[libpeas] Verify that no plugins are loaded in the extension garbage collect test

[Garrett Regier <gregier src gnome org>]

commit f9c5dedabae004126b01e84865c3cc51166f21aa
Author: Garrett Regier <garrettregier gmail com>
Date:   Fri Nov 20 02:30:12 2015 -0800

    Verify that no plugins are loaded in the extension garbage collect test
    
    We are specificly verifying that calling garbage collect when no
    plugins are loaded does not hit a failure condition. So just
    to be sure, make sure there are no other plugins loaded.

 tests/libpeas/testing/testing-extension.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/tests/libpeas/testing/testing-extension.c b/tests/libpeas/testing/testing-extension.c
index 96be073..100d299 100644
--- a/tests/libpeas/testing/testing-extension.c
+++ b/tests/libpeas/testing/testing-extension.c
@@ -80,10 +80,17 @@ static void
 test_extension_garbage_collect (PeasEngine     *engine,
                                 PeasPluginInfo *info)
 {
+  gchar **loaded_plugins;
+
   peas_engine_garbage_collect (engine);
 
   /* Check that we can collect the garbage when no plugins are loaded */
   g_assert (peas_engine_unload_plugin (engine, info));
+
+  loaded_plugins = peas_engine_get_loaded_plugins (engine);
+  g_assert_cmpstr (loaded_plugins[0], ==, NULL);
+  g_strfreev (loaded_plugins);
+
   peas_engine_garbage_collect (engine);
 }