import DeferredRunner from "../deferredRunner";

describe("Deferred runner", () => {
  it("should call enqueued methods after activating it", () => {
    const anyfunc = jest.fn();
    let mockLibrary = {
      anyfunc,
    };

    const mockLibrarySpy = jest.spyOn(mockLibrary, "anyfunc");

    const deferredRunner = new DeferredRunner();

    deferredRunner.execute("module", "anyfunc", [1]);
    deferredRunner.execute("module", "anyfunc", [2]);
    deferredRunner.execute("module", "anyfunc", [3]);
    deferredRunner.execute("module", "anyfunc", [4]);

    deferredRunner.activate({ module: mockLibrary });

    expect(mockLibrarySpy).toHaveBeenCalledTimes(4);
  });

  it("should call methods once it is activated", () => {
    const anyfunc = jest.fn();
    let mockLibrary = {
      anyfunc,
    };

    const mockLibrarySpy = jest.spyOn(mockLibrary, "anyfunc");

    const deferredRunner = new DeferredRunner();

    deferredRunner.execute("module", "anyfunc", [1]);
    deferredRunner.execute("module", "anyfunc", [2]);
    deferredRunner.execute("module", "anyfunc", [3]);
    deferredRunner.execute("module", "anyfunc", [4]);

    deferredRunner.activate({ module: mockLibrary });

    deferredRunner.execute("module", "anyfunc", [5]);

    expect(mockLibrarySpy).toHaveBeenCalledTimes(5);
  });

  it("should call a method after an error in a previous one", () => {
    const firstFunc = jest.fn();
    const secondFunc = jest.fn(() => {
      throw new Error();
    });
    const thirdFunc = jest.fn();

    const mockLibrary = {
      firstFunc,
      secondFunc,
      thirdFunc,
    };

    const mockLibrarySpy = jest.spyOn(mockLibrary, "thirdFunc");

    const deferredRunner = new DeferredRunner();

    deferredRunner.execute("module", "firstFunc", [5]);
    deferredRunner.execute("module", "secondFunc", [5]);
    deferredRunner.execute("module", "thirdFunc", [5]);

    deferredRunner.activate({ module: mockLibrary });

    expect(mockLibrarySpy).toHaveBeenCalled();
  });
});