https://bugzilla.gnome.org/show_bug.cgi?id=712148
* A helper class for testing code which uses D-Bus without touching the user's
* session bus.
*
+ * Note that #GTestDBus modifies the user’s environment, calling setenv(). This
+ * is not thread-safe, so all #GTestDBus calls should be completed before
+ * threads are spawned, or should have appropriate locking to ensure no access
+ * conflicts to environment variables shared between #GTestDBus and other
+ * threads.
+ *
* <refsect2 id="gio-D-Bus-Test-Scaffolding">
* <title>Creating unit tests using GTestDBus</title>
* <para>