added instructions

Author: machow

R-projects-test-example.ipynb

@@ -1,5 +1,29 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Checking Projects with testthat\n",
+    "-----------------------------\n",
+    "\n",
+    "In this notebook, a testthat reporter sends test output to the jupyter client.\n",
+    "To see this in action, paste this javascript into your console:\n",
+    "\n",
+    "```\n",
+    "Jupyter.notebook.kernel.comm_manager.register_target('dc_project',\n",
+    "    function(comm, msg) {\n",
+    "        // comm is the frontend comm instance\n",
+    "        // msg is the comm_open message, which can carry data\n",
+    "\n",
+    "        // Register handlers for later messages:\n",
+    "        comm.on_msg(function(msg) { console.log('msg:', msg)} );\n",
+    "        comm.on_close(function(msg) { console.log('close msg:', msg)});\n",
+    "        //comm.send({'foo': 0});\n",
+    "    })\n",
+    "```"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 93,