AI-infused applications (AIIAs) are moving into production faster than enterprises’ ability to test their behavior. Traditional testing remains essential but cannot fully validate nondeterministic model outputs, retrieval quality, tool use, agent trajectories, safety, bias, drift, or governance controls. Tech leaders need a continuous AIIA testing loop that combines classical testing, AI evals, red teaming, human review, risk-based release gates, and production telemetry. This report introduces Forrester’s unified framework for testing AIIAs and shows how teams can align testing depth with business risk, build reusable eval assets, and make trustworthy AI a product-delivery discipline.