56 lines
1.7 KiB
JavaScript
56 lines
1.7 KiB
JavaScript
describe("[[Delete]] trap normal behavior", () => {
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test("forwarding when not defined in handler", () => {
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expect(delete (new Proxy({}, { deleteProperty: undefined })).foo).toBe(true);
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expect(delete (new Proxy({}, { deleteProperty: null })).foo).toBe(true);
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expect(delete (new Proxy({}, {})).foo).toBe(true);
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});
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test("correct arguments supplied to trap", () => {
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let o = {};
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let p = new Proxy(o, {
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deleteProperty(target, property) {
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expect(target).toBe(o);
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expect(property).toBe("foo");
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return true;
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}
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});
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delete p.foo;
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});
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test("conditional deletion", () => {
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o = { foo: 1, bar: 2 };
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p = new Proxy(o, {
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deleteProperty(target, property) {
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if (property === "foo") {
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delete target[property];
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return true;
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}
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return false;
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}
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});
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expect(delete p.foo).toBe(true);
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expect(delete p.bar).toBe(false);
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expect(o.foo).toBe(undefined);
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expect(o.bar).toBe(2);
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});
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});
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describe("[[Delete]] invariants", () => {
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test("cannot report a non-configurable own property as deleted", () => {
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let o = {};
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Object.defineProperty(o, "foo", { configurable: false });
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let p = new Proxy(o, {
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deleteProperty() {
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return true;
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},
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});
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expect(() => {
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delete p.foo;
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}).toThrowWithMessage(TypeError, "Proxy handler's deleteProperty trap violates invariant: cannot report a non-configurable own property of the target as deleted");
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});
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});
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