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diff --git a/libs/assimp/test/unit/utIOSystem.cpp b/libs/assimp/test/unit/utIOSystem.cpp
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+++ b/libs/assimp/test/unit/utIOSystem.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 "TestIOSystem.h"
+
+#include <assimp/IOSystem.hpp>
+
+using namespace std;
+using namespace Assimp;
+
+class IOSystemTest : public ::testing::Test {
+public:
+    virtual void SetUp() {
+        pImp = new TestIOSystem();
+    }
+
+    virtual void TearDown() {
+        delete pImp;
+    }
+
+protected:
+    TestIOSystem* pImp;
+};
+
+TEST_F( IOSystemTest, accessDirectoryStackTest ) {
+    EXPECT_FALSE( pImp->PopDirectory() );
+    EXPECT_EQ( 0U, pImp->StackSize() );
+    EXPECT_FALSE( pImp->PushDirectory( "" ) );
+    std::string path = "test/";
+    EXPECT_TRUE( pImp->PushDirectory( path ) );
+    EXPECT_EQ( 1U, pImp->StackSize() );
+    EXPECT_EQ( path, pImp->CurrentDirectory() );
+    EXPECT_TRUE( pImp->PopDirectory() );
+    EXPECT_EQ( 0U, pImp->StackSize() );
+}
+
+TEST_F( IOSystemTest, delFileTest ) {
+    EXPECT_FALSE( pImp->DeleteFile( "none" ) );
+}