diff --git a/tests/core/string/test_translation_server.h b/tests/core/string/test_translation_server.h
new file mode 100644
index 00000000000..2c20574309e
--- /dev/null
+++ b/tests/core/string/test_translation_server.h
@@ -0,0 +1,136 @@
+/**************************************************************************/
+/*  test_translation_server.h                                             */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#ifndef TEST_TRANSLATION_SERVER_H
+#define TEST_TRANSLATION_SERVER_H
+
+#include "core/string/translation.h"
+
+#include "tests/test_macros.h"
+
+namespace TestTranslationServer {
+TEST_CASE("[TranslationServer] Translation operations") {
+	Ref<Translation> t = memnew(Translation);
+	t->set_locale("uk");
+	t->add_message("Good Morning", String::utf8("Добрий ранок"));
+
+	TranslationServer *ts = TranslationServer::get_singleton();
+
+	int l_count_before = ts->get_loaded_locales().size();
+	ts->add_translation(t);
+	int l_count_after = ts->get_loaded_locales().size();
+	// Newly created Translation object should be added to the list, so the counter should increase, too.
+	CHECK(l_count_after > l_count_before);
+
+	Ref<Translation> trans = ts->get_translation_object("uk");
+	CHECK(trans.is_valid());
+
+	ts->set_locale("uk");
+	CHECK(ts->translate("Good Morning") == String::utf8("Добрий ранок"));
+
+	ts->remove_translation(t);
+	trans = ts->get_translation_object("uk");
+	CHECK(trans.is_null());
+	// If no suitable Translation object has been found - the original message should be returned.
+	CHECK(ts->translate("Good Morning") == "Good Morning");
+}
+
+TEST_CASE("[TranslationServer] Locale operations") {
+	TranslationServer *ts = TranslationServer::get_singleton();
+
+	// Language variant test; we supplied the variant of Español and the result should be the same string.
+	String loc = "es_Hani_ES_tradnl";
+	String res = ts->standardize_locale(loc);
+
+	CHECK(res == loc);
+
+	// No such variant in variant_map; should return everything except the variant.
+	loc = "es_Hani_ES_missing";
+	res = ts->standardize_locale(loc);
+
+	CHECK(res == "es_Hani_ES");
+
+	// Non-ISO language name check (Windows issue).
+	loc = "iw_Hani_IL";
+	res = ts->standardize_locale(loc);
+
+	CHECK(res == "he_Hani_IL");
+
+	// Country rename check.
+	loc = "uk_Hani_UK";
+	res = ts->standardize_locale(loc);
+
+	CHECK(res == "uk_Hani_GB");
+
+	// Supplying a script name that is not in the list.
+	loc = "de_Wrong_DE";
+	res = ts->standardize_locale(loc);
+
+	CHECK(res == "de_DE");
+}
+
+TEST_CASE("[TranslationServer] Comparing locales") {
+	TranslationServer *ts = TranslationServer::get_singleton();
+
+	String locale_a = "es";
+	String locale_b = "es";
+
+	// Exact match check.
+	int res = ts->compare_locales(locale_a, locale_b);
+
+	CHECK(res == 10);
+
+	locale_a = "sr-Latn-CS";
+	locale_b = "sr-Latn-RS";
+
+	// Two elements from locales match.
+	res = ts->compare_locales(locale_a, locale_b);
+
+	CHECK(res == 2);
+
+	locale_a = "uz-Cyrl-UZ";
+	locale_b = "uz-Latn-UZ";
+
+	// Two elements match, but they are not sequentual.
+	res = ts->compare_locales(locale_a, locale_b);
+
+	CHECK(res == 2);
+
+	locale_a = "es-EC";
+	locale_b = "fr-LU";
+
+	// No match.
+	res = ts->compare_locales(locale_a, locale_b);
+
+	CHECK(res == 0);
+}
+} // namespace TestTranslationServer
+
+#endif // TEST_TRANSLATION_SERVER_H
diff --git a/tests/test_main.cpp b/tests/test_main.cpp
index 2e99e6fdb6a..17a09a297a7 100644
--- a/tests/test_main.cpp
+++ b/tests/test_main.cpp
@@ -71,6 +71,7 @@
 #include "tests/core/string/test_node_path.h"
 #include "tests/core/string/test_string.h"
 #include "tests/core/string/test_translation.h"
+#include "tests/core/string/test_translation_server.h"
 #include "tests/core/templates/test_command_queue.h"
 #include "tests/core/templates/test_hash_map.h"
 #include "tests/core/templates/test_hash_set.h"