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LibJS: Add Symbol.hasInstance tests

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Matthew Olsson 2020-07-11 15:37:35 -07:00 • committed by Andreas Kling
parent b0296735a5
commit 6075defd55
2 changed files with 17 additions and 0 deletions
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8
Libraries/LibJS/Tests/builtins/Function/Function.prototype.@@hasInstance.js Normal file
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test("basic functionality", () => {
expect(Function.prototype[Symbol.hasInstance]).toHaveLength(1);
function Foo() {}
const foo = new Foo();
expect(Function.prototype[Symbol.hasInstance].call(Foo, foo)).toBeTrue();
});

9
Libraries/LibJS/Tests/custom-@@hasInstance.js Normal file
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test("basic functionality", () => {
function Foo() {}
Foo[Symbol.hasInstance] = value => {
return value === 2;
};
expect(new Foo() instanceof Foo).toBeFalse();
expect(2 instanceof Foo).toBeTrue();
});