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diff --git a/libs/assimp/test/unit/utVertexTriangleAdjacency.cpp b/libs/assimp/test/unit/utVertexTriangleAdjacency.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/mesh.h>
+#include <assimp/types.h>
+
+#include "Common/VertexTriangleAdjacency.h"
+
+using namespace std;
+using namespace Assimp;
+
+class VTAdjacencyTest : public ::testing::Test {
+protected:
+    void checkMesh(const aiMesh &mesh);
+};
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(VTAdjacencyTest, largeRandomDataSet) {
+    // build a test mesh with randomized input data
+    // *******************************************************************************
+    aiMesh mesh;
+
+    mesh.mNumVertices = 500;
+    mesh.mNumFaces = 600;
+
+    mesh.mFaces = new aiFace[600];
+    unsigned int iCurrent = 0;
+    for (unsigned int i = 0; i < 600; ++i) {
+        aiFace &face = mesh.mFaces[i];
+        face.mNumIndices = 3;
+        face.mIndices = new unsigned int[3];
+
+        if (499 == iCurrent) iCurrent = 0;
+        face.mIndices[0] = iCurrent++;
+
+        while (face.mIndices[0] == (face.mIndices[1] = (unsigned int)(((float)rand() / RAND_MAX) * 499)))
+            ;
+        while (face.mIndices[0] == (face.mIndices[2] = (unsigned int)(((float)rand() / RAND_MAX) * 499)) ||
+                face.mIndices[1] == face.mIndices[2])
+            ;
+    }
+
+    checkMesh(mesh);
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(VTAdjacencyTest, smallDataSet) {
+
+    // build a test mesh - this one is extremely small
+    // *******************************************************************************
+    aiMesh mesh;
+
+    mesh.mNumVertices = 5;
+    mesh.mNumFaces = 3;
+
+    mesh.mFaces = new aiFace[3];
+    mesh.mFaces[0].mIndices = new unsigned int[3];
+    mesh.mFaces[0].mNumIndices = 3;
+    mesh.mFaces[1].mIndices = new unsigned int[3];
+    mesh.mFaces[1].mNumIndices = 3;
+    mesh.mFaces[2].mIndices = new unsigned int[3];
+    mesh.mFaces[2].mNumIndices = 3;
+
+    mesh.mFaces[0].mIndices[0] = 1;
+    mesh.mFaces[0].mIndices[1] = 3;
+    mesh.mFaces[0].mIndices[2] = 2;
+
+    mesh.mFaces[1].mIndices[0] = 0;
+    mesh.mFaces[1].mIndices[1] = 2;
+    mesh.mFaces[1].mIndices[2] = 3;
+
+    mesh.mFaces[2].mIndices[0] = 3;
+    mesh.mFaces[2].mIndices[1] = 0;
+    mesh.mFaces[2].mIndices[2] = 4;
+
+    checkMesh(mesh);
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(VTAdjacencyTest, unreferencedVerticesSet) {
+    // build a test mesh which does not reference all vertices
+    // *******************************************************************************
+    aiMesh mesh;
+
+    mesh.mNumVertices = 500;
+    mesh.mNumFaces = 600;
+
+    mesh.mFaces = new aiFace[600];
+    unsigned int iCurrent = 0;
+    for (unsigned int i = 0; i < 600; ++i) {
+        aiFace &face = mesh.mFaces[i];
+        face.mNumIndices = 3;
+        face.mIndices = new unsigned int[3];
+
+        if (499 == iCurrent) iCurrent = 0;
+        face.mIndices[0] = iCurrent++;
+
+        if (499 == iCurrent) iCurrent = 0;
+        face.mIndices[1] = iCurrent++;
+
+        if (499 == iCurrent) iCurrent = 0;
+        face.mIndices[2] = iCurrent++;
+
+        if (rand() > RAND_MAX / 2 && face.mIndices[0]) {
+            face.mIndices[0]--;
+        } else if (face.mIndices[1])
+            face.mIndices[1]--;
+    }
+
+    checkMesh(mesh);
+}
+
+// ------------------------------------------------------------------------------------------------
+void VTAdjacencyTest::checkMesh(const aiMesh &mesh) {
+    VertexTriangleAdjacency adj(mesh.mFaces, mesh.mNumFaces, mesh.mNumVertices, true);
+
+    unsigned int *const piNum = adj.mLiveTriangles;
+
+    // check the primary adjacency table and check whether all faces
+    // are contained in the list
+    unsigned int maxOfs = 0;
+    for (unsigned int i = 0; i < mesh.mNumFaces; ++i) {
+        aiFace &face = mesh.mFaces[i];
+        for (unsigned int qq = 0; qq < 3; ++qq) {
+            const unsigned int idx = face.mIndices[qq];
+            const unsigned int num = piNum[idx];
+
+            // go to this offset
+            const unsigned int ofs = adj.mOffsetTable[idx];
+            maxOfs = std::max(ofs + num, maxOfs);
+            unsigned int *pi = &adj.mAdjacencyTable[ofs];
+
+            // and search for us ...
+            unsigned int tt = 0;
+            for (; tt < num; ++tt, ++pi) {
+                if (i == *pi) {
+                    // mask our entry in the table. Finally all entries should be masked
+                    *pi = 0xffffffff;
+
+                    // there shouldn't be two entries for the same face
+                    break;
+                }
+            }
+            // assert if *this* vertex has not been found in the table
+            EXPECT_LT(tt, num);
+        }
+    }
+
+    // now check whether there are invalid faces
+    const unsigned int *pi = adj.mAdjacencyTable;
+    for (unsigned int i = 0; i < maxOfs; ++i, ++pi) {
+        EXPECT_EQ(0xffffffff, *pi);
+    }
+
+    // check the numTrianglesPerVertex table
+    for (unsigned int i = 0; i < mesh.mNumFaces; ++i) {
+        aiFace &face = mesh.mFaces[i];
+        for (unsigned int qq = 0; qq < 3; ++qq) {
+            const unsigned int idx = face.mIndices[qq];
+
+            // we should not reach 0 here ...
+            EXPECT_NE(0U, piNum[idx]);
+            piNum[idx]--;
+        }
+    }
+
+    // check whether we reached 0 in all entries
+    for (unsigned int i = 0; i < mesh.mNumVertices; ++i) {
+        EXPECT_FALSE(piNum[i]);
+    }
+}