filter.test.js

const filter = require("./filter");

describe("Filter function", () => {
  test("it should filter by a search term (link)", () => {
    const input = [
      { id: 1, url: "https://www.url1.dev" },
      { id: 2, url: "https://www.url2.dev" },
      { id: 3, url: "https://www.link3.dev" }
    ];

    const output = [{ id: 3, url: "https://www.link3.dev" }];

    expect(filter(input, "link")).toEqual(output);

    expect(filter(input, "LINK")).toEqual(output);
  });

  test("it should filter by a search term (uRl)", () => {
    // solution ex 1
    const input = [
      { id: 1, url: "https://www.url1.dev" },
      { id: 2, url: "https://www.url2.dev" },
      { id: 3, url: "https://www.link3.dev" }
    ];

    const output = [
      { id: 1, url: "https://www.url1.dev" },
      { id: 2, url: "https://www.url2.dev" }
    ];

    expect(filter(input, "uRl")).toEqual(output);
  });

  test("it should throw when searchTerm is empty string", () => {
    // solution ex 2
    const input = [];
    expect(() => {
      filter(input, "");
    }).toThrowError(Error("searchTerm cannot be empty"));
  });
});