public void ObrisiEntitet_Test()
        {
            var kancelarija = new Kancelarija()
            {
                Opis = "programming"
            };

            var optionBilder = new DbContextOptionsBuilder <ToDoContext>();

            var mockContext = new Mock <ToDoContext>(optionBilder.Options);

            mockContext.Setup(e => e.Set <Kancelarija>().Remove(It.IsAny <Kancelarija>()));

            var repository = new KancelarijaRepository(mockContext.Object);

            repository.ObrisiEntitet(kancelarija);

            mockContext.Verify(e => e.Set <Kancelarija>().Remove(It.IsAny <Kancelarija>()), Times.Exactly(1));
        }