webAO/__tests__/tryBackgroundUrls.test.ts


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import fileExists from "../utils/fileExists";
import tryBackgroundUrls from "../utils/tryBackgroundUrls";
import transparentPng from "../constants/transparentPng";
jest.mock("../utils/fileExists");

const mockFileExists = fileExists as jest.MockedFunction<typeof fileExists>;

describe("tryBackgroundUrls", () => {
  it("Should try multiple file extensions", async () => {
    const url = "localhost/stoneddiscord/assets";
    mockFileExists
      .mockReturnValueOnce(Promise.resolve(false))
      .mockReturnValueOnce(Promise.resolve(false))
      .mockReturnValueOnce(Promise.resolve(false))
      .mockReturnValueOnce(Promise.resolve(true));
    const actual = await tryBackgroundUrls(url);
    const expected = "localhost/stoneddiscord/assets.apng";
    expect(actual).toBe(expected);
  });

  it("Should return a transparent png if it cant find any assets", async () => {
    const url = "localhost/stoneddiscord/assets";
    mockFileExists.mockReturnValue(Promise.resolve(false));
    const actual = await tryBackgroundUrls(url);
    const expected = transparentPng;
    expect(actual).toBe(expected);
  });
});