### Question:
FunctionRegistryHolder { public int functionsSize() { try (AutoCloseableLock lock = readLock.open()) { return functions.size(); } } FunctionRegistryHolder(); long getVersion(); void addJars(Map<String, List<FunctionHolder>> newJars, long version); void removeJar(String jarName); List<String> getAllJarNames(); List<String> getFunctionNamesByJar(String jarName); ListMultimap<String, DrillFuncHolder> getAllFunctionsWithHolders(AtomicLong version); ListMultimap<String, DrillFuncHolder> getAllFunctionsWithHolders(); ListMultimap<String, String> getAllFunctionsWithSignatures(); List<DrillFuncHolder> getHoldersByFunctionName(String functionName, AtomicLong version); List<DrillFuncHolder> getHoldersByFunctionName(String functionName); boolean containsJar(String jarName); int functionsSize(); String getJarNameByFunctionSignature(String functionName, String functionSignature);  }### Answer:
@Test public void testFunctionsSize() { int count = 0; for (List<FunctionHolder> functionHolders : newJars.values()) { count += functionHolders.size(); } assertEquals("Functions size should match", count, registryHolder.functionsSize()); }