private void DoNegAOORTest(ASCIIEncoding ascii, int charCount)
 {
     Assert.Throws<ArgumentOutOfRangeException>(() =>
     {
         ascii.GetMaxByteCount(charCount);
     });
 }
        private void DoPosTest(ASCIIEncoding ascii, int charCount, int expectedValue)
        {
            int actualValue;

            ascii = new ASCIIEncoding();
            actualValue = ascii.GetMaxByteCount(charCount);
            Assert.Equal(expectedValue, actualValue);
        }