3ee092cd0c
This is currently a TC39 Stage 2 proposal, but let's go for it! https://github.com/tc39/proposal-accessible-object-hasownproperty I wrote the C++, @linusg found bugs and wrote the test.
35 lines
1,011 B
JavaScript
35 lines
1,011 B
JavaScript
describe("basic functionality", () => {
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test("length", () => {
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expect(Object.hasOwn).toHaveLength(2);
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});
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test("returns true for existent own property", () => {
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const o = { foo: "bar" };
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expect(Object.hasOwn(o, "foo")).toBeTrue();
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});
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test("returns false for non-existent own property", () => {
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const o = {};
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expect(Object.hasOwn(o, "foo")).toBeFalse();
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});
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test("returns false for existent prototype chain property", () => {
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const o = {};
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Object.prototype.foo = "bar";
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expect(Object.hasOwn(o, "foo")).toBeFalse();
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});
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});
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describe("errors", () => {
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test("null argument", () => {
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expect(() => {
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Object.hasOwn(null);
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}).toThrowWithMessage(TypeError, "ToObject on null or undefined");
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});
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test("undefined argument", () => {
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expect(() => {
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Object.hasOwn(undefined);
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}).toThrowWithMessage(TypeError, "ToObject on null or undefined");
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});
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});
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