You should test three cases:

- Test that I can I fill in dollar amount, should expect a reversal of dollar amount to be created
- Test that I can if I submit modal w/o dollar amount, should expect a reversal of the same amount of the credit to be created
- Test that I can pass in a value GREATER than the dollar amount of the credit, do we display client side error?
- Test that I can pass in a value LESS than 0 to the credit, do we display client side error?