[gtk/test-coverage: 1/8] Add some tests for the listlistmodel

[Matthias Clasen <matthiasc src gnome org>]

commit f8f669b8958e02649d3acdbec9b1cf5b17d9487a
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jul 14 22:51:13 2022 -0400

    Add some tests for the listlistmodel

 testsuite/gtk/listlistmodel.c | 126 ++++++++++++++++++++++++++++++++++++++++++
 testsuite/gtk/meson.build     |   1 +
 2 files changed, 127 insertions(+)
---
diff --git a/testsuite/gtk/listlistmodel.c b/testsuite/gtk/listlistmodel.c
new file mode 100644
index 0000000000..7d1f25aa35
--- /dev/null
+++ b/testsuite/gtk/listlistmodel.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2022, 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 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/>.
+ */
+
+#include <locale.h>
+
+#include <gtk/gtk.h>
+
+static GQuark changes_quark;
+
+static void
+items_changed_cb (GListModel *model,
+                  guint       position,
+                  guint       removed,
+                  guint       added)
+{
+  GString *changes;
+
+  g_assert_true (removed != 0 || added != 0);
+
+  changes = g_object_get_qdata (G_OBJECT (model), changes_quark);
+
+  if (changes->len)
+    g_string_append (changes, ", ");
+
+  if (removed == 1 && added == 0)
+    {
+      g_string_append_printf (changes, "-%u", position);
+    }
+  else if (removed == 0 && added == 1)
+    {
+      g_string_append_printf (changes, "+%u", position);
+    }
+  else
+    {
+      g_string_append_printf (changes, "%u", position);
+      if (removed > 0)
+        g_string_append_printf (changes, "-%u", removed);
+      if (added > 0)
+        g_string_append_printf (changes, "+%u", added);
+    }
+}
+
+#define assert_changes(model, expected) G_STMT_START{ \
+  GString *changes = g_object_get_qdata (G_OBJECT (model), changes_quark); \
+  if (!g_str_equal (changes->str, expected)) \
+     g_assertion_message_cmpstr (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
+         #model " == " #expected, changes->str, "==", expected); \
+  g_string_set_size (changes, 0); \
+}G_STMT_END
+
+static void
+free_changes (gpointer data)
+{
+  GString *s = data;
+
+  g_string_free (s, TRUE);
+}
+
+static void
+test_list_list_model (void)
+{
+  GtkWidget *box;
+  GListModel *model;
+  GtkWidget *a, *b;
+  GObject *item;
+  guint n_items;
+
+  box = g_object_ref_sink (gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0));
+
+  model = gtk_widget_observe_children (box);
+  g_assert_true (g_list_model_get_item_type (model) == G_TYPE_OBJECT);
+
+  g_assert_true (g_list_model_get_n_items (model) == 0);
+  g_assert_true (g_list_model_get_item (model, 0) == NULL);
+
+  g_object_set_qdata_full (G_OBJECT (model), changes_quark, g_string_new (""), free_changes);
+
+  g_signal_connect (model, "items-changed", G_CALLBACK (items_changed_cb), NULL);
+  a = gtk_label_new ("a");
+  b = gtk_label_new ("b");
+  gtk_box_append (GTK_BOX (box), a);
+  gtk_box_append (GTK_BOX (box), b);
+
+  item = g_list_model_get_item (model, 0);
+  g_assert_true (GTK_WIDGET (item) == a);
+  g_object_unref (item);
+  item = g_list_model_get_item (model, 1);
+  g_assert_true (GTK_WIDGET (item) == b);
+  g_object_unref (item);
+
+  assert_changes (model, "+0, +1");
+
+  g_object_get (model, "n-items", &n_items, NULL);
+  g_assert_true (n_items == 2);
+
+  g_object_unref (model);
+  g_object_unref (box);
+}
+
+int
+main (int argc, char *argv[])
+{
+  (g_test_init) (&argc, &argv, NULL);
+  gtk_init ();
+  setlocale (LC_ALL, "C");
+
+  changes_quark = g_quark_from_static_string ("What did I see? Can I believe what I saw?");
+
+  g_test_add_func ("/listlistmodel/change", test_list_list_model);
+
+  return g_test_run ();
+}
diff --git a/testsuite/gtk/meson.build b/testsuite/gtk/meson.build
index fcf85ce509..4dd9e494fe 100644
--- a/testsuite/gtk/meson.build
+++ b/testsuite/gtk/meson.build
@@ -54,6 +54,7 @@ tests = [
   { 'name': 'icontheme' },
   { 'name': 'label' },
   { 'name': 'listbox' },
+  { 'name': 'listlistmodel' },
   { 'name': 'main' },
   { 'name': 'maplistmodel' },
   { 'name': 'multiselection' },