### Question:
JvmUtils { public synchronized static String getFullClassName(String shortName) { if (NAME_TO_CLASS != null) { return NAME_TO_CLASS.get(shortName); } NAME_TO_CLASS = new HashMap<String, String>(); for (File file : getClassPathAsList()) { if (file.length() > MAX_FILE_SIZE) { LOG.debug("skipping looking for providers in large file " + file); continue; } ClassFinder finder = new ClassFinder(); finder.add(file); ClassFilter filter = new AndClassFilter( new RegexClassFilter(WIKIBRAIN_CLASS_PATTERN.pattern()), new NotClassFilter(new RegexClassFilter(WIKIBRAIN_CLASS_BLACKLIST.pattern())) ); Collection<ClassInfo> foundClasses = new ArrayList<ClassInfo>(); finder.findClasses(foundClasses,filter); for (ClassInfo info : foundClasses) { String tokens[] = info.getClassName().split("[.]"); if (tokens.length == 0) { continue; } String n = tokens[tokens.length - 1]; if (!NAME_TO_CLASS.containsKey(n)) { NAME_TO_CLASS.put(n, info.getClassName()); } } } LOG.info("found " + NAME_TO_CLASS.size() + " classes when constructing short to full class name mapping"); return NAME_TO_CLASS.get(shortName); }  static String getClassPath(); synchronized static List<File> getClassPathAsList(); static Process launch(Class klass, String args[]); static Process launch(Class klass, String args[], OutputStream out, OutputStream err, String heapSize); static void setWikiBrainClassPattern(Pattern pattern, Pattern blacklist); static Class classForShortName(String shortName); synchronized static String getFullClassName(String shortName); static final int MAX_FILE_SIZE; }### Answer:
@Test public void testFullClassName() { assertEquals("org.wikibrain.utils.JvmUtils", JvmUtils.getFullClassName("JvmUtils")); assertNull(JvmUtils.getFullClassName("Foozkjasdf")); }