[WIP] add test to show bug where offerHook is called twice #1114
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Bug: If an offer is rejected inside an offerHook, the offerHook is called again.
This PR shows this case with a test: in atomicSwap, Alice creates an initial offer but completes it before bob tries to make a counter offer. Bob's offer is rejected, but strangely, his offerHook is called twice.
Note that this would not show up as a failing test. Because Bob's offer is already supposed to throw an error, another thrown error doesn't fail any tests.