Abstract: One example method includes discovering a mapping of software components to source files, mapping code changes of a software build to the software components, collecting metric data for test cases, and based on the mapping, and the collecting, selecting a test set, which may include one or more test cases, that covers all the code changes so that when one or more tests of the test case are run, the tests operate to test all the code changes.

Abstract: The present invention discloses a magnet assembly for a speaker, the assembly comprising: a magnet conductive base plate; an inner magnet and at least one outer magnet, the inner magnet and the at least one outer magnet being arranged on the magnet conductive base plate side by side and being spaced to each other by a space; and an inner magnet conductive plate and at least one outer magnet conductive plate arranged on the inner magnet and at least one outer magnet respectively, wherein the magnet conductive plate is provided with at least one outer magnet stopper which abuts against the outer magnet to limit the displacement of the at least one outer magnet in at least one direction. The present invention also discloses a speaker comprising the magnet assembly.