### Question:
StringValueMapBuffer { public String get(int i) { int address = buffer.getInt(i * INTEGER_BYTES + getMetaDataSize()); return getString(address); } StringValueMapBuffer(TreeMap<Integer, String> features);  StringValueMapBuffer(InputStream is); void putMap(TreeMap<Integer, String> input); String get(int i); void write(OutputStream os);  }### Answer:
@Test public void testInsertIntoMap() throws Exception { TreeMap<Integer, String> input = new TreeMap<>(); input.put(1, "hello"); input.put(2, "日本"); input.put(0, "Bye"); StringValueMapBuffer values = new StringValueMapBuffer(input); assertEquals("Bye", values.get(0)); assertEquals("hello", values.get(1)); assertEquals("日本", values.get(2)); }