diff --git a/static_src/elements/ezt/ezt-app-base.test.js b/static_src/elements/ezt/ezt-app-base.test.js
new file mode 100644
index 0000000..86eb5b1
--- /dev/null
+++ b/static_src/elements/ezt/ezt-app-base.test.js
@@ -0,0 +1,65 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import {assert} from 'chai';
+import sinon from 'sinon';
+import {EztAppBase} from './ezt-app-base.js';
+
+
+let element;
+
+describe('ezt-app-base', () => {
+  beforeEach(() => {
+    element = document.createElement('ezt-app-base');
+    document.body.appendChild(element);
+  });
+
+  afterEach(() => {
+    document.body.removeChild(element);
+  });
+
+  it('initializes', () => {
+    assert.instanceOf(element, EztAppBase);
+  });
+
+  it('fetches user data when userDisplayName set', async () => {
+    sinon.stub(element, 'fetchUserData');
+
+    element.userDisplayName = 'test@example.com';
+
+    await element.updateComplete;
+
+    sinon.assert.calledOnce(element.fetchUserData);
+    sinon.assert.calledWith(element.fetchUserData, 'test@example.com');
+  });
+
+  it('does not fetch data when userDisplayName is empty', async () => {
+    sinon.stub(element, 'fetchUserData');
+    element.userDisplayName = '';
+
+    await element.updateComplete;
+
+    sinon.assert.notCalled(element.fetchUserData);
+  });
+
+  it('fetches project data when projectName set', async () => {
+    sinon.stub(element, 'fetchProjectData');
+
+    element.projectName = 'chromium';
+
+    await element.updateComplete;
+
+    sinon.assert.calledOnce(element.fetchProjectData);
+    sinon.assert.calledWith(element.fetchProjectData, 'chromium');
+  });
+
+  it('does not fetch data when projectName is empty', async () => {
+    sinon.stub(element, 'fetchProjectData');
+    element.projectName = '';
+
+    await element.updateComplete;
+
+    sinon.assert.notCalled(element.fetchProjectData);
+  });
+});