[gtk/flatten-fail] add a test for flattening list model

[Matthias Clasen <matthiasc src gnome org>]

commit 456e928ca1650b64aa3c56a9185c4d0dea831a2a
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jul 1 23:57:20 2019 +0000

    add a test for flattening list model
    
    This one was observed while playing with
    list models for constraints and guides.

 testsuite/gtk/flattenlistmodel.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
---
diff --git a/testsuite/gtk/flattenlistmodel.c b/testsuite/gtk/flattenlistmodel.c
index 94de2490ef..79921e5042 100644
--- a/testsuite/gtk/flattenlistmodel.c
+++ b/testsuite/gtk/flattenlistmodel.c
@@ -300,6 +300,44 @@ test_submodel_add (void)
   g_object_unref (flat);
 }
 
+static void
+test_submodel_add2 (void)
+{
+  GtkFlattenListModel *flat;
+  GListStore *model, *store[2];
+
+  model = g_list_store_new (G_TYPE_LIST_MODEL);
+  flat = new_model (model);
+  assert_model (flat, "");
+  assert_changes (flat, "");
+
+  store[0] = add_store (model, 1, 0, 0);
+  store[1] = add_store (model, 1, 0, 0);
+  store[2] = add_store (model, 1, 0, 0);
+
+  assert_model (flat, "");
+  assert_changes (flat, "");
+
+  add (store[0], 1);
+  assert_model (flat, "1");
+  assert_changes (flat, "+0");
+
+  add (store[1], 3);
+  assert_model (flat, "1 3");
+  assert_changes (flat, "+1");
+
+  add (store[0], 2);
+  assert_model (flat, "1 2 3");
+  assert_changes (flat, "+1");
+
+  add (store[1], 4);
+  assert_model (flat, "1 2 3 4");
+  assert_changes (flat, "+3");
+
+  g_object_unref (model);
+  g_object_unref (flat);
+}
+
 static void
 test_model_remove (void)
 {
@@ -365,6 +403,7 @@ main (int argc, char *argv[])
   g_test_add_func ("/flattenlistmodel/model/add", test_model_add);
 #if GLIB_CHECK_VERSION (2, 58, 0) /* g_list_store_splice() is broken before 2.58 */
   g_test_add_func ("/flattenlistmodel/submodel/add", test_submodel_add);
+  g_test_add_func ("/flattenlistmodel/submodel/add2", test_submodel_add2);
   g_test_add_func ("/flattenlistmodel/model/remove", test_model_remove);
   g_test_add_func ("/flattenlistmodel/submodel/remove", test_submodel_remove);
 #endif