tests: Add skeleton DBus API client test suite

tests/meson.build

@@ -133,4 +133,17 @@ t = executable('settings', test_sources,
                )
 test('settings', t, env: test_env)
 
+test_sources = ['test-dbus.c']
+t = executable('dbus', test_sources, generated_dbus_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('dbus', t, env: test_env)
+
 endif

tests/test-dbus.c

@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2023 Purism SPC
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * Author: Evangelos Ribeiro Tzaras <devrtz@fortysixandtwo.eu>
+ */
+
+#include "calls-dbus-config.h"
+
+#include "calls-call-dbus.h"
+
+#include <gtk/gtk.h>
+
+
+/* returns the PID of the process owning the given name on the session bus, or -1 if not found */
+static int
+find_pid_by_bus_name (const char *name)
+{
+  g_autoptr (GError) error = NULL;
+  g_autoptr (GDBusProxy) proxy =
+    g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SESSION,
+                                   G_DBUS_PROXY_FLAGS_NONE,
+                                   NULL,
+                                   "org.freedesktop.DBus",
+                                   "/org/freesktop/DBus",
+                                   "org.freedesktop.DBus",
+                                   NULL,
+                                   &error);
+  g_autoptr (GVariant) ret = NULL;
+  guint32 pid;
+
+  g_assert_nonnull (proxy);
+  g_assert_no_error (error);
+
+  ret = g_dbus_proxy_call_sync (proxy,
+                                "GetConnectionUnixProcessID",
+                                g_variant_new ("(s)", name),
+                                G_DBUS_CALL_FLAGS_NONE,
+                                5000,
+                                NULL,
+                                &error);
+
+  g_assert_no_error (error);
+
+  g_variant_get (ret, "(u)", &pid);
+
+  return pid;
+}
+
+
+typedef struct {
+  GTestDBus          *dbus;
+  GDBusObjectManager *calls_manager;
+  GMainLoop          *loop;
+  guint32             pid_server;
+} DBusTestFixture;
+
+
+static void
+fixture_setup (DBusTestFixture *fixture, gconstpointer unused)
+{
+  g_autoptr (GError) error = NULL;
+
+  g_setenv ("GSETTINGS_BACKEND", "memory", TRUE);
+
+  fixture->loop = g_main_loop_new (NULL, FALSE);
+  fixture->dbus = g_test_dbus_new (G_TEST_DBUS_NONE);
+
+  g_test_dbus_add_service_dir (fixture->dbus, CALLS_BUILD_DIR_STR "/tests/services");
+  g_test_dbus_up (fixture->dbus);
+
+  fixture->calls_manager =
+    calls_dbus_object_manager_client_new_for_bus_sync (G_BUS_TYPE_SESSION,
+                                                       G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_NONE,
+                                                       CALLS_DBUS_NAME,
+                                                       CALLS_DBUS_OBJECT_PATH,
+                                                       NULL,
+                                                       &error);
+
+  if (fixture->calls_manager == NULL)
+    g_error ("Error getting object manager client: %s", error->message);
+
+  fixture->pid_server = find_pid_by_bus_name (CALLS_DBUS_NAME);
+}
+
+
+static void
+fixture_teardown (DBusTestFixture *fixture, gconstpointer unused)
+{
+  g_assert_finalize_object (fixture->calls_manager);
+
+  g_test_dbus_down (fixture->dbus);
+  g_clear_object (&fixture->dbus);
+
+  g_clear_pointer (&fixture->loop, g_main_loop_unref);
+}
+
+
+static void
+test_no_calls (DBusTestFixture *fixture, gconstpointer unused)
+{
+  GList *objects;
+
+  g_assert_cmpint (fixture->pid_server, >, 0);
+
+  objects = g_dbus_object_manager_get_objects (fixture->calls_manager);
+
+  g_assert_cmpint (g_list_length (objects), ==, 0);
+  g_clear_list (&objects, g_object_unref);
+}
+
+
+int
+main (int   argc,
+      char *argv[])
+{
+  gtk_test_init (&argc, &argv, NULL);
+
+  g_test_add ("/Calls/DBus/no_calls", DBusTestFixture, NULL,
+              fixture_setup, test_no_calls, fixture_teardown);
+
+  g_test_run ();
+}