Integration testing is a fundamental step of the software development process. Due to the high costs, testers may like to automatically generate the test cases, but unfortunately current test generators are designed for unit testing or system testing, while they are generally ill-suited for integration testing. In this paper, we discuss the challenges of generating test cases for integration testing, and the limitations of current test generators thereby. We elaborate on a novel approach to automatically generating test cases for integration testing, and report initial evidence in support of our approach.