Research and development in the field of automated vehicles has increased along with related works about its software. Software testing in automated vehicles is key to launching safe and reliable vehicles. Several issues in the software testing of automated vehicles have been raised including extremely large space of test input, the high cost of test executions in a physical environment, test oracles not being simple Boolean properties, and so on. Automated vehicle simulations are a solution of cost reduction in test execution. However, space of test input is extremely large. Extremely large space of test input comes from sensing data. In this paper, we discuss the software architecture of automated vehicle simulation as the target software. We raise issues on software testing in these simulations on the basis of the related works. We then discuss test design techniques used in automated vehicle simulations.