We sell soil test kits but we don’t test soil. If you want to have a soil test done, I’d suggest UMassAmherst. Here’s a link to their soil testing service. https://ag.umass.edu/services/soil-plant-nutrient-testing-laboratory
Before you blame the soil I’d check to make sure you haven’t piled mulch up against the bark of the trunks and stems of your shrubs. This “volcano mulching” is sadly popular lately and slowly chokes off and kills shrubs and trees.