public void Add_New_LibraryCard()
{
var mockSet = BuildMock();
var mockCtx = new Mock <LibraryDbContext>();
mockCtx.Setup(c => c.LibraryCards).Returns(mockSet.Object);
var sut = new LibraryCardService(mockCtx.Object);
sut.Add(new LibraryCard());
mockCtx.Verify(s => s.Add(It.IsAny <LibraryCard>()), Times.Once());
mockCtx.Verify(c => c.SaveChanges(), Times.Once());
}
