Example 5 of my JavaScript and React unit tests basics

Example 5.js

describe("searchPosts", () => {
    test("filters the results according to the input search", () => {
        const loadPostsBackup = User.prototype.loadPosts;

        User.prototype.loadPosts = () => [{id: 1, title: "bob"}, {id: 2, title: "alice"}];

        const mockUser = new User({ username: "bob" });

        expect(mockUser.searchPosts("bob")).toEqual([{id: 1, title: "bob"}]);

        User.prototype.loadPosts = loadPostsBackup;
    });
});