diff --git a/test/built-ins/BigInt/asIntN/bigint-tobigint-errors.js b/test/built-ins/BigInt/asIntN/bigint-tobigint-errors.js
index 949f74a98c..8c9cd6714a 100644
--- a/test/built-ins/BigInt/asIntN/bigint-tobigint-errors.js
+++ b/test/built-ins/BigInt/asIntN/bigint-tobigint-errors.js
@@ -11,6 +11,14 @@ features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 assert.sameValue(typeof BigInt, 'function');
 assert.sameValue(typeof BigInt.asIntN, 'function');
+
+assert.throws(TypeError, function () {
+  BigInt.asIntN();
+}, "ToBigInt: no argument => undefined => TypeError");
+assert.throws(TypeError, function () {
+  BigInt.asIntN(0);
+}, "ToBigInt: no argument => undefined => TypeError");
+
 assert.throws(TypeError, function() {
   BigInt.asIntN(0, undefined);
 }, "ToBigInt: undefined => TypeError");
diff --git a/test/built-ins/BigInt/asUintN/bigint-tobigint-errors.js b/test/built-ins/BigInt/asUintN/bigint-tobigint-errors.js
index d12d665f2d..a5e2e35a9d 100644
--- a/test/built-ins/BigInt/asUintN/bigint-tobigint-errors.js
+++ b/test/built-ins/BigInt/asUintN/bigint-tobigint-errors.js
@@ -12,6 +12,13 @@ features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 assert.sameValue(typeof BigInt, 'function');
 assert.sameValue(typeof BigInt.asUintN, 'function');
 
+assert.throws(TypeError, function () {
+  BigInt.asUintN();
+}, "ToBigInt: no argument => undefined => TypeError");
+assert.throws(TypeError, function () {
+  BigInt.asUintN(0);
+}, "ToBigInt: no argument => undefined => TypeError");
+
 assert.throws(TypeError, function() {
   BigInt.asUintN(0, undefined);
 }, "ToBigInt: undefined => TypeError");