--- a/autoland/ui/src/__tests__/ActionButtons.js
+++ b/autoland/ui/src/__tests__/ActionButtons.js
@@ -1,17 +1,37 @@
 import React from 'react';
-import ActionButtons from '../components/ActionButtons';
 import { shallow } from 'enzyme';
 
-test('landable=true shows "Land" button', () => {
-  const instance = shallow(
-    <ActionButtons landable={true} bug="1111111" />
-  );
-  expect(instance.find('.land').length).toBe(1);
-});
+import ActionButtons from '../components/ActionButtons';
+
+describe('Action Buttons', () => {
+
+  test('landable=true shows "Land" button', () => {
+    const mount = shallow(
+      <ActionButtons landable={true} bug="1111111" />
+    );
+    expect(mount.find('.land').length).toBe(1);
+  });
 
-test('landable=false hides "Land" button', () => {
-  const instance = shallow(
-    <ActionButtons landable={false} bug="1111111" />
-  );
-  expect(instance.find('.land').length).toBe(0);
+  test('landable=false hides "Land" button', () => {
+    const mount = shallow(
+      <ActionButtons landable={false} bug="1111111" />
+    );
+    expect(mount.find('.land').length).toBe(0);
+  });
+
+  test('Clicking the "Land" button executes passed callback', () => {
+    const callback = jest.fn();
+    const mount = shallow(
+      <ActionButtons landable={true} bug="1111111" landcallback={callback} />
+    );
+    mount.find('.land').simulate('click');
+
+    expect(callback.mock.calls.length).toBe(1);
+    expect(mount.state('landing')).toBe(true);
+
+    // Also check that it can't be clicked multiple times
+    mount.find('.land').simulate('click');
+    expect(callback.mock.calls.length).toBe(1);
+  });
+
 });

--- a/autoland/ui/src/components/ActionButtons.jsx
+++ b/autoland/ui/src/components/ActionButtons.jsx
@@ -3,17 +3,19 @@ import React from 'react';
 class ActionButtons extends React.Component {
   constructor(props) {
     super(props);
     this.state = { landing: false };
     this.onLandClick = this.onLandClick.bind(this);
   }
 
   onLandClick(e) {
-    e.preventDefault();
+    if (e) {
+      e.preventDefault();
+    }
     if (this.state.landing) {
       return;
     }
     this.setState({ landing: true });
     this.props.landcallback();
   }
 
   render() {