public void CallDataSaveChangesMethod()
        {
            //Arrange
            var barsRepoMock = new Mock <IEntityFrameworkRepository <ShishaBar> >();

            barsRepoMock.Setup(x => x.Add(It.IsAny <ShishaBar>())).Verifiable();
            var dataMock = new Mock <IShishaTimeData>();

            dataMock.Setup(x => x.Bars).Verifiable();
            dataMock.Setup(x => x.Bars).Returns(barsRepoMock.Object);
            dataMock.Setup(x => x.SaveChanges()).Verifiable();
            var barsService = new BarsService(dataMock.Object);
            var mockedBar   = new Mock <ShishaBar>();

            //Act
            barsService.AddBar(mockedBar.Object);

            //Assert
            dataMock.Verify(x => x.SaveChanges(), Times.Once());
        }