public void ReturnCorrectImage_IfPassedIdIsCorrect()
{
// Arrange
var dbSetMock = new Mock <ILibrarySystemEfWrapper <Image> >();
var imageServices = new ImageServices(dbSetMock.Object);
var imageMock = new Mock <Image>();
// Act
imageServices.GetById(imageMock.Object.Id);
// Assert
dbSetMock.Verify(r => r.GetById(imageMock.Object.Id), Times.Once);
}