public void Init()
{
// Arrange
var mockRepo = new Mock <IStoreRepository> ();
var mockCartRepo = new Mock <ICartRepository> ();
category = new Category("Cat1");
mockRepo.Setup(s => s.AddCategory(category));
mockRepo.SetupGet(r => r.Categories).Returns(new List <Category> {
category
});
store = new Store(mockRepo.Object, mockCartRepo.Object);
// Act
store.AddCategory(category);
}