public void Get_All_LibraryCards()
{
var mockSet = BuildMock();
var mockCtx = new Mock <LibraryDbContext>();
mockCtx.Setup(c => c.LibraryCards).Returns(mockSet.Object);
var sut = new LibraryCardService(mockCtx.Object);
var queryResult = sut.GetAll().ToList();
queryResult.Should().AllBeOfType(typeof(LibraryCard));
queryResult.Should().HaveCount(2);
queryResult.Should().Contain(a => a.Id == 1);
queryResult.Should().Contain(a => a.Id == 2);
}