@Test
public void isNumberTest() {

  String[] values = {"123", "123.123", "-123.123", "+123.123", ".123", String.valueOf(Integer.MAX_VALUE),
      String.valueOf(Integer.MIN_VALUE), String.valueOf(Double.MAX_VALUE), String.valueOf(Double.MIN_VALUE),
      "abc", "123.", "123a", TsFileConstant.PATH_SEPARATOR, "123.1.23"};
  boolean[] results = {true, true, true, true, true, true,
      true, true, true,
      false, true, false, false, false};
  for (int i = 0; i < values.length; i++) {
    assertEquals(TypeInferenceUtils.isNumber(values[i]), results[i]);
  }
}