/** Test evaluation of a valid formula string. */
  @Test
  public void testEvalFormulaStr() {

    logger.info("Test eval formula String");

    Double expected = 15.0;
    String evalStr = "5*3";
    Object resObject = Formula.evalFormulaStr(evalStr);
    Assert.assertNotNull(resObject);
    Double result = (Double) resObject;
    Assert.assertEquals(expected, result);
  }