diff --git a/Shared/History.cs b/Shared/History.cs
index a26f81c..d2c5cef 100644
--- a/Shared/History.cs
+++ b/Shared/History.cs
@@ -49,5 +49,14 @@ namespace SemiColinGames {
         return items[lookup];
       }
     }
+
+    // This creates and populates a new array. It's O(n) and should probably only be used for tests.
+    public T[] ToArray() {
+      T[] result = new T[items.Length];
+      for (int i = 0; i < items.Length; i++) {
+        result[i] = this[i];
+      }
+      return result;
+    }
   }
 }
diff --git a/SharedTests/HistoryTests.cs b/SharedTests/HistoryTests.cs
index c16b746..ec8891d 100644
--- a/SharedTests/HistoryTests.cs
+++ b/SharedTests/HistoryTests.cs
@@ -1,5 +1,6 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
+using System.Collections.Generic;
 
 namespace SemiColinGames.Tests {
   [TestClass]
@@ -24,17 +25,17 @@ namespace SemiColinGames.Tests {
     [TestMethod]
     public void TestAdds() {
       var h = new History<int>(3);
-      Assert.AreEqual("0 0 0", String.Format("{0} {1} {2}", h[0], h[1], h[2]));
+      Assert.AreEqual("0 0 0", String.Join(" ", h.ToArray()));
       h.Add(2);
-      Assert.AreEqual("2 0 0", String.Format("{0} {1} {2}", h[0], h[1], h[2]));
+      Assert.AreEqual("2 0 0", String.Join(" ", h.ToArray()));
       h.Add(3);
       h.Add(5);
-      Assert.AreEqual("5 3 2", String.Format("{0} {1} {2}", h[0], h[1], h[2]));
+      Assert.AreEqual("5 3 2", String.Join(" ", h.ToArray()));
       h.Add(7);
-      Assert.AreEqual("7 5 3", String.Format("{0} {1} {2}", h[0], h[1], h[2]));
+      Assert.AreEqual("7 5 3", String.Join(" ", h.ToArray()));
       h.Add(11);
       h.Add(13);
-      Assert.AreEqual("13 11 7", String.Format("{0} {1} {2}", h[0], h[1], h[2]));
+      Assert.AreEqual("13 11 7", String.Join(" ", h.ToArray()));
     }
 
     [TestMethod]