Test Prioritization in Continuous Integration Environments.

•Historical failure knowledge seems to have strong predictive power in CI environments.•History-based TCP does not necessarily require a large amount of historical data.•Diversity-based TCP can be used effectively when no historical data is available.•Diversity-based TCP can be combined with History-based TCP to improve its effectiveness.•History-based diversity using NCD Multiset achieved highest APFD but lowest performance.