diff --git a/test/test-multiple-instances-es5.html b/test/test-multiple-instances-es5.html
index b80fe44..b08c949 100644
--- a/test/test-multiple-instances-es5.html
+++ b/test/test-multiple-instances-es5.html
@@ -37,13 +37,15 @@
 		</div>
 
 		<script src="../dist/reveal.es5.js"></script>
+		<script src="../dist/plugin/zoom.js"></script>
 		<script>
 
 			QUnit.module( 'Multiple reveal.js instances' );
 
 			let r1 = new Reveal( document.querySelector( '.deck1 .reveal' ), {
 				embedded: true,
-				keyboard: true
+				keyboard: true,
+				plugins: [RevealZoom]
 			} );
 			r1.initialize();
 
@@ -70,6 +72,13 @@
 
 			});
 
+			QUnit.test( 'Can register plugins independently', function( assert ) {
+
+				assert.ok( r1.hasPlugin( 'zoom' ) );
+				assert.notOk( r2.hasPlugin( 'zoom' ) );
+
+			});
+
 		</script>
 
 	</body>
diff --git a/test/test-multiple-instances.html b/test/test-multiple-instances.html
index 50fe8cc..92f85df 100644
--- a/test/test-multiple-instances.html
+++ b/test/test-multiple-instances.html
@@ -39,12 +39,14 @@
 		<script type="module">
 
 			import Reveal from '../dist/reveal.js';
+			import Zoom from '../plugin/zoom/zoom.js';
 
 			QUnit.module( 'Multiple reveal.js instances' );
 
 			let r1 = new Reveal( document.querySelector( '.deck1 .reveal' ), {
 				embedded: true,
-				keyboard: true
+				keyboard: true,
+				plugins: [Zoom]
 			} );
 			r1.initialize();
 
@@ -71,6 +73,13 @@
 
 			});
 
+			QUnit.test( 'Can register plugins independently', function( assert ) {
+
+				assert.ok( r1.hasPlugin( 'zoom' ) );
+				assert.notOk( r2.hasPlugin( 'zoom' ) );
+
+			});
+
 		</script>
 		<script>
 			QUnit.test( 'Reveal does not leak to window', function( assert ) {