/test/sequential/test-inspector-port-cluster.js
+++ b/test/sequential/test-inspector-port-cluster.js
@@ -328,11 +328,11 @@ function workerProcessMain() {
 function spawnMaster({ execArgv, workers, clusterSettings = {} }) {
   return new Promise((resolve) => {
     childProcess.fork(__filename, {
-      env: Object.assign({}, process.env, {
-        workers: JSON.stringify(workers),
-        clusterSettings: JSON.stringify(clusterSettings),
-        testProcess: true
-      }),
+      env: { ...process.env,
+             workers: JSON.stringify(workers),
+             clusterSettings: JSON.stringify(clusterSettings),
+             testProcess: true
+      },
       execArgv: execArgv.concat(['--expose-internals'])
     }).on('exit', common.mustCall((code, signal) => {
       checkExitCode(code, signal);