public void CalculateInvoice_ArgumentIsOk_ReturnsInvoice()
{
// arrange
var invoiceItems = testData.Select(x => new OrderItemModel()
{
ItemId = x.ItemId,
Quantity = 1001
});
// act
string actualResult = orderProcessor.CalculateInvoice(invoiceItems);
// assert
actualResult.Should().NotBeNullOrWhiteSpace();
actualResult.Should().Contain("1001");
foreach (var dataItem in testData)
{
actualResult.Should().Contain(dataItem.Name);
}
}