"it should behave identically" Come on man. Please don't tell me you engineer things based on "should". "should" means nothing. The only way test something is

"it should behave identically" Come on man. Please don't tell me you engineer things based on "should". "should" means nothing. The only way test something is to test it, not test something else that "should behave identically". Maybe payments are a special case where you have to do it wrong for some overriding reason, but the general premis to test for real was 100% correct.