tests/check/gst/gstcontext.c - mtk-gstreamer - Git at Google

 /* GStreamer
  * Copyright (C) 2013 Collabora Ltd.
  *   Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
  * Copyright (C) 2013 Sebastian Dröge <slomo@circular-chaos.org>
  *
  * gstcontext.c: Unit test for GstContext
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public
  * License along with this library; if not, write to the
  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <gst/check/gstcheck.h>

 GST_START_TEST (test_basic)
 {
   GstContext *c1, *c2;
   GstStructure *s1;
   const GstStructure *s2;

   c1 = gst_context_new ("test", FALSE);
   fail_unless (c1 != NULL);
   fail_unless (GST_IS_CONTEXT (c1));
   s1 = gst_context_writable_structure (c1);
   fail_unless (s1 != NULL);
   gst_structure_set (s1, "foobar", G_TYPE_INT, 1, NULL);

   c2 = gst_context_copy (c1);
   fail_unless (c2 != NULL);
   fail_unless (GST_IS_CONTEXT (c2));
   fail_unless (strcmp (gst_context_get_context_type (c1),
           gst_context_get_context_type (c2)) == 0);
   s2 = gst_context_get_structure (c2);
   fail_unless (s2 != NULL);
   fail_unless (gst_structure_is_equal (s1, s2));

   gst_context_unref (c1);
   gst_context_unref (c2);
 }

 GST_END_TEST;

 typedef struct
 {
   GstElement parent;
   gboolean set_before_ready;
   gboolean set_from_need_context;
   gboolean create_self;

   gboolean have_foobar;
 } GstContextElement;

 typedef struct
 {
   GstElementClass parent_class;
 } GstContextElementClass;

 GType gst_context_element_get_type (void);

 G_DEFINE_TYPE (GstContextElement, gst_context_element, GST_TYPE_ELEMENT);

 static void
 gst_context_element_set_context (GstElement * element, GstContext * context)
 {
   if (strcmp (gst_context_get_context_type (context), "foobar") == 0)
     ((GstContextElement *) element)->have_foobar = TRUE;

   GST_ELEMENT_CLASS (gst_context_element_parent_class)->set_context (element,
       context);
 }

 static GstStateChangeReturn
 gst_context_element_change_state (GstElement * element,
     GstStateChange transition)
 {
   GstContextElement *celement = (GstContextElement *) element;

   if (transition == GST_STATE_CHANGE_NULL_TO_READY) {
     GstContext *context;
     GstMessage *msg;
     gboolean have_foobar = celement->have_foobar;

     if (celement->set_before_ready && !have_foobar)
       return GST_STATE_CHANGE_FAILURE;
     else if (celement->set_before_ready)
       goto chain_up;

     if (celement->set_from_need_context && have_foobar)
       return GST_STATE_CHANGE_FAILURE;

     if (!have_foobar) {
       /* Here we would first query downstream for a context but we have no pads */
       msg = gst_message_new_need_context (GST_OBJECT (element), "foobar");
       gst_element_post_message (element, msg);

       have_foobar = celement->have_foobar;
     }

     if (celement->set_from_need_context && !have_foobar)
       return GST_STATE_CHANGE_FAILURE;
     else if (celement->set_from_need_context)
       goto chain_up;

     if (celement->create_self && have_foobar)
       return GST_STATE_CHANGE_FAILURE;

     if (!have_foobar) {
       context = gst_context_new ("foobar", FALSE);
       gst_element_set_context (element, context);
       msg =
           gst_message_new_have_context (GST_OBJECT (element),
           gst_context_ref (context));
       gst_element_post_message (element, msg);
       gst_context_unref (context);
     }
   }

 chain_up:
   return
       GST_ELEMENT_CLASS (gst_context_element_parent_class)->change_state
       (element, transition);
 }

 static void
 gst_context_element_class_init (GstContextElementClass * klass)
 {
   GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);

   gstelement_class->set_context = gst_context_element_set_context;
   gstelement_class->change_state = gst_context_element_change_state;
 }

 static void
 gst_context_element_init (GstContextElement * self)
 {

 }

 GST_START_TEST (test_element_set_before_ready)
 {
   GstBus *bus;
   GstElement *element;
   GstContext *context;
   GstMessage *msg;

   element = g_object_new (gst_context_element_get_type (), NULL);
   bus = gst_bus_new ();
   gst_element_set_bus (element, bus);

