Merge pull request #483 from icarus-consulting/i482-FixNullExceptionOnLiveList

fix listenvelope to move enumerator correctly

Author: MSE1188

src/Yaapii.Atoms/Lists/ListEnvelope.cs

@@ -108,7 +108,7 @@ public T this[int index]
                     }
                     var enumerator = this.origin();
                     var idx = -1;
-                    while (index >= 0 && enumerator.MoveNext() && idx < index)
+                    while (index >= 0 && idx < index && enumerator.MoveNext() )
                     {
                         idx++;
                     }

tests/Yaapii.Atoms.Tests/Lists/LiveListTest.cs

@@ -31,6 +31,15 @@ namespace Yaapii.Atoms.List.Tests
 {
     public sealed class LiveListTest
     {
+        [Fact]
+        public void WorksWithMultipleValues()
+        {
+            var list = new LiveList<string>("one", "two");
+            Assert.NotNull(
+                list[1]
+            );
+        }
+
         [Fact]
         public void KnowsIfEmpty()
         {