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diff --git a/libs/assimp/test/unit/AssimpAPITest_aiQuaternion.cpp b/libs/assimp/test/unit/AssimpAPITest_aiQuaternion.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 "MathTest.h"
+
+using namespace Assimp;
+
+class AssimpAPITest_aiQuaternion : public AssimpMathTest {
+protected:
+    virtual void SetUp() {
+        result_c = result_cpp = aiQuaternion();
+    }
+
+    aiQuaternion result_c, result_cpp;
+};
+
+TEST_F(AssimpAPITest_aiQuaternion, aiCreateQuaternionFromMatrixTest) {
+    // Use a predetermined transformation matrix
+    // to prevent running into division by zero.
+    aiMatrix3x3 m, r;
+    aiMatrix3x3::Translation(aiVector2D(14,-25), m);
+    aiMatrix3x3::RotationZ(Math::aiPi<float>() / 4.0f, r);
+    m = m * r;
+
+    result_cpp = aiQuaternion(m);
+    aiCreateQuaternionFromMatrix(&result_c, &m);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionFromEulerAnglesTest) {
+    const float x(RandPI.next()),
+        y(RandPI.next()),
+        z(RandPI.next());
+    result_cpp = aiQuaternion(x, y, z);
+    aiQuaternionFromEulerAngles(&result_c, x, y, z);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionFromAxisAngleTest) {
+    const float angle(RandPI.next());
+    const aiVector3D axis(random_unit_vec3());
+    result_cpp = aiQuaternion(axis, angle);
+    aiQuaternionFromAxisAngle(&result_c, &axis, angle);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionFromNormalizedQuaternionTest) {
+    const auto qvec3 = random_unit_vec3();
+    result_cpp = aiQuaternion(qvec3);
+    aiQuaternionFromNormalizedQuaternion(&result_c, &qvec3);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionAreEqualTest) {
+    result_c = result_cpp = random_quat();
+    EXPECT_EQ(result_cpp == result_c,
+        (bool)aiQuaternionAreEqual(&result_cpp, &result_c));
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionAreEqualEpsilonTest) {
+    result_c = result_cpp = random_quat();
+    EXPECT_EQ(result_cpp.Equal(result_c, Epsilon),
+        (bool)aiQuaternionAreEqualEpsilon(&result_cpp, &result_c, Epsilon));
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionNormalizeTest) {
+    result_c = result_cpp = random_quat();
+    aiQuaternionNormalize(&result_c);
+    EXPECT_EQ(result_cpp.Normalize(), result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionConjugateTest) {
+    result_c = result_cpp = random_quat();
+    aiQuaternionConjugate(&result_c);
+    EXPECT_EQ(result_cpp.Conjugate(), result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionMultiplyTest) {
+    const aiQuaternion temp = random_quat();
+    result_c = result_cpp = random_quat();
+    result_cpp = result_cpp * temp;
+    aiQuaternionMultiply(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionInterpolateTest) {
+    // Use predetermined quaternions to prevent division by zero
+    // during slerp calculations.
+    const float INTERPOLATION(0.5f);
+    const auto q1 = aiQuaternion(aiVector3D(-1,1,1).Normalize(), Math::aiPi<float>() / 4.0f);
+    const auto q2 = aiQuaternion(aiVector3D(1,2,1).Normalize(), Math::aiPi<float>() / 2.0f);
+    aiQuaternion::Interpolate(result_cpp, q1, q2, INTERPOLATION);
+    aiQuaternionInterpolate(&result_c, &q1, &q2, INTERPOLATION);
+    EXPECT_EQ(result_cpp, result_c);
+}