   ((GstContextElement *) element)->set_before_ready = TRUE;

   fail_if (gst_element_set_state (element,
           GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);
   fail_if (gst_bus_pop (bus) != NULL);

   context = gst_context_new ("foobar", FALSE);
   gst_element_set_context (element, context);
   fail_unless (gst_element_set_state (element,
           GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);
   fail_unless ((msg =
           gst_bus_pop_filtered (bus, GST_MESSAGE_STATE_CHANGED)) != NULL);
   gst_message_unref (msg);
   fail_if (gst_bus_pop (bus) != NULL);

   fail_unless (((GstContextElement *) element)->have_foobar);

   gst_context_unref (context);

   gst_element_set_bus (element, NULL);
   fail_unless (gst_element_set_state (element,
           GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

   gst_object_unref (bus);
   gst_object_unref (element);
 }

 GST_END_TEST;

 static GstBusSyncReply
 sync_handler (GstBus * bus, GstMessage * message, gpointer user_data)
 {
   if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_NEED_CONTEXT) {
     const gchar *type;
     GstElement *element = GST_ELEMENT (GST_MESSAGE_SRC (message));
     GstContext *context;

     fail_unless (gst_message_parse_context_type (message, &type));
     fail_unless_equals_string (type, "foobar");
     context = gst_context_new ("foobar", FALSE);
     gst_element_set_context (element, context);
     gst_context_unref (context);
   }

   return GST_BUS_PASS;
 }

 GST_START_TEST (test_element_set_from_need_context)
 {
   GstBus *bus;
   GstElement *element;
   GstMessage *msg;

   element = g_object_new (gst_context_element_get_type (), NULL);
   bus = gst_bus_new ();
   gst_bus_set_sync_handler (bus, sync_handler, NULL, NULL);
   gst_element_set_bus (element, bus);

   ((GstContextElement *) element)->set_from_need_context = TRUE;

   fail_unless (gst_element_set_state (element,
           GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);
   fail_unless ((msg =
           gst_bus_pop_filtered (bus, GST_MESSAGE_NEED_CONTEXT)) != NULL);
   gst_message_unref (msg);
   fail_unless ((msg =
           gst_bus_pop_filtered (bus, GST_MESSAGE_STATE_CHANGED)) != NULL);
   gst_message_unref (msg);
   fail_if (gst_bus_pop (bus) != NULL);

   fail_unless (((GstContextElement *) element)->have_foobar);

   gst_element_set_bus (element, NULL);
   fail_unless (gst_element_set_state (element,
           GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

   gst_object_unref (bus);
   gst_object_unref (element);
 }

 GST_END_TEST;

 GST_START_TEST (test_element_create_self)
 {
   GstBus *bus;
   GstElement *element;
   GstContext *context;
   GstMessage *msg;

   element = g_object_new (gst_context_element_get_type (), NULL);
   bus = gst_bus_new ();
   gst_element_set_bus (element, bus);

   ((GstContextElement *) element)->create_self = TRUE;

   fail_unless (gst_element_set_state (element,
           GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);
   fail_unless ((msg =
           gst_bus_pop_filtered (bus, GST_MESSAGE_NEED_CONTEXT)) != NULL);
   gst_message_unref (msg);
   fail_unless ((msg =
           gst_bus_pop_filtered (bus, GST_MESSAGE_HAVE_CONTEXT)) != NULL);
   gst_message_parse_have_context (msg, &context);
   fail_unless (GST_IS_CONTEXT (context));
   fail_unless_equals_string (gst_context_get_context_type (context), "foobar");
   gst_context_unref (context);
   gst_message_unref (msg);
   fail_unless ((msg =
           gst_bus_pop_filtered (bus, GST_MESSAGE_STATE_CHANGED)) != NULL);
   gst_message_unref (msg);
   fail_if (gst_bus_pop (bus) != NULL);

   fail_unless (((GstContextElement *) element)->have_foobar);

   gst_element_set_bus (element, NULL);
   fail_unless (gst_element_set_state (element,
           GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

   gst_object_unref (bus);
   gst_object_unref (element);
 }

 GST_END_TEST;

