Tests: add session_bus_run() and use it where possible

This is to avoid having again the subtil bug in dbus-appinfo.c:
session_bus_down() was called before g_test_run() so the test was
running on the user's dbus session.

https://bugzilla.gnome.org/show_bug.cgi?id=697348

gio/tests/dbus-appinfo.c

@@ -280,11 +280,7 @@ main (int argc, char **argv)
 {
   g_test_init (&argc, &argv, NULL);
 
-  session_bus_up ();
-
   g_test_add_func ("/appinfo/dbusappinfo", test_dbus_appinfo);
 
-  session_bus_down ();
-
-  return g_test_run ();
+  return session_bus_run ();
 }

gio/tests/gdbus-export.c

@@ -1732,15 +1732,11 @@ int
 main (int   argc,
       char *argv[])
 {
-  gint ret;
-
   g_test_init (&argc, &argv, NULL);
 
   /* all the tests rely on a shared main loop */
   loop = g_main_loop_new (NULL, FALSE);
 
-  session_bus_up ();
-
   g_test_add_func ("/gdbus/object-registration", test_object_registration);
   g_test_add_func ("/gdbus/registered-interfaces", test_registered_interfaces);
   g_test_add_func ("/gdbus/async-properties", test_async_properties);
@@ -1748,10 +1744,5 @@ main (int   argc,
   /* TODO: check that we spit out correct introspection data */
   /* TODO: check that registering a whole subtree works */
 
-  ret = g_test_run();
-
-  /* tear down bus */
-  session_bus_down ();
-
-  return ret;
+  return session_bus_run ();
 }

gio/tests/gdbus-introspection.c

@@ -303,23 +303,15 @@ int
 main (int   argc,
       char *argv[])
 {
-  gint ret;
-
   g_test_init (&argc, &argv, NULL);
 
   /* all the tests rely on a shared main loop */
   loop = g_main_loop_new (NULL, FALSE);
 
-  session_bus_up ();
-
   g_test_add_func ("/gdbus/introspection-parser", test_introspection_parser);
   g_test_add_func ("/gdbus/introspection-generate", test_generate);
   g_test_add_func ("/gdbus/introspection-default-direction", test_default_direction);
   g_test_add_func ("/gdbus/introspection-extra-data", test_extra_data);
 
-  ret = g_test_run ();
-
-  session_bus_down ();
-
-  return ret;
+  return session_bus_run ();
 }

gio/tests/gdbus-proxy.c

@@ -921,17 +921,14 @@ main (int   argc,
   /* all the tests rely on a shared main loop */
   loop = g_main_loop_new (NULL, FALSE);
 
-  session_bus_up ();
-
   g_test_add_func ("/gdbus/proxy", test_proxy);
   g_test_add_func ("/gdbus/proxy/no-properties", test_no_properties);
   g_test_add_func ("/gdbus/proxy/wellknown-noauto", test_wellknown_noauto);
   g_test_add_func ("/gdbus/proxy/async", test_async);
 
-  ret = g_test_run();
+  ret = session_bus_run();
 
   g_dbus_node_info_unref (introspection_data);
 
-  session_bus_down ();
   return ret;
 }

gio/tests/gdbus-sessionbus.c

@@ -47,3 +47,14 @@ session_bus_down (void)
   g_clear_object (&singleton);
 }
 
+gint
+session_bus_run (void)
+{
+  gint ret;
+
+  session_bus_up ();
+  ret = g_test_run ();
+  session_bus_down ();
+
+  return ret;
+}

gio/tests/gdbus-sessionbus.h

@@ -30,6 +30,7 @@ G_BEGIN_DECLS
 void session_bus_up   (void);
 void session_bus_stop (void);
 void session_bus_down (void);
+gint session_bus_run (void);
 
 G_END_DECLS
 

gio/tests/gdbus-test-codegen.c

@@ -2352,21 +2352,12 @@ int
 main (int   argc,
       char *argv[])
 {
-  gint ret;
-
   g_test_init (&argc, &argv, NULL);
 
-  session_bus_up ();
-
   g_test_add_func ("/gdbus/codegen/annotations", test_annotations);
   g_test_add_func ("/gdbus/codegen/interface_stability", test_interface_stability);
   g_test_add_func ("/gdbus/codegen/object-manager", test_object_manager);
   g_test_add_func ("/gdbus/codegen/property-naming", test_property_naming);
 
-  ret = g_test_run();
-
-  /* tear down bus */
-  session_bus_down ();
-
-  return ret;
+  return session_bus_run ();
 }