diff --git a/webaudio/the-audio-api/the-gainnode-interface/ctor-gain.html b/webaudio/the-audio-api/the-gainnode-interface/ctor-gain.html
index dec273e9698702..dcab1aa0da4c7d 100644
--- a/webaudio/the-audio-api/the-gainnode-interface/ctor-gain.html
+++ b/webaudio/the-audio-api/the-gainnode-interface/ctor-gain.html
@@ -6,30 +6,20 @@
     </title>
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
-    <script src="/webaudio/resources/audit-util.js"></script>
-    <script src="/webaudio/resources/audit.js"></script>
     <script src="/webaudio/resources/audionodeoptions.js"></script>
   </head>
   <body>
-    <script id="layout-test-code">
-      let context;
+    <script>
+      const context = new AudioContext();
 
-      let audit = Audit.createTaskRunner();
+      test(() => {
+        testInvalidConstructor_W3CTH('GainNode', context);
+      }, 'GainNode: invalid constructor');
 
-      audit.define('initialize', (task, should) => {
-        context = initializeContext(should);
-        task.done();
-      });
-
-      audit.define('invalid constructor', (task, should) => {
-        testInvalidConstructor(should, 'GainNode', context);
-        task.done();
-      });
-
-      audit.define('default constructor', (task, should) => {
-        let prefix = 'node0';
-        let node = testDefaultConstructor(should, 'GainNode', context, {
-          prefix: prefix,
+      test(() => {
+        const prefix = 'node0';
+        const node = testDefaultConstructor_W3CTH('GainNode', context, {
+          prefix,
           numberOfInputs: 1,
           numberOfOutputs: 1,
           channelCount: 2,
@@ -37,43 +27,28 @@
           channelInterpretation: 'speakers'
         });
 
-        testDefaultAttributes(should, node, prefix, [{name: 'gain', value: 1}]);
-
-        task.done();
-      });
-
-      audit.define('test AudioNodeOptions', (task, should) => {
-        testAudioNodeOptions(should, context, 'GainNode');
-        task.done();
-      });
-
-      audit.define('constructor with options', (task, should) => {
-        let node;
-        let options = {
-          gain: -2,
-        };
-
-        should(
-            () => {
-              node = new GainNode(context, options);
-            },
-            'node1 = new GainNode(c, ' + JSON.stringify(options) + ')')
-            .notThrow();
-        should(node instanceof GainNode, 'node1 instanceof GainNode')
-            .beEqualTo(true);
-
-        should(node.gain.value, 'node1.gain.value').beEqualTo(options.gain);
-
-        should(node.channelCount, 'node1.channelCount').beEqualTo(2);
-        should(node.channelCountMode, 'node1.channelCountMode')
-            .beEqualTo('max');
-        should(node.channelInterpretation, 'node1.channelInterpretation')
-            .beEqualTo('speakers');
-
-        task.done();
-      });
-
-      audit.run();
+        testDefaultAttributes_W3CTH(
+            node,
+            prefix,
+            [{ name: 'gain', value: 1 }]);
+      }, 'GainNode: default constructor and default attributes');
+
+      test(() => {
+        testAudioNodeOptions_W3CTH(context, 'GainNode');
+      }, 'GainNode: AudioNodeOptions are applied');
+
+      test(() => {
+        const options = { gain: -2 };
+        const node = new GainNode(context, options);
+        assert_true(node instanceof GainNode, 'instanceof GainNode');
+        assert_equals(node.gain.value, options.gain, 'node.gain.value');
+        assert_equals(node.channelCount, 2, 'node.channelCount');
+        assert_equals(node.channelCountMode, 'max', 'node.channelCountMode');
+        assert_equals(
+            node.channelInterpretation,
+            'speakers',
+            'node.channelInterpretation');
+      }, 'GainNode: constructor with options');
     </script>
   </body>
 </html>