 GST_START_TEST (test_element_bin_caching)
 {
   GstBus *bus;
   GstElement *bin;
   GstElement *element, *element2;

   bin = gst_bin_new (NULL);
   element = g_object_new (gst_context_element_get_type (), NULL);
   element2 = g_object_new (gst_context_element_get_type (), NULL);
   gst_bin_add_many (GST_BIN (bin), element, element2, NULL);

   /* FIXME: This assumes (as currently is true) the GstBin activates
    * the last added element first if none of them is a sink or has pads
    */
   ((GstContextElement *) element2)->create_self = TRUE;
   ((GstContextElement *) element)->set_from_need_context = TRUE;

   bus = gst_bus_new ();
   gst_element_set_bus (bin, bus);

   fail_unless (gst_element_set_state (bin,
           GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

   fail_unless (((GstContextElement *) element)->have_foobar);
   fail_unless (((GstContextElement *) element2)->have_foobar);

   gst_element_set_bus (bin, NULL);
   fail_unless (gst_element_set_state (bin,
           GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

   gst_object_unref (bus);
   gst_object_unref (bin);
 }

 GST_END_TEST;

 GST_START_TEST (test_add_element_to_bin)
 {
   GstBus *bus;
   GstElement *bin;
   GstElement *element;
   GList *contexts, *contexts2, *l;

   /* Start with an element not inside a bin requesting a context. Add the
    * element to a bin and check the context propagation. */
   element = g_object_new (gst_context_element_get_type (), NULL);

   ((GstContextElement *) element)->create_self = TRUE;

   fail_unless (gst_element_set_state (element,
           GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

   fail_unless (((GstContextElement *) element)->have_foobar);

   bin = gst_bin_new (NULL);

   bus = gst_bus_new ();
   gst_element_set_bus (bin, bus);

   fail_unless (gst_element_set_state (bin,
           GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

   gst_bin_add (GST_BIN (bin), element);

   /* check the contexts are the same */
   contexts = gst_element_get_contexts (element);
   contexts2 = gst_element_get_contexts (bin);
   for (l = contexts; l; l = l->next)
     fail_unless (g_list_find (contexts2, l->data));
   g_list_free_full (contexts, (GDestroyNotify) gst_context_unref);
   g_list_free_full (contexts2, (GDestroyNotify) gst_context_unref);

   gst_element_set_bus (bin, NULL);
   fail_unless (gst_element_set_state (bin,
           GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

   gst_object_unref (bus);
   gst_object_unref (bin);
 }

 GST_END_TEST;

 GST_START_TEST (test_add_element_to_bin_collision)
 {
   GstBus *bus;
   GstElement *bin;
   GstElement *element, *element2;
   GList *contexts, *contexts2, *l;

   /* Start with a bin containing an element that requests a context and then add
    * another element to the bin that has already requested the same context. */

   bin = gst_bin_new (NULL);
   element = g_object_new (gst_context_element_get_type (), NULL);
   gst_bin_add (GST_BIN (bin), element);

   ((GstContextElement *) element)->create_self = TRUE;

   bus = gst_bus_new ();
   gst_element_set_bus (bin, bus);

   fail_unless (gst_element_set_state (bin,
           GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

   fail_unless (((GstContextElement *) element)->have_foobar);

   /* propagate a context without a parent bin */
   element2 = g_object_new (gst_context_element_get_type (), NULL);
   ((GstContextElement *) element2)->create_self = TRUE;

   fail_unless (gst_element_set_state (element2,
           GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

   fail_unless (((GstContextElement *) element2)->have_foobar);

