public class ProductDataRepository : IProductDataRepository
{
    private MyDatabase_ModelContainer _model;
    protected internal MyDatabase_ModelContainer Model {
        get {
            if (_model == null) {
                _model = new MyDatabase_ModelContainer();
            }
            return _model;
        }
    }

    public IQueryable<Product> GetProducts() {
        return Model.Products.Where(p => p.IsDeleted == false);
    }
}

EF UnitTesting Data Repository

C#