matrix-rust-sdk/bindings/matrix-sdk-crypto-nodejs/tests/sync_events.test.js

const { DeviceLists, UserId } = require("../");

describe(DeviceLists.name, () => {
    test("can be empty", () => {
        const empty = new DeviceLists();

        expect(empty.isEmpty()).toStrictEqual(true);
        expect(empty.changed).toHaveLength(0);
        expect(empty.left).toHaveLength(0);
    });

    test("can be coerced empty", () => {
        const empty = new DeviceLists([], []);

        expect(empty.isEmpty()).toStrictEqual(true);
        expect(empty.changed).toHaveLength(0);
        expect(empty.left).toHaveLength(0);
    });

    test("returns the correct `changed` and `left`", () => {
        const list = new DeviceLists([new UserId("@foo:bar.org")], [new UserId("@baz:qux.org")]);

        expect(list.isEmpty()).toStrictEqual(false);

        expect(list.changed).toHaveLength(1);
        expect(list.changed[0].toString()).toStrictEqual("@foo:bar.org");

        expect(list.left).toHaveLength(1);
        expect(list.left[0].toString()).toStrictEqual("@baz:qux.org");
    });
});