[calls] tests: Add testing for sideeffects of using CallsSettings

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit e052201553b9d36e7dfd7e5d21bf78a869bab5c1
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Wed May 11 09:54:13 2022 +0200

    tests: Add testing for sideeffects of using CallsSettings
    
    When setting up a binding between GSettings and GObject properties the
    CallsSetting used to set the value from the GSetting to the property and
    back to the GSetting.
    
    While the value was still the default value it was marked as non default
    because it had explicitly been set without any user interaction.

 tests/meson.build     | 13 +++++++++++++
 tests/test-settings.c | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)
---
diff --git a/tests/meson.build b/tests/meson.build
index a2335e5b..9171ce82 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -193,4 +193,17 @@ t = executable('contacts', test_sources,
                )
 test('contacts', t, env: test_env)
 
+test_sources = [ 'test-settings.c' ]
+t = executable('settings', test_sources,
+               c_args : test_cflags,
+               link_args: test_link_args,
+               pie: true,
+               link_with : [calls_vala, libcalls],
+               dependencies: calls_deps,
+               include_directories : [
+                   calls_includes,
+                 ]
+               )
+test('settings', t, env: test_env)
+
 endif
diff --git a/tests/test-settings.c b/tests/test-settings.c
new file mode 100644
index 00000000..4934d011
--- /dev/null
+++ b/tests/test-settings.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2022 Purism SPC
+ *
+ * SPDX-License-Identifier: GPL-3.0+
+ */
+
+#include "calls-settings.h"
+
+#define G_SETTINGS_ENABLE_BACKEND
+#include <gio/gsettingsbackend.h>
+
+#include <gtk/gtk.h>
+
+static void
+test_default (void)
+{
+  g_autoptr (GSettings) gsettings = g_settings_new ("org.gnome.Calls");
+  g_autoptr (CallsSettings) calls_settings = NULL;
+
+  g_assert_null (g_settings_get_user_value (gsettings, "autoload-plugins"));
+  g_assert_null (g_settings_get_user_value (gsettings, "preferred-audio-codecs"));
+
+  /* we're testing if CallsSettings has the sideeffect of writing to the settings */
+  calls_settings = calls_settings_get_default ();
+
+  g_assert_null (g_settings_get_user_value (gsettings, "autoload-plugins"));
+  g_assert_null (g_settings_get_user_value (gsettings, "preferred-audio-codecs"));
+}
+
+
+int
+main (gint   argc,
+      gchar *argv[])
+{
+  gtk_test_init (&argc, &argv, NULL);
+
+  g_test_add_func ("/Calls/Settings/default", test_default);
+
+  return g_test_run ();
+}