   ((GstContextElement *) element)->have_foobar = FALSE;
   ((GstContextElement *) element2)->have_foobar = FALSE;

   /* add element to bin should result in the propagation of contexts to the
    * added element */
   gst_bin_add (GST_BIN (bin), element2);

   fail_unless (((GstContextElement *) element)->have_foobar == FALSE);
   fail_unless (((GstContextElement *) element2)->have_foobar);

   /* check the contexts are the same */
   contexts = gst_element_get_contexts (element);
   contexts2 = gst_element_get_contexts (element2);
   for (l = contexts; l; l = l->next)
     fail_unless (g_list_find (contexts2, l->data));
   g_list_free_full (contexts, (GDestroyNotify) gst_context_unref);
   contexts = gst_element_get_contexts (bin);
   for (l = contexts; l; l = l->next)
     fail_unless (g_list_find (contexts2, l->data));
   g_list_free_full (contexts, (GDestroyNotify) gst_context_unref);
   g_list_free_full (contexts2, (GDestroyNotify) gst_context_unref);

   gst_element_set_bus (bin, NULL);
   fail_unless (gst_element_set_state (bin,
           GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

   gst_object_unref (bus);
   gst_object_unref (bin);
 }

 GST_END_TEST;

 static Suite *
 gst_context_suite (void)
 {
   Suite *s = suite_create ("GstContext");
   TCase *tc_chain = tcase_create ("context tests");

   tcase_set_timeout (tc_chain, 0);

   suite_add_tcase (s, tc_chain);
   tcase_add_test (tc_chain, test_basic);
   tcase_add_test (tc_chain, test_element_set_before_ready);
   tcase_add_test (tc_chain, test_element_set_from_need_context);
   tcase_add_test (tc_chain, test_element_create_self);
   tcase_add_test (tc_chain, test_element_bin_caching);
   tcase_add_test (tc_chain, test_add_element_to_bin);
   tcase_add_test (tc_chain, test_add_element_to_bin_collision);

   return s;
 }

 GST_CHECK_MAIN (gst_context);
	/* GStreamer
	* Copyright (C) 2013 Collabora Ltd.
	* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
	* Copyright (C) 2013 Sebastian Dröge <slomo@circular-chaos.org>
	*
	* gstcontext.c: Unit test for GstContext
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public
	* License along with this library; if not, write to the
	* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/
	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <gst/check/gstcheck.h>

	GST_START_TEST (test_basic)
	{
	GstContext c1, c2;
	GstStructure *s1;
	const GstStructure *s2;

	c1 = gst_context_new ("test", FALSE);
	fail_unless (c1 != NULL);
	fail_unless (GST_IS_CONTEXT (c1));
	s1 = gst_context_writable_structure (c1);
	fail_unless (s1 != NULL);
	gst_structure_set (s1, "foobar", G_TYPE_INT, 1, NULL);

	c2 = gst_context_copy (c1);
	fail_unless (c2 != NULL);
	fail_unless (GST_IS_CONTEXT (c2));
	fail_unless (strcmp (gst_context_get_context_type (c1),
	gst_context_get_context_type (c2)) == 0);
	s2 = gst_context_get_structure (c2);
	fail_unless (s2 != NULL);
	fail_unless (gst_structure_is_equal (s1, s2));

	gst_context_unref (c1);
	gst_context_unref (c2);
	}

	GST_END_TEST;

	typedef struct
	{
	GstElement parent;
	gboolean set_before_ready;
	gboolean set_from_need_context;
	gboolean create_self;

	gboolean have_foobar;
	} GstContextElement;

	typedef struct
	{
	GstElementClass parent_class;
	} GstContextElementClass;

	GType gst_context_element_get_type (void);

	G_DEFINE_TYPE (GstContextElement, gst_context_element, GST_TYPE_ELEMENT);

	static void
	gst_context_element_set_context (GstElement * element, GstContext * context)
	{
	if (strcmp (gst_context_get_context_type (context), "foobar") == 0)
	((GstContextElement *) element)->have_foobar = TRUE;

