LibJS: Add Symbol.hasInstance tests

Author: https://github.com/mattco98 Commit: 6075defd55 Pull-request: https://github.com/SerenityOS/serenity/pull/2770
2025-05-05 18:52:56 +00:00 · 2020-07-11 15:37:35 -07:00 · 2020-07-11 15:37:35 -07:00 · 6075defd55 · 2024-07-19 04:49:44 +09:00
commit 6075defd55
parent b0296735a5
2 changed files with 17 additions and 0 deletions
--- a/Libraries/LibJS/Tests/custom-@@hasInstance.js
+++ b/Libraries/LibJS/Tests/custom-@@hasInstance.js
@ -0,0 +1,9 @@
+test("basic functionality", () => {
+    function Foo() {}
+    Foo[Symbol.hasInstance] = value => {
+        return value === 2;
+    };
+
+    expect(new Foo() instanceof Foo).toBeFalse();
+    expect(2 instanceof Foo).toBeTrue();
+});