Function createMessage

packages/ai/tests/message-updaters.test.ts:22–28

(
  id: string,
  role: 'user' | 'assistant' | 'system' = 'assistant',
  parts: UIMessage['parts'] = [],
)

// Helper to create a test message
function createMessage(
  id: string,
  role: 'user' | 'assistant' | 'system' = 'assistant',
  parts: UIMessage['parts'] = [],
): UIMessage {
  return { id, role, parts }
}

describe('message-updaters', () => {
  describe('updateTextPart', () => {