subscribe-test: extract subscribeWithBadFn function
#3630
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Two test groups use essentially the same logic to set up a subscription with an improper subscribeFn, testing both `subscribe` and `createSourceEventStream`. This PR extracts the duplicated logic into a single common `subscribeWithBadFn` function. For convenience, the common function is typed to appropriately return a `Promise<ExecutionResult>` rather than a `Promise<ExecutionResult | AsyncGenerator<...>>`). Because the `subscribeFn` is expected to be "bad," an `AsyncGenerator` should never be returned. If a valid `subscribeFn` is mistakenly passed, an assertion failure is triggered. extracted from graphql#3620
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Two test groups use essentially the same logic to set up a subscription with an improper subscribeFn, testing both
subscribeandcreateSourceEventStream.This PR extracts the duplicated logic into a single common
subscribeWithBadFnfunction.For convenience, the common function is typed to appropriately return a
Promise<ExecutionResult>rather than aPromise<ExecutionResult | AsyncGenerator<...>>). Because thesubscribeFnis expected to be "bad," anAsyncGeneratorshould never be returned. If a validsubscribeFnis mistakenly passed, an assertion failure is triggered.extracted from #3620