	GST_ELEMENT_CLASS (gst_context_element_parent_class)->set_context (element,
	context);
	}

	static GstStateChangeReturn
	gst_context_element_change_state (GstElement * element,
	GstStateChange transition)
	{
	GstContextElement celement = (GstContextElement ) element;

	if (transition == GST_STATE_CHANGE_NULL_TO_READY) {
	GstContext *context;
	GstMessage *msg;
	gboolean have_foobar = celement->have_foobar;

	if (celement->set_before_ready && !have_foobar)
	return GST_STATE_CHANGE_FAILURE;
	else if (celement->set_before_ready)
	goto chain_up;

	if (celement->set_from_need_context && have_foobar)
	return GST_STATE_CHANGE_FAILURE;

	if (!have_foobar) {
	/* Here we would first query downstream for a context but we have no pads */
	msg = gst_message_new_need_context (GST_OBJECT (element), "foobar");
	gst_element_post_message (element, msg);

	have_foobar = celement->have_foobar;
	}

	if (celement->set_from_need_context && !have_foobar)
	return GST_STATE_CHANGE_FAILURE;
	else if (celement->set_from_need_context)
	goto chain_up;

	if (celement->create_self && have_foobar)
	return GST_STATE_CHANGE_FAILURE;

	if (!have_foobar) {
	context = gst_context_new ("foobar", FALSE);
	gst_element_set_context (element, context);
	msg =
	gst_message_new_have_context (GST_OBJECT (element),
	gst_context_ref (context));
	gst_element_post_message (element, msg);
	gst_context_unref (context);
	}
	}

	chain_up:
	return
	GST_ELEMENT_CLASS (gst_context_element_parent_class)->change_state
	(element, transition);
	}

	static void
	gst_context_element_class_init (GstContextElementClass * klass)
	{
	GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);

	gstelement_class->set_context = gst_context_element_set_context;
	gstelement_class->change_state = gst_context_element_change_state;
	}

	static void
	gst_context_element_init (GstContextElement * self)
	{

	}

	GST_START_TEST (test_element_set_before_ready)
	{
	GstBus *bus;
	GstElement *element;
	GstContext *context;
	GstMessage *msg;

	element = g_object_new (gst_context_element_get_type (), NULL);
	bus = gst_bus_new ();
	gst_element_set_bus (element, bus);

	((GstContextElement *) element)->set_before_ready = TRUE;

	fail_if (gst_element_set_state (element,
	GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);
	fail_if (gst_bus_pop (bus) != NULL);

	context = gst_context_new ("foobar", FALSE);
	gst_element_set_context (element, context);
	fail_unless (gst_element_set_state (element,
	GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);
	fail_unless ((msg =
	gst_bus_pop_filtered (bus, GST_MESSAGE_STATE_CHANGED)) != NULL);
	gst_message_unref (msg);
	fail_if (gst_bus_pop (bus) != NULL);

	fail_unless (((GstContextElement *) element)->have_foobar);

	gst_context_unref (context);

	gst_element_set_bus (element, NULL);
	fail_unless (gst_element_set_state (element,
	GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

	gst_object_unref (bus);
	gst_object_unref (element);
	}

	GST_END_TEST;

	static GstBusSyncReply
	sync_handler (GstBus * bus, GstMessage * message, gpointer user_data)
	{
	if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_NEED_CONTEXT) {
	const gchar *type;
	GstElement *element = GST_ELEMENT (GST_MESSAGE_SRC (message));
	GstContext *context;

	fail_unless (gst_message_parse_context_type (message, &type));
	fail_unless_equals_string (type, "foobar");
	context = gst_context_new ("foobar", FALSE);
	gst_element_set_context (element, context);
	gst_context_unref (context);
	}

	return GST_BUS_PASS;
	}

	GST_START_TEST (test_element_set_from_need_context)
	{
	GstBus *bus;
	GstElement *element;
	GstMessage *msg;

	element = g_object_new (gst_context_element_get_type (), NULL);
	bus = gst_bus_new ();
	gst_bus_set_sync_handler (bus, sync_handler, NULL, NULL);
	gst_element_set_bus (element, bus);

