Test Moleculer service with mocking

test.spec.js

const MyService = {
    name: "my",
    actions: {
        getImportantData() {
            return ctx.call("other.get")
                .then(res => {
                    return {
                        id: 1,
                        data: res
                    };
                });
        }
    }
}


describe("Test service", () => {

    const broker = new ServiceBroker();

    // Tested service
    broker.createService(MyService);

    const getAction = jest.fn((ctx) => {
        return [1,2,3];
    });

    // Mock dependent service
    broker.createService({
        name: "other",
        actions: {
            get: getAction
        }
    });

    it("should call 'other.get' and wrap the result", () => {
        return broker.call("my.getImportantData")
            .then(res => {
                expect(res).toEqual({
                    id: 1,
                    data: [1,2,3]
                });

                expect(getAction).toHaveBeenCalledTimes(1);
            })
    });
});