component.test.js

import Fake from "./component";
import {shallow} from "enzyme";

describe("Fake Component", () => {
    describe("load method", () => {
        describe("on valid url", () => {
            it("should set remote object to component state", (done) => {
                const url = "http:///.....";

                const httpMock = {
                    request: jest.fn(() => (
                        new Promise((resolve) => {
                            setTimeout(() => {
                                resolve({
                                    hello: "world"
                                });
                            }, 1000);
                        })
                    ))
                };

                const wrapper = shallow(
                    <Fake
                        http={httpMock}
                        url={url}
                    />
                );

                setTimeout(() => {
                    const data = Fake.state("data");

                    expect(httpMock.request).toHavaBeenCalled();
                    expect(data).toBeDefined();
                    expect(typeof data).toBe("object");
                    expect(data.hello).toBe("world");
                    done();
                }, 1500);
            });
        });

        describe("on invalid url", () => {
            it("should print an error message inside component body");
        });
    });
});