1 files changed, 64 insertions, 0 deletions
diff --git a/csharp/ProtocolBuffers.Test/Collections/PopsicleListTest.cs b/csharp/ProtocolBuffers.Test/Collections/PopsicleListTest.cs
new file mode 100644
index 00000000..6943672d
--- /dev/null
+++ b/csharp/ProtocolBuffers.Test/Collections/PopsicleListTest.cs
@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using NUnit.Framework;
+
+namespace Google.ProtocolBuffers.Collections {
+  [TestFixture]
+  public class PopsicleListTest {
+
+    [Test]
+    public void MutatingOperationsOnFrozenList() {
+      PopsicleList<string> list = new PopsicleList<string>();
+      list.MakeReadOnly();
+      AssertNotSupported(() => list.Add(""));
+      AssertNotSupported(() => list.Clear());
+      AssertNotSupported(() => list.Insert(0, ""));
+      AssertNotSupported(() => list.Remove(""));
+      AssertNotSupported(() => list.RemoveAt(0));
+    }
+
+    [Test]
+    public void NonMutatingOperationsOnFrozenList() {
+      PopsicleList<string> list = new PopsicleList<string>();
+      list.MakeReadOnly();
+      Assert.IsFalse(list.Contains(""));
+      Assert.AreEqual(0, list.Count);
+      list.CopyTo(new string[5], 0);
+      list.GetEnumerator();
+      Assert.AreEqual(-1, list.IndexOf(""));
+      Assert.IsTrue(list.IsReadOnly);
+    }
+
+    [Test]
+    public void MutatingOperationsOnFluidList() {
+      PopsicleList<string> list = new PopsicleList<string>();
+      list.Add("");
+      list.Clear();
+      list.Insert(0, "");
+      list.Remove("");
+      list.Add("x"); // Just to make the next call valid
+      list.RemoveAt(0);
+    }
+
+    [Test]
+    public void NonMutatingOperationsOnFluidList() {
+      PopsicleList<string> list = new PopsicleList<string>();
+      Assert.IsFalse(list.Contains(""));
+      Assert.AreEqual(0, list.Count);
+      list.CopyTo(new string[5], 0);
+      list.GetEnumerator();
+      Assert.AreEqual(-1, list.IndexOf(""));
+      Assert.IsFalse(list.IsReadOnly);
+    }
+
+    private static void AssertNotSupported(Action action) {
+      try {
+        action();
+        Assert.Fail("Expected NotSupportedException");
+      } catch (NotSupportedException) {
+        // Expected
+      }
+    }
+  }
+}