How can I more quickly test different shipping scenarios?

I have a client that is asking for some changes to some [already] very complex shipping logic. We are using a module to "override" the shipping methods' availability and price.

I have been testing each weight class manually, by adjusting the quantity of a product to get my cart to have a specific total weight.

In theory, I should be able to make a utility that shows me each outcome on a single page, but so far all my attempts have failed.

I have already tried to:

  1. Set the weight on a pre-existing quote object, then collect the rates.

    $address = $quote->getShippingAddress();

    This does not work because collectShippingRates re-collects the product weights before actually summing everything up.

  2. I have also tried to create my own shipping/rate_request object, and call Mage::getModel('shipping/shipping')->collectRates($request);.

    This won't work for me because the override rules are applied by an overridden Mage_Sales_Model_Quote_Address_Rate class, which never gets called unless you request the rates through the address model.

  3. I have tried to programmatically modify my quote such that the product quantity gives me the desired weight (for example, I have a product that weighs 1lb, I want to "test" 10lb, so it sets the qty to 10, saves the quote, then requests the shipping rates.) This seems to work at first, but not when I try to do it 4 times in a row. Each subsequent request pulls the rates from the sales_flat_quote_shipping_rate table, showing the same rates as the first test.

  4. Last resort (haven't tried yet) is to create 4 separate carts/quotes, then loading the quote by ID to get the shipping options. I really don't like this solution because it isn't very reusable.

Background: To create the logic initially, I opened 3 browser windows (Firefox + Chrome + Incognito) in order to have 3 different carts (with 3 different weights.) This made it very easy to test and make sure that all 3 weight classes work as specified by the client. Previously there were 3 weight classes, but now there are 4, each with different available methods/pricing overrides/markups. Now that they have a 4th weight class, it seems like I should find a more efficient way of doing this.

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