Function createFailingMockAdapter

packages/ai/tests/debug-logging-chat.test.ts:22–31

* Create a mock adapter whose chatStream throws once iteration begins. * Exercises the error path through the chat pipeline.

(
  message = 'mock adapter failure',
)

 * Exercises the error path through the chat pipeline.
 */
function createFailingMockAdapter(
  message = 'mock adapter failure',
): ReturnType<typeof createMockAdapter> {
  return createMockAdapter({
    chatStreamFn: () =>
      (async function* (): AsyncIterable<StreamChunk> {
        throw new Error(message)
      })(),
  })
}

const logPrefixes = (
  calls: ReadonlyArray<ReadonlyArray<unknown>>,