Add test to check object lifecycle bugs easily

Further tests will need mocks for phosh.c

meson_options.txt

+option('tests',
+       type: 'boolean', value: true,
+       description: 'Whether to compile unit tests')

tests/meson.build

+if get_option('tests')
+
+test_env = [
+  'G_TEST_SRCDIR=@0@'.format(meson.current_source_dir()),
+  'G_TEST_BUILDDIR=@0@'.format(meson.current_build_dir()),
+  'G_DEBUG=gc-friendly,fatal-warnings',
+  'GSETTINGS_BACKEND=memory',
+  'GSETTINGS_SCHEMA_DIR=@0@/data'.format(meson.build_root()),
+  'PYTHONDONTWRITEBYTECODE=yes',
+  'MALLOC_CHECK_=2',
+]
+
+test_cflags = [
+  '-fPIE',
+  '-I../src'.format(meson.current_source_dir()),
+  '-DTEST_DATA_DIR="@0@/data"'.format(meson.current_source_dir()),
+]
+
+test_link_args = [
+  '-fPIC',
+]
+
+cls_names = [
+  'favorites',
+]
+
+foreach cls_name : cls_names
+  t = executable('test-@0@'.format(cls_name),
+		 ['test-@0@.c'.format(cls_name),
+		  '../src/@0@.c'.format(cls_name)],
+		 c_args: test_cflags,
+		 link_args: test_link_args,
+		 dependencies: phosh_deps,
+		)
+  test(cls_name, t, env: test_env)
+endforeach
+
+endif

tests/test-favorites.c

+/*
+ * Copyright (C) 2018 Purism SPC
+ * SPDX-License-Identifier: GPL-3.0+
+ * Author: Guido Günther <agx@sigxcpu.org>
+ */
+
+#include "favorites.h"
+
+static void
+test_phosh_favorites_new(void)
+{
+  GtkWidget *window = phosh_favorites_new ();
+  g_assert (window);
+  gtk_widget_destroy (window);
+}
+
+
+gint
+main (gint argc,
+      gchar *argv[])
+{
+  gtk_test_init (&argc, &argv, NULL);
+
+  g_test_add_func("/phosh/favorites/new", test_phosh_favorites_new);
+  return g_test_run();
+}