@Test
 public void testStockControllerWithEmptyCodes() {
   InMemory memory = new InMemory();
   memory.put("STOCK_COMPRESSION", "VND", "data for VND");
   memory.put("STOCK_COMPRESSION", "SSI", "data for SSI");
   JsonParser parser = new JsonParser();
   StockController controller = new StockController(memory, parser);
   String[] json = controller.getStock("", new ModelMap());
   Assert.assertEquals(0, json.length);
 }
 @Test
 public void testStockController() {
   InMemory memory = new InMemory();
   memory.put("STOCK_COMPRESSION", "VND", "data for VND");
   memory.put("STOCK_COMPRESSION", "SSI", "data for SSI");
   JsonParser parser = new JsonParser();
   StockController controller = new StockController(memory, parser);
   String[] json = controller.getStock("VND,SSI", new ModelMap());
   Assert.assertTrue(json[0].contains("VND"));
   Assert.assertTrue(json[1].contains("SSI"));
 }