Let us first be clear about what we are talking about.
Eating is different from tasting.
You do not need to eat a mouthful or a spoonful of something and swallow it in order to determine its taste. If a woman takes a spoonful of her cooking, chews it and swallows it, she spoils her fast. Whether she does it in order to avoid a row with her husband who may be very difficult to please when it comes to food, or for any other reason, the verdict remains the same. What she does in this case is eating, which is forbidden during fasting. However, it is not necessary for any person to swallow something in order to find out its taste.