/** Unit test to check for regression of [JACKSON-18]. */
  public void testSmallNumbers() throws Exception {
    ObjectMapper mapper = new ObjectMapper();
    ArrayNode root = mapper.createArrayNode();
    for (int i = -20; i <= 20; ++i) {
      JsonNode n = root.numberNode(i);
      root.add(n);
      // Hmmh. Not sure why toString() won't be triggered otherwise...
      assertEquals(String.valueOf(i), n.toString());
    }

    // Loop over 2 different serialization methods
    for (int type = 0; type < 2; ++type) {
      StringWriter sw = new StringWriter();
      if (type == 0) {
        JsonGenerator gen = new JsonFactory().createGenerator(sw);
        root.serialize(gen, null);
        gen.close();
      } else {
        mapper.writeValue(sw, root);
      }

      String doc = sw.toString();
      JsonParser p = new JsonFactory().createParser(new StringReader(doc));

      assertEquals(JsonToken.START_ARRAY, p.nextToken());
      for (int i = -20; i <= 20; ++i) {
        assertEquals(JsonToken.VALUE_NUMBER_INT, p.nextToken());
        assertEquals(i, p.getIntValue());
        assertEquals("" + i, p.getText());
      }
      assertEquals(JsonToken.END_ARRAY, p.nextToken());
      p.close();
    }
  }
  private void verifyFromMap(String input) throws Exception {
    JsonParser p = new JsonFactory().createParser(input);
    assertEquals(JsonToken.START_OBJECT, p.nextToken());
    assertEquals(JsonToken.FIELD_NAME, p.nextToken());
    assertEquals(FIELD4, getAndVerifyText(p));
    assertEquals(JsonToken.VALUE_STRING, p.nextToken());
    assertEquals(TEXT2, getAndVerifyText(p));

    assertEquals(JsonToken.FIELD_NAME, p.nextToken());
    assertEquals(FIELD3, getAndVerifyText(p));
    assertEquals(JsonToken.VALUE_NUMBER_INT, p.nextToken());
    assertEquals(-1, p.getIntValue());

    assertEquals(JsonToken.FIELD_NAME, p.nextToken());
    assertEquals(FIELD2, getAndVerifyText(p));
    assertEquals(JsonToken.START_ARRAY, p.nextToken());
    assertEquals(JsonToken.END_ARRAY, p.nextToken());

    assertEquals(JsonToken.FIELD_NAME, p.nextToken());
    assertEquals(FIELD1, getAndVerifyText(p));
    assertEquals(JsonToken.VALUE_NUMBER_FLOAT, p.nextToken());
    assertEquals(DOUBLE_VALUE, p.getDoubleValue(), 0);

    assertEquals(JsonToken.END_OBJECT, p.nextToken());

    assertNull(p.nextToken());
    p.close();
  }
  private void verifyFromArray(String input) throws Exception {
    JsonParser p = new JsonFactory().createParser(new StringReader(input));

    assertEquals(JsonToken.START_ARRAY, p.nextToken());

    assertEquals(JsonToken.VALUE_STRING, p.nextToken());
    assertEquals(TEXT1, getAndVerifyText(p));

    assertEquals(JsonToken.VALUE_NUMBER_INT, p.nextToken());
    assertEquals(3, p.getIntValue());

    assertEquals(JsonToken.START_OBJECT, p.nextToken());
    assertEquals(JsonToken.FIELD_NAME, p.nextToken());
    assertEquals(FIELD1, getAndVerifyText(p));

    assertEquals(JsonToken.VALUE_TRUE, p.nextToken());
    assertEquals(JsonToken.FIELD_NAME, p.nextToken());
    assertEquals(FIELD2, getAndVerifyText(p));

    assertEquals(JsonToken.START_ARRAY, p.nextToken());
    assertEquals(JsonToken.END_ARRAY, p.nextToken());
    assertEquals(JsonToken.END_OBJECT, p.nextToken());

    assertEquals(JsonToken.VALUE_FALSE, p.nextToken());

    assertEquals(JsonToken.END_ARRAY, p.nextToken());
    assertNull(p.nextToken());
    p.close();
  }