diff --git a/gtk/gtktestutils.c b/gtk/gtktestutils.c
index 78bb2586fb..7973b0230f 100644
--- a/gtk/gtktestutils.c
+++ b/gtk/gtktestutils.c
@@ -219,6 +219,8 @@ gtk_test_widget_send_key (GtkWidget      *widget,
  * Returns: whether all actions neccessary for the button click simulation were carried out successfully.
  *
  * Since: 2.14
+ *
+ * Deprecated: 3.20: This testing infrastructure is phased out in favor of reftests.
  **/
 gboolean
 gtk_test_widget_click (GtkWidget      *widget,
@@ -250,6 +252,8 @@ gtk_test_widget_click (GtkWidget      *widget,
  * Returns: whether all actions neccessary for the button click simulation were carried out successfully.
  *
  * Since: 2.14
+ *
+ * Deprecated: 3.20: This testing infrastructure is phased out in favor of reftests.
  **/
 gboolean
 gtk_test_spin_button_click (GtkSpinButton  *spinner,
@@ -464,6 +468,8 @@ gtk_test_find_widget (GtkWidget    *widget,
  * @percentage argument.
  *
  * Since: 2.14
+ *
+ * Deprecated: 3.20: This testing infrastructure is phased out in favor of reftests.
  **/
 void
 gtk_test_slider_set_perc (GtkWidget      *widget,
@@ -496,6 +502,8 @@ gtk_test_slider_set_perc (GtkWidget      *widget,
  * Returns: gtk_adjustment_get_value (adjustment) for an adjustment belonging to @widget.
  *
  * Since: 2.14
+ *
+ * Deprecated: 3.20: This testing infrastructure is phased out in favor of reftests.
  **/
 double
 gtk_test_slider_get_value (GtkWidget *widget)
@@ -517,6 +525,8 @@ gtk_test_slider_get_value (GtkWidget *widget)
  * GtkEditable (entry and text widgets) or GtkTextView.
  *
  * Since: 2.14
+ *
+ * Deprecated: 3.20: This testing infrastructure is phased out in favor of reftests.
  **/
 void
 gtk_test_text_set (GtkWidget   *widget,
@@ -547,6 +557,8 @@ gtk_test_text_set (GtkWidget   *widget,
  * Returns: new 0-terminated C string, needs to be released with g_free().
  *
  * Since: 2.14
+ *
+ * Deprecated: 3.20: This testing infrastructure is phased out in favor of reftests.
  **/
 gchar*
 gtk_test_text_get (GtkWidget *widget)
@@ -583,6 +595,8 @@ gtk_test_text_get (GtkWidget *widget)
  * Returns: (transfer none): a newly created widget.
  *
  * Since: 2.14
+ *
+ * Deprecated: 3.20: This testing infrastructure is phased out in favor of reftests.
  */
 GtkWidget*
 gtk_test_create_widget (GType        widget_type,
@@ -641,6 +655,8 @@ test_increment_intp (int *intp)
  * Returns: (transfer full): a widget pointer to the newly created GtkWindow.
  *
  * Since: 2.14
+ *
+ * Deprecated: 3.20: This testing infrastructure is phased out in favor of reftests.
  **/
 GtkWidget*
 gtk_test_display_button_window (const gchar *window_title,
@@ -683,6 +699,8 @@ gtk_test_display_button_window (const gchar *window_title,
  * Returns: (transfer none): a widget pointer to the newly created GtkWindow.
  *
  * Since: 2.14
+ *
+ * Deprecated: 3.20: This testing infrastructure is phased out in favor of reftests.
  **/
 GtkWidget*
 gtk_test_create_simple_window (const gchar *window_title,
diff --git a/gtk/gtktestutils.h b/gtk/gtktestutils.h
index badbd1f372..bdf2515fcc 100644
--- a/gtk/gtktestutils.h
+++ b/gtk/gtktestutils.h
@@ -41,29 +41,29 @@ GDK_AVAILABLE_IN_ALL
 GtkWidget*      gtk_test_find_widget            (GtkWidget      *widget,
                                                  const gchar    *label_pattern,
                                                  GType           widget_type);
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_20
 GtkWidget*      gtk_test_create_widget          (GType           widget_type,
                                                  const gchar    *first_property_name,
                                                  ...);
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_20
 GtkWidget*      gtk_test_create_simple_window   (const gchar    *window_title,
                                                  const gchar    *dialog_text);
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_20
 GtkWidget*      gtk_test_display_button_window  (const gchar    *window_title,
                                                  const gchar    *dialog_text,
                                                  ...); /* NULL terminated list of (label, &int) pairs */
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_20
 void            gtk_test_slider_set_perc        (GtkWidget      *widget, /* GtkRange-alike */
                                                  double          percentage);
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_20
 double          gtk_test_slider_get_value       (GtkWidget      *widget);
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_20
 gboolean        gtk_test_spin_button_click      (GtkSpinButton  *spinner,
                                                  guint           button,
                                                  gboolean        upwards);
 GDK_AVAILABLE_IN_3_10
 void            gtk_test_widget_wait_for_draw   (GtkWidget      *widget);
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_20
 gboolean        gtk_test_widget_click           (GtkWidget      *widget,
                                                  guint           button,
                                                  GdkModifierType modifiers);
@@ -72,10 +72,10 @@ gboolean        gtk_test_widget_send_key        (GtkWidget      *widget,
                                                  guint           keyval,
                                                  GdkModifierType modifiers);
 /* operate on GtkEntry, GtkText, GtkTextView or GtkLabel */
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_20
 void            gtk_test_text_set               (GtkWidget      *widget,
                                                  const gchar    *string);
-GDK_AVAILABLE_IN_ALL
+GDK_DEPRECATED_IN_3_20
 gchar*          gtk_test_text_get               (GtkWidget      *widget);
 
 /* --- Gtk+ Test low-level API --- */