code: @Test public void testAsciiBytesToString() throws Exception {
    String s="ascii only, I mean it!";
    Assert.assertEquals(s,EncodingUtils.getAsciiString(s.getBytes("US-ASCII")));
    try {
      EncodingUtils.getAsciiString(null);
      Assert.fail("IllegalArgumentException should have been thrown");
    }
   catch (  IllegalArgumentException ex) {
    }
    try {
      EncodingUtils.getAsciiString(null,0,0);
      Assert.fail("IllegalArgumentException should have been thrown");
    }
   catch (  IllegalArgumentException ex) {
    }
  }
  