Thank you kindly, TLaukkan (Tommil) for a patch that:

Created nunit test for LSL API and example test for 
llAngleBetween which was marked untested in wiki. 
Run new test succesfully with NUnitGUI and nant build. 

1 files changed, 7 insertions, 0 deletions

diff --git a/prebuild.xml b/prebuild.xml
index 437e2dc..a6fe84f 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -2721,9 +2721,15 @@
 
       <ReferencePath>../../../../../bin/</ReferencePath>
       <Reference name="System" localCopy="false"/>
+      <Reference name="OpenSim.Framework"/>
+      <Reference name="OpenSim.Region.Framework"/>
       <Reference name="OpenSim.Region.ScriptEngine.Shared"/>
+      <Reference name="OpenSim.Region.ScriptEngine.Shared.Api"/>
+      <Reference name="OpenSim.Region.ScriptEngine.XEngine"/>
       <Reference name="OpenSim.Tests.Common"/>
       <Reference name="nunit.framework.dll" />
+      <Reference name="Nini.dll" />
+      <Reference name="OpenMetaverseTypes.dll"/>
       <Files>
         <Match pattern="*.cs" recurse="false"/>
       </Files>
@@ -2818,3 +2824,4 @@
   </Solution>
 </Prebuild>
 
+