block34.ts

describe("fetch tasks", () => {
  beforeEach(() => {
    TasksApi.fetchTasks = jest.fn();
  });

  it("calls success if api succeeds", async () => {
    const context = mockContext(undefined);
    const tasks = [];
    TasksApi.fetchTasks.mockReturnValueOnce(
      Promise.resolve(tasks)
    );

    await actions.fetchTasks(context, {
      type: Actions.FetchTasks
    });
        
    expect(context.commit).toHaveBeenCalledWith({
      type: Mutations.FetchTasksSucceeded,
      tasks
    });
  });

  it("calls error handling on error", async () => {
    const context = mockContext(undefined);
    const error = {info: "Server Out of Potatoes Exception"};
    TasksApi.fetchTasks.mockReturnValueOnce(
      Promise.reject(error)
    );
     
    await actions.fetchTasks(context, {
      type: Actions.FetchTasks
    });
        
    expect(context.commit).toHaveBeenCalledWith({
      type: Mutations.FetchTasksFailed,
      error
    });
  });
});