Quality is delighting customers
There's an obvious bug in returnInput(). If the first or second decision evaluates true and the other evaluates false, the return value will not equal the method's input. An astute software developer will notice this right away, but the statement coverage report shows 100 percent coverage. If a manager sees 100 percent coverage, he or she may get a false sense of security, decide that testing is complete, and release the buggy code into production.