Traditional white and black box testing methods are effective in revealing many kinds of defects, but the more elusive bugs slip past them. Model-based testing incorporates additional application concepts in the selection of tests, which may provide more refined bug detection, but does not go far enough. Test selection patterns identify defect-oriented contexts in a program. They also identify suggested tests for risks associated with a specified context. A context and its risks is a kind of conceptual trap designed to corner a bug. The suggested tests will find the bug if it has been caught in the trap.