diff --git a/src/AddIns/Analysis/UnitTesting/Test/Utils/MockUnitTestsPad.cs b/src/AddIns/Analysis/UnitTesting/Test/Utils/MockUnitTestsPad.cs
index 3ee90b95e7..77bbbcc97c 100644
--- a/src/AddIns/Analysis/UnitTesting/Test/Utils/MockUnitTestsPad.cs
+++ b/src/AddIns/Analysis/UnitTesting/Test/Utils/MockUnitTestsPad.cs
@@ -68,5 +68,7 @@ namespace UnitTesting.Tests.Utils
 		{
 			testProjects.Add(testProject);
 		}
+		
+		public void CollapseAll() { }
 	}
 }