{
  "context": "This criteria evaluates the engineer's proficiency in using jest.fn() to create mock functions for testing callback-based code. The focus is on proper mock creation, configuration, and inspection capabilities provided by jest.fn().",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Mock function creation",
      "description": "Uses jest.fn() to create mock callback functions (onEmailSent, onEmailFailed, onEmailQueued) in test setup",
      "max_score": 25
    },
    {
      "name": "Mock call verification",
      "description": "Uses toHaveBeenCalled() or toHaveBeenCalledTimes() matchers to verify that mock callbacks were invoked the correct number of times",
      "max_score": 25
    },
    {
      "name": "Mock argument inspection",
      "description": "Uses toHaveBeenCalledWith() matcher to verify that mock callbacks were invoked with the correct email object arguments",
      "max_score": 25
    },
    {
      "name": "Mock call history",
      "description": "Accesses mock.calls or uses mock matchers to verify the sequence or count of callback invocations across multiple test cases, especially in batch processing",
      "max_score": 25
    }
  ]
}