[dconf/wip/reorg: 491/498] tests/: add a testcase for DConfClient

[Ryan Lortie <ryanl src gnome org>]

commit 53ed572bd103feacbbd645f3d4c117b2b5fc9c31
Author: Ryan Lortie <desrt desrt ca>
Date:   Fri Jul 6 00:00:33 2012 -0400

    tests/: add a testcase for DConfClient

 tests/.gitignore               |    1 +
 tests/Makefile.am              |    4 +
 tests/client.c                 |  179 ++++++++++++++++++++++++++++++++++++++++
 tests/profile/will-never-exist |    1 +
 4 files changed, 185 insertions(+), 0 deletions(-)
---
diff --git a/tests/.gitignore b/tests/.gitignore
index fcafc43..a1afa6d 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -1,5 +1,6 @@
 libdconf-dbus-stub.a
 
+client
 dbus1
 engine
 gdbus-filter
diff --git a/tests/Makefile.am b/tests/Makefile.am
index f4f374a..7fded6b 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -56,3 +56,7 @@ gdbus_filter_SOURCES = \
 TEST_PROGS += engine
 engine_LDADD = $(engine_with_stub_LIBS) $(glib_LIBS)
 engine_SOURCES = engine.c
+
+TEST_PROGS += client
+client_LDADD = $(stub_client_LIBS) $(gio_LIBS)
+client_SOURCES = client.c
diff --git a/tests/client.c b/tests/client.c
new file mode 100644
index 0000000..1891db4
--- /dev/null
+++ b/tests/client.c
@@ -0,0 +1,179 @@
+#define _BSD_SOURCE
+#include <dconf-client.h>
+#include <dconf-engine.h>
+#include <string.h>
+#include <stdlib.h>
+
+extern GQueue outstanding_call_handles;
+static GThread *main_thread;
+
+static void
+test_lifecycle (void)
+{
+  DConfClient *client;
+  GWeakRef weak;
+
+  client = dconf_client_new ();
+  g_weak_ref_init (&weak, client);
+  g_object_unref (client);
+
+  g_assert (g_weak_ref_get (&weak) == NULL);
+  g_weak_ref_clear (&weak);
+}
+
+static gboolean changed_was_called;
+
+static void
+changed (DConfClient         *client,
+         const gchar         *prefix,
+         const gchar * const *changes,
+         const gchar         *tag,
+         gpointer             user_data)
+{
+  g_assert (g_thread_self () == main_thread);
+
+  changed_was_called = TRUE;
+}
+
+static void
+check_and_free (GVariant *to_check,
+                GVariant *expected)
+{
+  if (expected)
+    {
+      g_variant_ref_sink (expected);
+      g_assert (to_check);
+
+      g_assert (g_variant_equal (to_check, expected));
+      g_variant_unref (to_check);
+      g_variant_unref (expected);
+    }
+  else
+    g_assert (to_check == NULL);
+}
+
+static void
+queue_up_100_writes (DConfClient *client)
+{
+  gint i;
+
+  /* We send 100 writes, letting them pile up.
+   * At no time should there be more than 2 writes on the wire.
+   */
+  for (i = 0; i < 100; i++)
+    {
+      changed_was_called = FALSE;
+      dconf_client_write_fast (client, "/test/value", g_variant_new_int32 (i), NULL);
+      g_assert (changed_was_called);
+
+      /* We should always see the most recently written value. */
+      check_and_free (dconf_client_read (client, "/test/value"), g_variant_new_int32 (i));
+    }
+
+  g_assert_cmpint (g_queue_get_length (&outstanding_call_handles), ==, 2);
+}
+
+static void
+fail_one_call (void)
+{
+  DConfEngineCallHandle *handle;
+  GError *error;
+
+  error = g_error_new_literal (G_FILE_ERROR, G_FILE_ERROR_NOENT, "--expected error from testcase--");
+  handle = g_queue_pop_head (&outstanding_call_handles);
+  dconf_engine_call_handle_reply (handle, NULL, error);
+  g_error_free (error);
+}
+
+static void
+log_handler (const gchar    *log_domain,
+             GLogLevelFlags  log_level,
+             const gchar    *message,
+             gpointer        user_data)
+{
+  if (strstr (message, "--expected error from testcase--"))
+    return;
+
+  g_log_default_handler (log_domain, log_level, message, user_data);
+}
+
+static gboolean
+fatal_log_handler (const gchar    *log_domain,
+                   GLogLevelFlags  log_level,
+                   const gchar    *message,
+                   gpointer        user_data)
+{
+  if (strstr (message, "--expected error from testcase--"))
+    return FALSE;
+
+  return TRUE;
+}
+
+static void
+test_fast (void)
+{
+  DConfClient *client;
+  gint i;
+
+  g_log_set_default_handler (log_handler, NULL);
+  g_test_log_set_fatal_handler (fatal_log_handler, NULL);
+
+  client = dconf_client_new ();
+  g_signal_connect (client, "changed", G_CALLBACK (changed), NULL);
+
+  queue_up_100_writes (client);
+
+  /* Start indicating that the writes failed.
+   *
+   * For the first failures, we should continue to see the most recently
+   * written value (99).
+   *
+   * After we fail that last one, we should see NULL returned.
+   *
+   * Each time, we should see a change notify.
+   */
+
+  for (i = 0; g_queue_get_length (&outstanding_call_handles) > 1; i++)
+    {
+      changed_was_called = FALSE;
+      fail_one_call ();
+      g_assert (changed_was_called);
+
+      check_and_free (dconf_client_read (client, "/test/value"), g_variant_new_int32 (99));
+    }
+
+  /* Because of the pending-merging logic, we should only have had to
+   * fail two calls.
+   */
+  g_assert (i == 2);
+
+  /* Fail the last call. */
+  changed_was_called = FALSE;
+  fail_one_call ();
+  g_assert (changed_was_called);
+
+  /* Should read back now as NULL */
+  check_and_free (dconf_client_read (client, "/test/value"), NULL);
+
+  /* Cleanup */
+  g_signal_handlers_disconnect_by_func (client, changed, NULL);
+  g_object_unref (client);
+}
+
+int
+main (int argc, char **argv)
+{
+  setenv ("DCONF_PROFILE", SRCDIR "/profile/will-never-exist", TRUE);
+
+  main_thread = g_thread_self ();
+
+
+  g_test_init (&argc, &argv, NULL);
+
+  g_type_init ();
+
+  g_test_add_func ("/client/lifecycle", test_lifecycle);
+  g_test_add_func ("/client/basic-fast", test_fast);
+
+  return g_test_run ();
+}
diff --git a/tests/profile/will-never-exist b/tests/profile/will-never-exist
new file mode 100644
index 0000000..bcff7a6
--- /dev/null
+++ b/tests/profile/will-never-exist
@@ -0,0 +1 @@
+user-db:will-never-exist