Activate Websocket and add browser console logging

test/e2e/helpers/SortedWindowHandler.js

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+/**
+ * SortedWindowHandler assists in making e2e tests more robust by returning
+ * deterministic window handles. An instance must be created before new windows
+ * are created and windowHandles must be called each time a window was created or
+ * closed.
+ */
+class SortedWindowHandler {
+  /**
+   * Constructor, must be called before new windows were created.
+   */
+  constructor(client) {
+    this.client = client;
+    this.client.windowHandles(result => {
+      this.handles = result.value;
+      if (this.handles.length > 2) {
+        throw new Error(
+          'SortedWindowHandler must be created before new windows were created.'
+        );
+      }
+    });
+  }
+
+  /**
+   * windowHandles will call given `callback` with an array of window handles.
+   */
+  windowHandles(callback) {
+    this.client.windowHandles(result => {
+      if (result.value.message) {
+        throw new Error(result.value.message);
+      }
+
+      this.handles = this.handles.filter(handle =>
+        result.value.includes(handle)
+      );
+      const remaining = result.value.filter(
+        handle => !this.handles.includes(handle)
+      );
+
+      if (remaining.length === 1) {
+        this.handles.push(remaining[0]);
+      }
+      if (remaining.length > 1) {
+        throw new Error(
+          'Cannot detect new window handle, because more than one windows was created.'
+        );
+      }
+      callback(this.handles);
+    });
+  }
+
+  /**
+   *  Switch to main window handle and remove latest handle.
+   */
+  pop() {
+    this.client.switchWindow(this.handles[0]);
+    this.handles.splice(-1, 1);
+  }
+}
+
+module.exports = SortedWindowHandler;