diff --git a/6-InRealEnvironment/6-Tools.ipynb b/6-InRealEnvironment/6-Tools.ipynb
index 3e0ef6b91c793de256b46c9705b377932f9b4728..18e05a1c0ce956287e6ddee7cf6f04df7c3d7883 100644
--- a/6-InRealEnvironment/6-Tools.ipynb
+++ b/6-InRealEnvironment/6-Tools.ipynb
@@ -83,7 +83,8 @@
     "\n",
     "### Google test\n",
     "\n",
-    "This test utility is the only one we know that provide mocks; unfortunately I can't give you first-hand feedback.\n",
+    "[GoogleTest](https://google.github.io/googletest/) includes everything that is needed for testing: [xUnit](https://en.wikipedia.org/wiki/XUnit), test discovery, rich test assertions, death tests, XML test report generation, ... \n",
+    "It is also the only one we know that provide mocks. It is worth saying that mocking in C++ requires your application to be specially designed for it, more informations are available on the [gMock cookbook](https://google.github.io/googletest/gmock_cook_book.html)\n",
     "\n",
     "\n",
     "\n",
@@ -187,4 +188,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 2
-}
+}
\ No newline at end of file
diff --git a/b b/b
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391