Concat() public method

The concat.
public Concat ( ComplexChain sequence ) : ComplexChain
sequence ComplexChain /// The sequence. ///
return ComplexChain
        public void ConcatTwoTest()
        {
            int start = 0;
            int end = chain.GetLength();

            var firstComplexChain = new ComplexChain(chain.Substring(start, end - 1));
            var secondComplexChain = new ComplexChain(chain.Substring(end - 1, end));
            ComplexChain concatChain = firstComplexChain.Concat(secondComplexChain.ToString());
            Assert.True(concatChain.Equals(chain));
        }
 public void IsEmptyTest()
 {
     string str = "s";
     var emptyChain = new ComplexChain(string.Empty);
     Assert.True(emptyChain.IsEmpty());
     emptyChain.Concat(str);
     Assert.True(!emptyChain.IsEmpty());
     emptyChain.ClearAt(0);
     Assert.True(emptyChain.IsEmpty());
 }