J2ObjC

In the summer of 2020, J2ObjC's JRE emulation library (a fork of Android's libcore library ) was updated from Android Nougat to Android 10. The update consisted of adding new APIs, and updating the existing code. Apart from general functionality changes, one of the main goals of the update was to port new test cases to better verify that the JRE emulation library works correctly. While updating the java.time package, I came across a tck.java.time package containing approximately 15,000 new test cases written in TestNG. The problem? J2ObjC only supports JUnit. Instead of supporting both TestNG and JUnit, we decided to build testng2junit , a tool that converts TestNG tests to JUnit. How Can These Frame works be Mapped? To convert from TestNG to JUnit, we needed to determine where the two testing frameworks differed. Attempting to run the TestNG tests through the compiler gave us plenty of compile-time errors to sift through. These syntax errors, coupled with documentation from