public void CallDbContext_SaveMethod()
{
// Arrange
var mockedDbContext = new Mock <IDatabaseContext>();
mockedDbContext.Setup(c => c.Save()).Returns(1).Verifiable();
var studentClassService = new StudentClassService(mockedDbContext.Object);
// Act
var result = studentClassService.Save();
// Assert
Assert.IsTrue(result == 1);
mockedDbContext.Verify(c => c.Save(), Times.Once);
}