	((GstContextElement *) element)->set_from_need_context = TRUE;

	fail_unless (gst_element_set_state (element,
	GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);
	fail_unless ((msg =
	gst_bus_pop_filtered (bus, GST_MESSAGE_NEED_CONTEXT)) != NULL);
	gst_message_unref (msg);
	fail_unless ((msg =
	gst_bus_pop_filtered (bus, GST_MESSAGE_STATE_CHANGED)) != NULL);
	gst_message_unref (msg);
	fail_if (gst_bus_pop (bus) != NULL);

	fail_unless (((GstContextElement *) element)->have_foobar);

	gst_element_set_bus (element, NULL);
	fail_unless (gst_element_set_state (element,
	GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

	gst_object_unref (bus);
	gst_object_unref (element);
	}

	GST_END_TEST;

	GST_START_TEST (test_element_create_self)
	{
	GstBus *bus;
	GstElement *element;
	GstContext *context;
	GstMessage *msg;

	element = g_object_new (gst_context_element_get_type (), NULL);
	bus = gst_bus_new ();
	gst_element_set_bus (element, bus);

	((GstContextElement *) element)->create_self = TRUE;

	fail_unless (gst_element_set_state (element,
	GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);
	fail_unless ((msg =
	gst_bus_pop_filtered (bus, GST_MESSAGE_NEED_CONTEXT)) != NULL);
	gst_message_unref (msg);
	fail_unless ((msg =
	gst_bus_pop_filtered (bus, GST_MESSAGE_HAVE_CONTEXT)) != NULL);
	gst_message_parse_have_context (msg, &context);
	fail_unless (GST_IS_CONTEXT (context));
	fail_unless_equals_string (gst_context_get_context_type (context), "foobar");
	gst_context_unref (context);
	gst_message_unref (msg);
	fail_unless ((msg =
	gst_bus_pop_filtered (bus, GST_MESSAGE_STATE_CHANGED)) != NULL);
	gst_message_unref (msg);
	fail_if (gst_bus_pop (bus) != NULL);

	fail_unless (((GstContextElement *) element)->have_foobar);

	gst_element_set_bus (element, NULL);
	fail_unless (gst_element_set_state (element,
	GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

	gst_object_unref (bus);
	gst_object_unref (element);
	}

	GST_END_TEST;

	GST_START_TEST (test_element_bin_caching)
	{
	GstBus *bus;
	GstElement *bin;
	GstElement element, element2;

	bin = gst_bin_new (NULL);
	element = g_object_new (gst_context_element_get_type (), NULL);
	element2 = g_object_new (gst_context_element_get_type (), NULL);
	gst_bin_add_many (GST_BIN (bin), element, element2, NULL);

	/* FIXME: This assumes (as currently is true) the GstBin activates
	* the last added element first if none of them is a sink or has pads
	*/
	((GstContextElement *) element2)->create_self = TRUE;
	((GstContextElement *) element)->set_from_need_context = TRUE;

	bus = gst_bus_new ();
	gst_element_set_bus (bin, bus);

	fail_unless (gst_element_set_state (bin,
	GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

	fail_unless (((GstContextElement *) element)->have_foobar);
	fail_unless (((GstContextElement *) element2)->have_foobar);

	gst_element_set_bus (bin, NULL);
	fail_unless (gst_element_set_state (bin,
	GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

	gst_object_unref (bus);
	gst_object_unref (bin);
	}

	GST_END_TEST;

	GST_START_TEST (test_add_element_to_bin)
	{
	GstBus *bus;
	GstElement *bin;
	GstElement *element;
	GList contexts, contexts2, *l;

	/* Start with an element not inside a bin requesting a context. Add the
	* element to a bin and check the context propagation. */
	element = g_object_new (gst_context_element_get_type (), NULL);

