This module is a basic example implementation of a gift item module. By default it simply adds a water bottle to the cart when the customer adds a product from the sample data Bags attribute set.

This module is not intended for production use, it is only example code for my presentations at MageTestFest.

Check out the tag beginning-of-kata to start.
Then TDD your way through the creation of the free gift item total model.

• Subtract gift item row totals sum from subtotal
• Subtract gift item base row totals sum from base subtotal
• Set calculation_price of every gift item to 0
• Set base_calculation_price of every gift item to 0
• Call calcRowTotal on each item

1. Create test class
   \Example\GiftItem\Test\Unit\Model\Totals\GiftItemAddressTotalTest
2. Rename namespace to Example\GiftItem\Model\Totals
3. Extend \PHPUnit\Framework\TestCase
4. Test 1: inherits abstract total model
5. Test 2: returns zero if no items are passed
6. Test 3: returns zero if non gift item is passed
7. Test 4: returns gift item row total
8. Test 5: returns sum of gift item row totals only
9. Test 6: returns sum of gift item base row totals only
10. Test 7: subtracts gift item total sums from subtotal
    (for both base row total and row total)
11. Test 8: zeros gift item calculation_price and base_calculation_price
    and calculates the row total and ignores non gift items

(c) 2017 Vinai Kopp
License: BSD-3-Clause