In this article, we propose a combinatorial testing technique for mobile application, thereby suggesting a combination of test-driven data generation techniques as well as developing a support tool named CTGen which using the IPO algorithm to generate test data with input model files, the tool also supports code generation for JUnit testing. The experiment results were compared in terms of test coverage, effort to build a test case with the PICT tool for positive results. Depending on the purpose of developer or tester, testing effort or reliability of application to use appropriate approaches and tools.