	((GstContextElement *) element)->create_self = TRUE;

	fail_unless (gst_element_set_state (element,
	GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

	fail_unless (((GstContextElement *) element)->have_foobar);

	bin = gst_bin_new (NULL);

	bus = gst_bus_new ();
	gst_element_set_bus (bin, bus);

	fail_unless (gst_element_set_state (bin,
	GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

	gst_bin_add (GST_BIN (bin), element);

	/* check the contexts are the same */
	contexts = gst_element_get_contexts (element);
	contexts2 = gst_element_get_contexts (bin);
	for (l = contexts; l; l = l->next)
	fail_unless (g_list_find (contexts2, l->data));
	g_list_free_full (contexts, (GDestroyNotify) gst_context_unref);
	g_list_free_full (contexts2, (GDestroyNotify) gst_context_unref);

	gst_element_set_bus (bin, NULL);
	fail_unless (gst_element_set_state (bin,
	GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

	gst_object_unref (bus);
	gst_object_unref (bin);
	}

	GST_END_TEST;

	GST_START_TEST (test_add_element_to_bin_collision)
	{
	GstBus *bus;
	GstElement *bin;
	GstElement element, element2;
	GList contexts, contexts2, *l;

	/* Start with a bin containing an element that requests a context and then add
	* another element to the bin that has already requested the same context. */

	bin = gst_bin_new (NULL);
	element = g_object_new (gst_context_element_get_type (), NULL);
	gst_bin_add (GST_BIN (bin), element);

	((GstContextElement *) element)->create_self = TRUE;

	bus = gst_bus_new ();
	gst_element_set_bus (bin, bus);

	fail_unless (gst_element_set_state (bin,
	GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

	fail_unless (((GstContextElement *) element)->have_foobar);

	/* propagate a context without a parent bin */
	element2 = g_object_new (gst_context_element_get_type (), NULL);
	((GstContextElement *) element2)->create_self = TRUE;

	fail_unless (gst_element_set_state (element2,
	GST_STATE_READY) == GST_STATE_CHANGE_SUCCESS);

	fail_unless (((GstContextElement *) element2)->have_foobar);

	((GstContextElement *) element)->have_foobar = FALSE;
	((GstContextElement *) element2)->have_foobar = FALSE;

	/* add element to bin should result in the propagation of contexts to the
	* added element */
	gst_bin_add (GST_BIN (bin), element2);

	fail_unless (((GstContextElement *) element)->have_foobar == FALSE);
	fail_unless (((GstContextElement *) element2)->have_foobar);

	/* check the contexts are the same */
	contexts = gst_element_get_contexts (element);
	contexts2 = gst_element_get_contexts (element2);
	for (l = contexts; l; l = l->next)
	fail_unless (g_list_find (contexts2, l->data));
	g_list_free_full (contexts, (GDestroyNotify) gst_context_unref);
	contexts = gst_element_get_contexts (bin);
	for (l = contexts; l; l = l->next)
	fail_unless (g_list_find (contexts2, l->data));
	g_list_free_full (contexts, (GDestroyNotify) gst_context_unref);
	g_list_free_full (contexts2, (GDestroyNotify) gst_context_unref);

	gst_element_set_bus (bin, NULL);
	fail_unless (gst_element_set_state (bin,
	GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS);

	gst_object_unref (bus);
	gst_object_unref (bin);
	}

	GST_END_TEST;

	static Suite *
	gst_context_suite (void)
	{
	Suite *s = suite_create ("GstContext");
	TCase *tc_chain = tcase_create ("context tests");

	tcase_set_timeout (tc_chain, 0);

	suite_add_tcase (s, tc_chain);
	tcase_add_test (tc_chain, test_basic);
	tcase_add_test (tc_chain, test_element_set_before_ready);
	tcase_add_test (tc_chain, test_element_set_from_need_context);
	tcase_add_test (tc_chain, test_element_create_self);
	tcase_add_test (tc_chain, test_element_bin_caching);
	tcase_add_test (tc_chain, test_add_element_to_bin);
	tcase_add_test (tc_chain, test_add_element_to_bin_collision);

	return s;
	}

	GST_CHECK_MAIN (gst_context);