diff --git a/code/services/FusionService.php b/code/services/FusionService.php
index 9336a34..9309580 100644
--- a/code/services/FusionService.php
+++ b/code/services/FusionService.php
@@ -30,7 +30,7 @@ public function getFusionTagTypes() {
 
 			// Determine the tag types to consolidate, based on data objects ending with "Tag".
 
-			if((strpos(strrev($class), strrev('Tag')) === 0)) {
+			if((strpos(strrev($class), strrev('Tag')) === 0) && !ClassInfo::classImplements($class, 'TestOnly')) {
 
 				// Use the title field as a default.