TEST ONLY -- Verify behavior of DISP_E_BADINDEX in the IE JavaScript runtime

src/plugin/PluginUserSettings.cpp

Index: src/plugin/PluginUserSettings.cpp
===================================================================
--- a/src/plugin/PluginUserSettings.cpp
+++ b/src/plugin/PluginUserSettings.cpp
@@ -42,6 +42,7 @@
     dispatchID_IsAcceptableAdsEnabled,
     dispatchID_SetAcceptableAdsEnabled,
     dispatchID_IsUpdate,
+    dispatchID_TestBadIndex,
   };
 
   /**
@@ -67,6 +68,7 @@
       m.emplace(L"IsAcceptableAdsEnabled", dispatchID_IsAcceptableAdsEnabled);
       m.emplace(L"SetAcceptableAdsEnabled", dispatchID_SetAcceptableAdsEnabled);
       m.emplace(L"IsUpdate", dispatchID_IsUpdate);
+      m.emplace(L"TestBadIndex", dispatchID_TestBadIndex);
     }
     catch(...)
     {
@@ -440,6 +442,23 @@
         }
       }
       break;
+    case dispatchID_TestBadIndex:
+      {
+        if (pDispparams->cArgs != 1)
+        {
+          return DISP_E_BADPARAMCOUNT;
+        }
+        if (pDispparams->rgvarg[0].vt != VT_I4)
+        {
+          return DISP_E_TYPEMISMATCH;
+        }
+        int index = pDispparams->rgvarg[0].lVal;
+        if (index >= 1)
+        {
+          return DISP_E_BADINDEX;
+        }
+      }
+      break;
     default:
       return DISP_E_MEMBERNOTFOUND;
       break;