diff --git a/opencensus/package.json b/opencensus/package.json
index 35bdb22394..65f6f34065 100644
--- a/opencensus/package.json
+++ b/opencensus/package.json
@@ -14,7 +14,7 @@
   },
   "scripts": {
     "start": "node metrics-quickstart.js",
-    "test": "repo-tools test run --cmd ava -- -T 65s --verbose system-test/*.test.js"
+    "test": "repo-tools test run --cmd mocha -- system-test/*.test.js --timeout=5000"
   },
   "dependencies": {
     "@opencensus/core": "^0.0.9",
@@ -22,7 +22,7 @@
   },
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
-    "ava": "^0.25.0"
+    "mocha": "^6.0.0"
   },
   "cloud-repo-tools": {
     "requiresKeyFile": true,
diff --git a/opencensus/system-test/metrics-quickstart.test.js b/opencensus/system-test/metrics-quickstart.test.js
index a86fec66d6..2780d69730 100644
--- a/opencensus/system-test/metrics-quickstart.test.js
+++ b/opencensus/system-test/metrics-quickstart.test.js
@@ -15,19 +15,25 @@
 
 'use strict';
 
-const test = require(`ava`);
-const tools = require(`@google-cloud/nodejs-repo-tools`);
+const assert = require('assert');
+const tools = require('@google-cloud/nodejs-repo-tools');
 
-test('Should throw an error without projectId', async t => {
+it('Should throw an error without projectId', done => {
   process.env.GOOGLE_PROJECT_ID = '';
   const error = new Error(`Unable to proceed without a Project ID`);
-  await t.throws(tools.runAsync(`node metrics-quickstart.js`), Error, error);
+  tools.runAsync('node metrics-quickstart.js').then(
+    () => {},
+    err => {
+      assert.ok(err.message.includes(error.message));
+      done();
+    }
+  );
 });
 
-test('Should capture stats data and export it to backend', async t => {
+it('Should capture stats data and export it to backend', async () => {
   process.env.GOOGLE_PROJECT_ID = 'fake-id';
   process.env.KUBERNETES_SERVICE_HOST = 'localhost';
-  const output = await tools.runAsync(`node metrics-quickstart.js`);
-  t.regex(output, new RegExp(`Latency *:*`));
-  t.regex(output, /Done recording metrics./);
+  const output = await tools.runAsync('node metrics-quickstart.js');
+  assert.ok(new RegExp('Latency *:*').test(output));
+  assert.ok(new RegExp('Done recording metrics.').test(output));
 });