27 lines
774 B
JavaScript
27 lines
774 B
JavaScript
test("length is 1", () => {
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expect(Object.isSealed).toHaveLength(1);
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});
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describe("normal behavior", () => {
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test("returns true for non-object argument", () => {
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expect(Object.isSealed(42)).toBeTrue();
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expect(Object.isSealed("foobar")).toBeTrue();
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});
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test("returns false for regular object", () => {
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const o = { foo: "bar" };
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expect(Object.isSealed(o)).toBeFalse();
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});
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test("returns true for sealed object", () => {
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const o = { foo: "bar" };
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Object.seal(o);
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expect(Object.isSealed(o)).toBeTrue();
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});
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test("returns true for non-extensible empty object", () => {
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const o = {};
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Object.preventExtensions(o);
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expect(Object.isSealed(o)).toBeTrue();
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});
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});
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