Moved all tests to tests folder

tests/unittests/test_preferences.c

@@ -0,0 +1,33 @@
+#include <stdarg.h>
+#include <stddef.h>
+#include <setjmp.h>
+#include <cmocka.h>
+#include <stdlib.h>
+#include <string.h>
+#include <glib.h>
+
+#include "config/preferences.h"
+
+void statuses_console_defaults_to_all(void **state)
+{
+    char *setting = prefs_get_string(PREF_STATUSES_CONSOLE);
+
+    assert_non_null(setting);
+    assert_string_equal("all", setting);
+}
+
+void statuses_chat_defaults_to_all(void **state)
+{
+    char *setting = prefs_get_string(PREF_STATUSES_CHAT);
+
+    assert_non_null(setting);
+    assert_string_equal("all", setting);
+}
+
+void statuses_muc_defaults_to_all(void **state)
+{
+    char *setting = prefs_get_string(PREF_STATUSES_MUC);
+
+    assert_non_null(setting);
+    assert_string_equal("all", setting);
+}