diff --git a/test/parallel/test-fs-promises-write-optional-params.js b/test/parallel/test-fs-promises-write-optional-params.js
index fb16af15e857d7..4dd87155153769 100644
--- a/test/parallel/test-fs-promises-write-optional-params.js
+++ b/test/parallel/test-fs-promises-write-optional-params.js
@@ -33,26 +33,33 @@ async function testInvalid(dest, expectedCode, ...params) {
 async function testValid(dest, buffer, options) {
   const length = options?.length;
   const offset = options?.offset;
-  let fh;
-  try {
-    fh = await fsPromises.open(dest, 'w+');
-    const writeResult = await fh.write(buffer, options);
-    const writeBufCopy = Uint8Array.prototype.slice.call(writeResult.buffer);
+  let fh, writeResult, writeBufCopy, readResult, readBufCopy;
 
-    const readResult = await fh.read(buffer, options);
-    const readBufCopy = Uint8Array.prototype.slice.call(readResult.buffer);
+  try {
+    fh = await fsPromises.open(dest, 'w');
+    writeResult = await fh.write(buffer, options);
+    writeBufCopy = Uint8Array.prototype.slice.call(writeResult.buffer);
+  } finally {
+    await fh?.close();
+  }
 
-    assert.ok(writeResult.bytesWritten >= readResult.bytesRead);
-    if (length !== undefined && length !== null) {
-      assert.strictEqual(writeResult.bytesWritten, length);
-    }
-    if (offset === undefined || offset === 0) {
-      assert.deepStrictEqual(writeBufCopy, readBufCopy);
-    }
-    assert.deepStrictEqual(writeResult.buffer, readResult.buffer);
+  try {
+    fh = await fsPromises.open(dest, 'r');
+    readResult = await fh.read(buffer, options);
+    readBufCopy = Uint8Array.prototype.slice.call(readResult.buffer);
   } finally {
     await fh?.close();
   }
+
+  assert.ok(writeResult.bytesWritten >= readResult.bytesRead);
+  if (length !== undefined && length !== null) {
+    assert.strictEqual(writeResult.bytesWritten, length);
+    assert.strictEqual(readResult.bytesRead, length);
+  }
+  if (offset === undefined || offset === 0) {
+    assert.deepStrictEqual(writeBufCopy, readBufCopy);
+  }
+  assert.deepStrictEqual(writeResult.buffer, readResult.buffer);
 }
 
 (async () => {
diff --git a/test/parallel/test-fs-write-optional-params.js b/test/parallel/test-fs-write-optional-params.js
index 9a1e1cce738270..11390ad42dbfd4 100644
--- a/test/parallel/test-fs-write-optional-params.js
+++ b/test/parallel/test-fs-write-optional-params.js
@@ -29,22 +29,26 @@ function testValidCb(buffer, options, index, callback) {
   const length = options?.length;
   const offset = options?.offset;
   const dest = path.resolve(tmpdir.path, `rwopt_valid_${index}`);
-  fs.open(dest, 'w+', common.mustSucceed((fd) => {
+  fs.open(dest, 'w', common.mustSucceed((fd) => {
     fs.write(fd, buffer, options, common.mustSucceed((bytesWritten, bufferWritten) => {
       const writeBufCopy = Uint8Array.prototype.slice.call(bufferWritten);
-
-      fs.read(fd, buffer, options, common.mustSucceed((bytesRead, bufferRead) => {
-        const readBufCopy = Uint8Array.prototype.slice.call(bufferRead);
-
-        assert.ok(bytesWritten >= bytesRead);
-        if (length !== undefined && length !== null) {
-          assert.strictEqual(bytesWritten, length);
-        }
-        if (offset === undefined || offset === 0) {
-          assert.deepStrictEqual(writeBufCopy, readBufCopy);
-        }
-        assert.deepStrictEqual(bufferWritten, bufferRead);
-        fs.close(fd, common.mustSucceed(callback));
+      fs.close(fd, common.mustSucceed(() => {
+        fs.open(dest, 'r', common.mustSucceed((fd) => {
+          fs.read(fd, buffer, options, common.mustSucceed((bytesRead, bufferRead) => {
+            const readBufCopy = Uint8Array.prototype.slice.call(bufferRead);
+
+            assert.ok(bytesWritten >= bytesRead);
+            if (length !== undefined && length !== null) {
+              assert.strictEqual(bytesWritten, length);
+              assert.strictEqual(bytesRead, length);
+            }
+            if (offset === undefined || offset === 0) {
+              assert.deepStrictEqual(writeBufCopy, readBufCopy);
+            }
+            assert.deepStrictEqual(bufferWritten, bufferRead);
+            fs.close(fd, common.mustSucceed(callback));
+          }));
+        }));
       }));
     }));
   }));
diff --git a/test/parallel/test-fs-write-sync-optional-params.js b/test/parallel/test-fs-write-sync-optional-params.js
index eeaa9c2bbd5595..ac2c501f682242 100644
--- a/test/parallel/test-fs-write-sync-optional-params.js
+++ b/test/parallel/test-fs-write-sync-optional-params.js
@@ -32,19 +32,27 @@ function testInvalid(dest, expectedCode, ...bufferAndOptions) {
 
 function testValid(dest, buffer, options) {
   const length = options?.length;
-  let fd;
+  let fd, bytesWritten, bytesRead;
+
   try {
-    fd = fs.openSync(dest, 'w+');
-    const bytesWritten = fs.writeSync(fd, buffer, options);
-    const bytesRead = fs.readSync(fd, buffer, options);
+    fd = fs.openSync(dest, 'w');
+    bytesWritten = fs.writeSync(fd, buffer, options);
+  } finally {
+    if (fd != null) fs.closeSync(fd);
+  }
 
-    assert.ok(bytesWritten >= bytesRead);
-    if (length !== undefined && length !== null) {
-      assert.strictEqual(bytesWritten, length);
-    }
+  try {
+    fd = fs.openSync(dest, 'r');
+    bytesRead = fs.readSync(fd, buffer, options);
   } finally {
     if (fd != null) fs.closeSync(fd);
   }
+
+  assert.ok(bytesWritten >= bytesRead);
+  if (length !== undefined && length !== null) {
+    assert.strictEqual(bytesWritten, length);
+    assert.strictEqual(bytesRead, length);
+  }
 }
 
 {