### Question:
ProcessEnvironmentForWin32 extends HashMap<String,String> { String toEnvironmentBlock() { List<Entry<String,String>> list = new ArrayList<>(entrySet()); Collections.sort(list, entryComparator); StringBuilder sb = new StringBuilder(size()*30); int cmp = -1; final String SYSTEMROOT = "SystemRoot"; for (Entry<String,String> e : list) { String key = e.getKey(); String value = e.getValue(); if (cmp < 0 && (cmp = nameComparator.compare(key, SYSTEMROOT)) > 0) { addToEnvIfSet(sb, SYSTEMROOT); } addToEnv(sb, key, value); } if (cmp < 0) { addToEnvIfSet(sb, SYSTEMROOT); } if (sb.length() == 0) { sb.append('\u0000'); } sb.append('\u0000'); return sb.toString(); } private  ProcessEnvironmentForWin32(); private  ProcessEnvironmentForWin32(int capacity); @Override String put(String key, String value); @Override String get(Object key); @Override boolean containsKey(Object key); @Override boolean containsValue(Object value); @Override String remove(Object key); @Override Set<String> keySet(); @Override Collection<String> values(); @Override Set<Entry<String,String>> entrySet();  }### Answer:
@Test public void testToEnvironmentBlock() { try { ProcessEnvironmentForWin32 processEnvironmentForWin32 = (ProcessEnvironmentForWin32) ProcessEnvironmentForWin32.emptyEnvironment(0); Assert.assertNotNull(processEnvironmentForWin32.toEnvironmentBlock()); } catch (Error | Exception e) { logger.error(e.getMessage()); } }