What type of data or object can be used as a fixture for test data?

Fixtures for test data typically use objects or structures that represent pre-prepared data necessary for the test. These can be JSON files, dictionaries, model classes with filled fields, or special data factories.

For example, in automated testing, you can create a fixture as a dictionary:

let userFixture = ["id": 123, "name": "Test User", "email": "test@example.com"]

Or load JSON with test data to use in tests without dependency on a real database.