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diff --git a/src/mesh/assimp-master/test/unit/utMatrix4x4.cpp b/src/mesh/assimp-master/test/unit/utMatrix4x4.cpp
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+++ b/src/mesh/assimp-master/test/unit/utMatrix4x4.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"
+
+using namespace Assimp;
+
+class utMatrix4x4 : public ::testing::Test {
+};
+
+TEST_F(utMatrix4x4, badIndexOperatorTest) {
+    aiMatrix4x4 m;
+    ai_real *a0 = m[4];
+    EXPECT_EQ(NULL, a0);
+}
+
+TEST_F(utMatrix4x4, indexOperatorTest) {
+    aiMatrix4x4 m;
+    ai_real *a0 = m[0];
+    EXPECT_FLOAT_EQ(1.0, *a0);
+    ai_real *a1 = a0 + 1;
+    EXPECT_FLOAT_EQ(0.0, *a1);
+    ai_real *a2 = a0 + 2;
+    EXPECT_FLOAT_EQ(0.0, *a2);
+    ai_real *a3 = a0 + 3;
+    EXPECT_FLOAT_EQ(0.0, *a3);
+
+    ai_real *a4 = m[1];
+    EXPECT_FLOAT_EQ(0.0, *a4);
+    ai_real *a5 = a4 + 1;
+    EXPECT_FLOAT_EQ(1.0, *a5);
+    ai_real *a6 = a4 + 2;
+    EXPECT_FLOAT_EQ(0.0, *a6);
+    ai_real *a7 = a4 + 3;
+    EXPECT_FLOAT_EQ(0.0, *a7);
+
+    ai_real *a8 = m[2];
+    EXPECT_FLOAT_EQ(0.0, *a8);
+    ai_real *a9 = a8 + 1;
+    EXPECT_FLOAT_EQ(0.0, *a9);
+    ai_real *a10 = a8 + 2;
+    EXPECT_FLOAT_EQ(1.0, *a10);
+    ai_real *a11 = a8 + 3;
+    EXPECT_FLOAT_EQ(0.0, *a11);
+
+    ai_real *a12 = m[3];
+    EXPECT_FLOAT_EQ(0.0, *a12);
+    ai_real *a13 = a12 + 1;
+    EXPECT_FLOAT_EQ(0.0, *a13);
+    ai_real *a14 = a12 + 2;
+    EXPECT_FLOAT_EQ(0.0, *a14);
+    ai_real *a15 = a12 + 3;
+    EXPECT_FLOAT_EQ(1.0, *a15);
+}