public void SortByPopularity_WhenPopular_ShouldBeOrderd()
{
// Arrange
_sut = new SortService();
var unsorted = Unsorted();
var histories = ShopperHistories();
var current = unsorted.Max(p => p.Name);
// Act
var sorted = _sut.SortByPopularity(unsorted, histories).ToList();
// Assert
Assert.True(sorted[0].Name == "Product A");
Assert.True(sorted[1].Name == "Product B");
}