first webextension test

e2e/ambassador/src/client/ipc.js

@@ -0,0 +1,29 @@
+import { METHOD_REQUEST, METHOD_RESPONSE } from '../shared/messages';
+
+const generateId = () => {
+  return Math.random().toString();
+};
+
+const send = (message) => {
+  return new Promise((resolve) => {
+    let id = generateId();
+    let callback = (e) => {
+      let packet = e.data;
+      if (e.source !== window || packet.method !== METHOD_RESPONSE ||
+        packet.id !== id) {
+        return;
+      }
+      window.removeEventListener('message', callback);
+      resolve(packet.message);
+    };
+    window.addEventListener('message', callback);
+
+    window.postMessage({
+      id,
+      method: METHOD_REQUEST,
+      message
+    }, window.origin);
+  });
+};
+
+export { send };

e2e/ambassador/src/client/windows.js

@@ -0,0 +1,17 @@
+import { WINDOWS_CREATE, WINDOWS_REMOVE } from '../shared/messages';
+import * as ipc from './ipc';
+
+const create = () => {
+  return ipc.send({
+    type: WINDOWS_CREATE
+  });
+};
+
+const remove = (windowId) => {
+  return ipc.send({
+    type: WINDOWS_REMOVE,
+    windowId,
+  });
+};
+
+export { create, remove };