errmsg() private method

private errmsg ( string expected, string actual ) : string
expected string
actual string
return string
        public void testSPack()
        {
            string val      = "SomeString";
            string expected = "\x000ASomeString";
            string actual   = StringUtils.SPack(val);

            Assert.AreEqual(expected, actual, Utils.errmsg(expected, actual));
        }
        public void testVarPack()
        {
            string version  = "1.108";
            string expected = "|\x00051.108";
            string actual   = StringUtils.varPack(version);

            Assert.AreEqual(expected, actual, Utils.errmsg(expected, actual));
        }
        public void testLPack()
        {
            string val        = "SomeValue";
            int    countWidth = 3;
            string expected   = "009SomeValue";
            string actual     = StringUtils.LPack(val, countWidth);

            Assert.AreEqual(expected, actual, Utils.errmsg(expected, actual));
        }