Creates a test case's testParams: an arbitrary value created once at the very start of each
test case, before its input is resolved. Use it to set up per-case state (a seeded database
client, a snapshot, etc.) that the case's input, createHostContext, and assembleResult
callbacks all need to share.
Creates a test case's
testParams: an arbitrary value created once at the very start of each test case, before itsinputis resolved. Use it to set up per-case state (a seeded database client, a snapshot, etc.) that the case'sinput,createHostContext, andassembleResultcallbacks all need to share.