gtk: Improve test coverage

testsuite/gtk/border.c

@@ -0,0 +1,27 @@
+#include <gtk/gtk.h>
+
+static void
+test_border_basic (void)
+{
+  GtkBorder *border;
+  GtkBorder *border2;
+
+  border = gtk_border_new ();
+  *border = (GtkBorder) { 5, 6, 666, 777 };
+  border2 = gtk_border_copy (border);
+
+  g_assert_true (memcmp (border, border2, sizeof (GtkBorder)) == 0);
+
+  gtk_border_free (border);
+  gtk_border_free (border2);
+}
+
+int
+main (int argc, char *argv[])
+{
+  gtk_test_init (&argc, &argv);
+
+  g_test_add_func ("/border/basic", test_border_basic);
+
+  return g_test_run ();
+}

testsuite/gtk/meson.build

@@ -26,6 +26,7 @@ tests = [
   { 'name': 'action' },
   { 'name': 'adjustment' },
   { 'name': 'bitset' },
+  { 'name': 'border' },
   {
     'name': 'builder',
     'link_args': gtk_tests_export_dynamic_ldflag,