try { BigInteger i = NumberUtils.createBigInteger(""); fail("createBigInteger(empty) failed"); } catch (NumberFormatException ex) {  }
this.testCreateBigIntegerFailure(""); this.testCreateBigIntegerFailure(" "); this.testCreateBigIntegerFailure("\b\t\n\f\r");  this.testCreateBigIntegerFailure("\u00A0\uFEFF\u000B\u000C\u001C\u001D\u001E\u001F");
    public void testCreateBigInteger() {        assertEquals("createBigInteger(String) failed", new BigInteger("12345"), NumberUtils.createBigInteger("12345"));        assertEquals("createBigInteger(null) failed", null, NumberUtils.createBigInteger(null));        try {            BigInteger i = NumberUtils.createBigInteger("");            fail("createBigInteger(empty) failed");        } catch (NumberFormatException ex) {            // empty        }    }