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diff --git a/libs/assimp/test/unit/utIOStreamBuffer.cpp b/libs/assimp/test/unit/utIOStreamBuffer.cpp
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+++ b/libs/assimp/test/unit/utIOStreamBuffer.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/IOStreamBuffer.h>
+#include "TestIOStream.h"
+#include "UnitTestFileGenerator.h"
+
+class IOStreamBufferTest : public ::testing::Test {
+    // empty
+};
+
+using namespace Assimp;
+
+TEST_F( IOStreamBufferTest, creationTest ) {
+    bool ok( true );
+    try {
+        IOStreamBuffer<char> myBuffer;
+    } catch ( ... ) {
+        ok = false;
+    }
+    EXPECT_TRUE( ok );
+}
+
+TEST_F( IOStreamBufferTest, accessCacheSizeTest ) {
+    IOStreamBuffer<char> myBuffer1;
+    EXPECT_NE( 0U, myBuffer1.cacheSize() );
+
+    IOStreamBuffer<char> myBuffer2( 100 );
+    EXPECT_EQ( 100U, myBuffer2.cacheSize() );
+}
+
+const char data[]{"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Qui\
+sque luctus sem diam, ut eleifend arcu auctor eu. Vestibulum id est vel nulla l\
+obortis malesuada ut sed turpis. Nulla a volutpat tortor. Nunc vestibulum portt\
+itor sapien ornare sagittis volutpat."};
+
+
+TEST_F( IOStreamBufferTest, open_close_Test ) {
+    IOStreamBuffer<char> myBuffer;
+
+    EXPECT_FALSE( myBuffer.open( nullptr ) );
+    EXPECT_FALSE( myBuffer.close() );
+
+    const auto dataSize = sizeof(data);
+    const auto dataCount = dataSize / sizeof(*data);
+
+    char fname[]={ "octest.XXXXXX" };
+    auto* fs = MakeTmpFile(fname);
+    ASSERT_NE(nullptr, fs);
+
+    auto written = std::fwrite( data, sizeof(*data), dataCount, fs );
+    EXPECT_NE( 0U, written );
+    auto flushResult = std::fflush( fs );
+	ASSERT_EQ(0, flushResult);
+	std::fclose( fs );
+	fs = std::fopen(fname, "r");
+	ASSERT_NE(nullptr, fs);
+    {
+        TestDefaultIOStream myStream( fs, fname );
+
+        EXPECT_TRUE( myBuffer.open( &myStream ) );
+        EXPECT_FALSE( myBuffer.open( &myStream ) );
+        EXPECT_TRUE( myBuffer.close() );
+    }
+    remove(fname);
+}
+
+TEST_F( IOStreamBufferTest, readlineTest ) {
+
+    const auto dataSize = sizeof(data);
+    const auto dataCount = dataSize / sizeof(*data);
+
+    char fname[]={ "readlinetest.XXXXXX" };
+    auto* fs = MakeTmpFile(fname);
+    ASSERT_NE(nullptr, fs);
+
+    auto written = std::fwrite( data, sizeof(*data), dataCount, fs );
+    EXPECT_NE( 0U, written );
+
+	auto flushResult = std::fflush(fs);
+	ASSERT_EQ(0, flushResult);
+	std::fclose(fs);
+	fs = std::fopen(fname, "r");
+	ASSERT_NE(nullptr, fs);
+
+    const auto tCacheSize = 26u;
+
+    IOStreamBuffer<char> myBuffer( tCacheSize );
+    EXPECT_EQ(tCacheSize, myBuffer.cacheSize() );
+
+    TestDefaultIOStream myStream( fs, fname );
+    auto size = myStream.FileSize();
+    auto numBlocks = size / myBuffer.cacheSize();
+    if ( size % myBuffer.cacheSize() > 0 ) {
+        numBlocks++;
+    }
+    EXPECT_TRUE( myBuffer.open( &myStream ) );
+    EXPECT_EQ( numBlocks, myBuffer.getNumBlocks() );
+    EXPECT_TRUE( myBuffer.close() );
+}
+
+TEST_F( IOStreamBufferTest, accessBlockIndexTest ) {
+
+}
+