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diff --git a/libs/assimp/test/unit/utStringUtils.cpp b/libs/assimp/test/unit/utStringUtils.cpp
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+++ b/libs/assimp/test/unit/utStringUtils.cpp
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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include <assimp/StringUtils.h>
+
+class utStringUtils : public ::testing::Test {
+    // empty
+};
+
+TEST_F(utStringUtils, to_string_Test ) {
+    std::string res = ai_to_string( 1 );
+    EXPECT_EQ( res, "1" );
+
+    res = ai_to_string( 1.0f );
+    EXPECT_EQ( res, "1" );
+}
+
+TEST_F(utStringUtils, ai_strtofTest ) {
+    float res = ai_strtof( nullptr, nullptr );
+    EXPECT_FLOAT_EQ( res, 0.0f );
+
+    std::string testStr1 = "200.0";
+    res = ai_strtof( testStr1.c_str(), nullptr );
+    EXPECT_FLOAT_EQ( res, 200.0f );
+
+    std::string testStr2 = "200.0 xxx";
+    const char *begin( testStr2.c_str() );
+    const char *end( begin + 6 );
+    res = ai_strtof( begin, end );
+    EXPECT_FLOAT_EQ( res, 200.0f );
+}
+
+TEST_F(utStringUtils, ai_rgba2hexTest) {
+    std::string result;
+    result = ai_rgba2hex(255, 255, 255, 255, true);
+    EXPECT_EQ(result, "#ffffffff");
+    result = ai_rgba2hex(0, 0, 0, 0, false);
+    EXPECT_EQ(result, "00000000");
+}