Testing · Middle · Question 73 of 75

What do asymmetric matchers like expect.objectContaining give you?

expect(track).toHaveBeenCalledWith(
  "purchase",
  expect.objectContaining({ total: 30, id: expect.any(String) }),
);

• ✓Correct answer: They check only the parts that matter (some keys, a type) and ignore the rest, like generated ids and timestamps
• 2They make the comparison case-insensitive
• 3They compare objects by reference