Using typescript and jest, I am faced with a scenario involving two files: users.service.ts, which imports producer.ts. In an attempt to mock a function in producer.ts, I successfully implement it.
import { sendUserData } from "./users.service";
const processDataSpy = jest.fn().mockImplementation(() => {
throw new Error("failed");
});
jest.mock("../users/manager", () => ({
sendEvent: async (arg1: string, arg2: string, arg3: any) =>
processDataSpy(arg1, arg2, arg3),
}));
describe("users.service", () => {
it("invokes endpoint and returns proper data if unsuccessful", async () => {
const result = await sendUserData(data);
expect(result).toBe(false);
});
However, my goal is to simulate different outcomes in processDataSpy. While currently testing for the error-throwing case as shown above, I also wish to test scenarios where no error is thrown. How can I achieve testing multiple cases without compromising the integrity of the test?
it("invokes endpoint and returns proper data if unsuccessful", async () => {
jest.mock("../users/manager", () => ({
sendEvent: async (arg1: string, arg2: string, arg3: any) =>
processDataSpy(arg1, arg2, arg3),
}));
...
const result = await sendUserData(data);
expect(result).toBe(false);
});
Upon attempting to move the "jest.mock" within the "it" block, I encounter an error suggesting that the mock is either unused or not initialized properly. Is there a way to utilize "jest.mock" within a "describe" or "it" block effectively?