diff --git a/android/testing.go b/android/testing.go
index 519e279..667c1aa 100644
--- a/android/testing.go
+++ b/android/testing.go
@@ -65,7 +65,14 @@
 	})
 
 	if module == nil {
-		panic(fmt.Errorf("failed to find module %q variant %q", name, variant))
+		// find all the modules that do exist
+		allModuleNames := []string{}
+		ctx.VisitAllModules(func(m blueprint.Module) {
+			allModuleNames = append(allModuleNames, m.(Module).Name()+"("+ctx.ModuleSubDir(m)+")")
+		})
+
+		panic(fmt.Errorf("failed to find module %q variant %q."+
+			"\nall modules: %v", name, variant, allModuleNames))
 	}
 
 	return TestingModule{module}