Add automated test for strings formatting and localization

Source/Engine/Tests/TestLocalization.cpp

@@ -0,0 +1,54 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+#include "Engine/Core/Formatting.h"
+#include "Engine/Core/Types/String.h"
+#include "Engine/Core/Math/Vector2.h"
+#include "Engine/Core/Math/Vector3.h"
+#include "Engine/Localization/Localization.h"
+#include <ThirdParty/catch2/catch.hpp>
+
+struct MyStruct
+{
+    Vector2 Direction;
+    float Speed;
+};
+
+DEFINE_DEFAULT_FORMATTING(MyStruct, "Direction:{0} Speed:{1}", v.Direction, v.Speed);
+
+TEST_CASE("Localization")
+{
+    SECTION("Test Fallback Values")
+    {
+        String myStr = Localization::GetString(TEXT("localized_id"), TEXT("Fallback value"));
+        String myStrPlural = Localization::GetPluralString(TEXT("localized_id_n"), 2, TEXT("Count: {}"));
+        CHECK(myStr == TEXT("Fallback value"));
+        CHECK(myStrPlural == TEXT("Count: 2"));
+    }
+    SECTION("Test String Formatting")
+    {
+        // https://docs.flaxengine.com/manual/scripting/cpp/string-formatting.html
+
+        // Values formatting
+        auto str1 = String::Format(TEXT("a: {0}, b: {1}, a: {0}"), TEXT("a"), TEXT("b"));
+        CHECK(str1 == TEXT("a: a, b: b, a: a"));
+        auto str2 = String::Format(TEXT("1: {}, 2: {}, 3: {}"), 1, 2, 3);
+        CHECK(str2 == TEXT("1: 1, 2: 2, 3: 3"));
+        auto str3 = String::Format(TEXT("vector: {0}"), Vector3(1, 2, 3));
+        CHECK(str3 == TEXT("vector: X:1.0 Y:2.0 Z:3.0"));
+        String str = TEXT("hello");
+        auto str4 = String::Format(TEXT("string: {0}"), str.ToString());
+        CHECK(str4 == TEXT("string: hello"));
+        auto str5 = String::Format(TEXT("boolean: {0}"), true);
+        CHECK(str5 == TEXT("boolean: true"));
+
+        // Custom type formatting
+        MyStruct data = { Vector2(1, 2), 10.0f };
+        auto str6 = String::Format(TEXT("{0}"), data);
+        CHECK(str6 == TEXT("Direction:X:1.0 Y:2.0 Speed:10.0"));
+
+        // Named arguments formatting
+        String text1 = String::Format(TEXT("text: {0}, {1}"), TEXT("one"), TEXT("two"));
+        String text2 = String::Format(TEXT("text: {arg0}, {arg1}"), fmt::arg(TEXT("arg0"), TEXT("one")), fmt::arg(TEXT("arg1"), TEXT("two")));
+        CHECK(text1 == text2);
+    }
+}