BitSharp.Core.Test.Domain.ChainTest.TestNavigateTowardsFunc C# (CSharp) Method

        public void TestNavigateTowardsFunc()
        {
            // create chains
            var fakeHeaders = new FakeHeaders();
            var header0 = fakeHeaders.GenesisChained();
            var header1 = fakeHeaders.NextChained();
            var header2 = fakeHeaders.NextChained();
            var header3 = fakeHeaders.NextChained();

            var chain0 = new ChainBuilder(new[] { header0, }).ToImmutable();
            var chain1 = new ChainBuilder(new[] { header0, header1, }).ToImmutable();
            var chain2 = new ChainBuilder(new[] { header0, header1, header2 }).ToImmutable();
            var chain3 = new ChainBuilder(new[] { header0, header1, header2, header3 }).ToImmutable();

            // the list of target chains to use, stays 1 ahead and then catches up with chain 3
            var targetStack = new Stack<Chain>(new[] { chain1, chain2, chain3, chain3 }.Reverse());

            // verify navigating towards an updating chain
            CollectionAssert.AreEqual(
                new[]
                {
                    Tuple.Create(+1, header1),
                    Tuple.Create(+1, header2),
                    Tuple.Create(+1, header3)
                }
                , chain0.NavigateTowards(() => targetStack.Pop()).ToList());

            // verify all targets used
            Assert.AreEqual(0, targetStack.Count);
        }