diff --git a/test/parallel/test-whatwg-encoding-textdecoder-fatal.js b/test/parallel/test-whatwg-encoding-textdecoder-fatal.js
index cfb595e78e6b40..6d0ed1ef842d37 100644
--- a/test/parallel/test-whatwg-encoding-textdecoder-fatal.js
+++ b/test/parallel/test-whatwg-encoding-textdecoder-fatal.js
@@ -91,3 +91,15 @@ bad.forEach((t) => {
   assert(!new TextDecoder().fatal);
   assert(new TextDecoder('utf-8', { fatal: true }).fatal);
 }
+
+{
+  const notArrayBufferViewExamples = [false, {}, 1, '', new Error()];
+  notArrayBufferViewExamples.forEach((invalidInputType) => {
+    common.expectsError(() => {
+      new TextDecoder(undefined, null).decode(invalidInputType);
+    }, {
+      code: 'ERR_INVALID_ARG_TYPE',
+      type: TypeError
+    });
+  });
+}
diff --git a/test/parallel/test-whatwg-encoding-textdecoder.js b/test/parallel/test-whatwg-encoding-textdecoder.js
index e87364de1e91f7..10f2c8ea0197e8 100644
--- a/test/parallel/test-whatwg-encoding-textdecoder.js
+++ b/test/parallel/test-whatwg-encoding-textdecoder.js
@@ -76,6 +76,14 @@ if (common.hasIntl) {
     });
 }
 
+// Test TextDecoder, label undefined, options null
+{
+  const dec = new TextDecoder(undefined, null);
+  assert.strictEqual(dec.encoding, 'utf-8');
+  assert.strictEqual(dec.fatal, false);
+  assert.strictEqual(dec.ignoreBOM, false);
+}
+
 // Test TextDecoder, UTF-16le
 {
   const dec = new TextDecoder('utf-16le');