To test for alkalinity: Put a few drops of cider vinegar to the soil. If it fizzes, it is alkaline. Use peat moss to reduce alkalinity.
Source: Reader's Digest 1001 Hints and Tips For Your Garden
By Robyn Fed from Hampton, TN
If you're starting a new garden or your plants and flowers just aren't growing well despite your best efforts, then having your soil tested probably makes sense. This page shows you how to test your own soil.