public void EquipmentManager_GetEquipmentByType() { EquipmentAccessor.Arrange(x => x.GetEquipmentByType(Arg.IsAny <long>())) .Returns(Task.FromResult(Enumerable.Empty <Equipment>())) .OccursOnce(); var res = manager.GetEquipmentByType(5).Result; Assert.IsNotNull(res); EquipmentAccessor.Assert(); }