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18 lines
624 B
JavaScript
18 lines
624 B
JavaScript
test("basic functionality", () => {
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expect(Object.isExtensible).toHaveLength(1);
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expect(Object.isExtensible()).toBeFalse();
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expect(Object.isExtensible(undefined)).toBeFalse();
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expect(Object.isExtensible(null)).toBeFalse();
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expect(Object.isExtensible(true)).toBeFalse();
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expect(Object.isExtensible(6)).toBeFalse();
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expect(Object.isExtensible("test")).toBeFalse();
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let s = Symbol();
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expect(Object.isExtensible(s)).toBeFalse();
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let o = { foo: "foo" };
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expect(Object.isExtensible(o)).toBeTrue();
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Object.preventExtensions(o);
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expect(Object.isExtensible(o)).toBeFalse();
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});
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