Upload Kmake

test/parallel/test-v8-string-is-one-byte-representation.js

@@ -0,0 +1,36 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+const { isStringOneByteRepresentation } = require('v8');
+
+[
+  undefined,
+  null,
+  false,
+  5n,
+  5,
+  Symbol(),
+  () => {},
+  {},
+].forEach((value) => {
+  assert.throws(
+    () => { isStringOneByteRepresentation(value); },
+    /The "content" argument must be of type string/
+  );
+});
+
+{
+  const latin1String = 'hello world!';
+  // Run this inside a for loop to trigger the fast API
+  for (let i = 0; i < 10_000; i++) {
+    assert.strictEqual(isStringOneByteRepresentation(latin1String), true);
+  }
+}
+
+{
+  const utf16String = '你好😀😃';
+  // Run this inside a for loop to trigger the fast API
+  for (let i = 0; i < 10_000; i++) {
+    assert.strictEqual(isStringOneByteRepresentation(utf16String), false);
+  }
+}