diff --git a/test/sandbox-coverage.js b/test/sandbox-coverage.js
index 1632f427..c6fb7595 100644
--- a/test/sandbox-coverage.js
+++ b/test/sandbox-coverage.js
@@ -13,3 +13,34 @@ sandbox.configure({
     },
   },
 });
+
+// polyfill for Node.js <12
+Promise.allSettled =
+  Promise.allSettled ||
+  ((promises) =>
+    Promise.all(
+      promises.map((p) =>
+        p
+          .then((value) => ({
+            status: 'fulfilled',
+            value,
+          }))
+          .catch((reason) => ({
+            status: 'rejected',
+            reason,
+          }))
+      )
+    ));
+
+// polyfill for Node.js <10
+process.off = process.off || process.removeListener;
+
+// polyfill for Node.js <10
+const fs = require('fs'); // eslint-disable-line import/newline-after-import
+fs.promises = fs.promises || {};
+fs.promises.unlink =
+  fs.promises.unlink ||
+  ((...args) =>
+    new Promise((resolve, reject) => {
+      fs.unlink(...args, (err) => (err ? reject(err) : resolve()));
+    }));
diff --git a/test/tap/fileAppender-test.js b/test/tap/fileAppender-test.js
index e7a79347..964942c8 100644
--- a/test/tap/fileAppender-test.js
+++ b/test/tap/fileAppender-test.js
@@ -151,7 +151,7 @@ test('log4js fileAppender', (batch) => {
     logger.info('This is an intermediate log message.');
     logger.info('This is the second log message.');
     // wait for the file system to catch up
-    await sleep(100);
+    await sleep(250);
     const fileContents = await fs.readFile(testFile, 'utf8');
     t.match(fileContents, 'This is the second log message.');
     t.equal(fileContents.indexOf('This is the first log message.'), -1);
diff --git a/test/tap/fileSyncAppender-test.js b/test/tap/fileSyncAppender-test.js
index 1330d10b..912b1ab0 100644
--- a/test/tap/fileSyncAppender-test.js
+++ b/test/tap/fileSyncAppender-test.js
@@ -524,7 +524,9 @@ test('log4js fileSyncAppender', (batch) => {
         errorEROFS
       );
 
-      fs.mkdirSync('tmpA/tmpB/tmpC', { recursive: true });
+      fs.mkdirSync('tmpA');
+      fs.mkdirSync('tmpA/tmpB');
+      fs.mkdirSync('tmpA/tmpB/tmpC');
 
       sandboxedLog4js = sandbox.require('../../lib/log4js', {
         requires: {
diff --git a/test/tap/layouts-test.js b/test/tap/layouts-test.js
index e925bf54..8a77b483 100644
--- a/test/tap/layouts-test.js
+++ b/test/tap/layouts-test.js
@@ -121,7 +121,7 @@ test('log4js layouts', (batch) => {
           },
         },
       }),
-      /at (Test\.batch\.test\.t|Test\.<anonymous>)\s+\((.*)test[\\/]tap[\\/]layouts-test\.js:\d+:\d+\)/,
+      /at (Test\.batch\.test(\.t)?|Test\.<anonymous>)\s+\((.*)test[\\/]tap[\\/]layouts-test\.js:\d+:\d+\)/,
       'regexp did not return a match - should print the stacks of a passed error objects'
     );
 
diff --git a/test/tap/multiprocess-shutdown-test.js b/test/tap/multiprocess-shutdown-test.js
index e46fede7..e62cf765 100644
--- a/test/tap/multiprocess-shutdown-test.js
+++ b/test/tap/multiprocess-shutdown-test.js
@@ -4,7 +4,7 @@ const childProcess = require('child_process');
 const sandbox = require('@log4js-node/sandboxed-module');
 const log4js = require('../../lib/log4js');
 
-test('multiprocess appender shutdown (master)', { timeout: 5000 }, (t) => {
+test('multiprocess appender shutdown (master)', { timeout: 10000 }, (t) => {
   log4js.configure({
     appenders: {
       stdout: { type: 'stdout' },