diff --git a/testsuite/gsk/boundingbox.c b/testsuite/gsk/boundingbox.c
new file mode 100644
index 0000000000..52169d3979
--- /dev/null
+++ b/testsuite/gsk/boundingbox.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright © 2023 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Matthias Clasen <mclasen@redhat.com>
+ */
+
+#include <gtk/gtk.h>
+#include <gsk/gskboundingboxprivate.h>
+
+static void
+init_random_rect (graphene_rect_t *r)
+{
+  r->origin.x = g_test_rand_double_range (0, 1000);
+  r->origin.y = g_test_rand_double_range (0, 1000);
+  r->size.width = g_test_rand_double_range (0, 1000);
+  r->size.height = g_test_rand_double_range (0, 1000);
+}
+
+static void
+test_to_rect (void)
+{
+  graphene_rect_t rect, rect2;
+  GskBoundingBox bb;
+  graphene_point_t p, p2;
+
+  for (unsigned int i = 0; i < 100; i++)
+    {
+      init_random_rect (&rect);
+
+      gsk_bounding_box_init_from_rect (&bb, &rect);
+      gsk_bounding_box_to_rect (&bb, &rect2);
+
+      graphene_rect_get_top_left (&rect, &p);
+      graphene_rect_get_top_left (&rect2, &p2);
+
+      /* Note: that we can't assert equality here is the reason
+       * GskBoundingBox exists.
+       */
+      g_assert_true (graphene_point_near (&p, &p2, 0.001));
+
+      graphene_rect_get_bottom_right (&rect, &p);
+      graphene_rect_get_bottom_right (&rect2, &p2);
+
+      g_assert_true (graphene_point_near (&p, &p2, 0.001));
+    }
+}
+
+static void
+test_contains (void)
+{
+  graphene_rect_t rect;
+  GskBoundingBox bb;
+  graphene_point_t p;
+
+  for (unsigned int i = 0; i < 100; i++)
+    {
+      init_random_rect (&rect);
+
+      gsk_bounding_box_init_from_rect (&bb, &rect);
+
+      g_assert_true (gsk_bounding_box_contains_point (&bb, &bb.min));
+      g_assert_true (gsk_bounding_box_contains_point (&bb, &bb.max));
+
+      graphene_point_interpolate (&bb.min, &bb.max, 0.5, &p);
+      g_assert_true (gsk_bounding_box_contains_point (&bb, &p));
+    }
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  gtk_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/bounding-box/to-rect", test_to_rect);
+  g_test_add_func ("/bounding-box/contains", test_contains);
+
+  return g_test_run ();
+}
diff --git a/testsuite/gsk/meson.build b/testsuite/gsk/meson.build
index e48e9a3a45..9e104e664e 100644
--- a/testsuite/gsk/meson.build
+++ b/testsuite/gsk/meson.build
@@ -393,6 +393,7 @@ internal_tests = [
   [ 'half-float' ],
   ['rounded-rect'],
   ['misc'],
+  ['boundingbox'],
 ]
 
 foreach t : internal_tests