Asserts_problem.cs

  [Test]
  public void ApplyBlackFridayDiscount_Should_ApplyBlackFridayDiscount_When_CalledOnNewProduct()
  {
      // given
      var product = CreateProduct(basePrice: 100);

      // when
      product.ApplyBlackFridayDiscount();

      // then
      product.Discount.Should().NotBeNull();
      product.Discount.Name.Should().Be("Black Friday");
      product.Discount.PercentageValue.Should().Be(20);
      product.BasePrice.Should().NotBe(product.SalesPrice);
      product.SalesPrice.Should().Be(80);
      product.IsAvailable.Should().Be(true);
  }