Regression testing of software applications is described. Breakpoints are inserted in a programming code of an object to perform testing of all software applications that use the object. A processor in a computing device can receive data representing a programming code of a functionality of a software application rectifying a problem associated with the functionality of the software application. The processor can determine another software application executing the functionality. The processor can insert a breakpoint in the programming code of the functionality of the software application and the another software application. The breakpoint can be inserted at a location in the programming code of the software application where the problem was rectified. The processor can execute the programming code of the functionality including the inserted breakpoint. The processor can determine, based on the executing, whether the problem has been rectified in the software application and the another software application.