AI wrote tests for chargeCard(userId, amount). The suite is 100% green. What does this test actually prove?
@patch("payments.stripe_client")
def test_charges_card_successfully(mock_stripe):
mock_stripe.charges.create.return_value = {
"status": "succeeded", "id": "ch_123"
}
result = charge_card(user_id=42, amount=1000)
assert result["status"] == "succeeded"
mock_stripe.charges.create.assert_called_once()