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diff --git a/libs/assimp/test/unit/utDefaultIOStream.cpp b/libs/assimp/test/unit/utDefaultIOStream.cpp
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+++ b/libs/assimp/test/unit/utDefaultIOStream.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 <gtest/gtest.h>
+#include "TestIOStream.h"
+#include "UnitTestFileGenerator.h"
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+
+using namespace ::Assimp;
+
+class utDefaultIOStream : public ::testing::Test {
+    // empty
+};
+
+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( utDefaultIOStream, FileSizeTest ) {
+    const auto dataSize = sizeof(data);
+    const auto dataCount = dataSize / sizeof(*data);
+
+    char fpath[] = { TMP_PATH"rndfp.XXXXXX" };
+    auto* fs = MakeTmpFile(fpath);
+    ASSERT_NE(nullptr, fs);
+    {
+        auto written = std::fwrite(data, sizeof(*data), dataCount, fs );
+        EXPECT_NE( 0U, written );
+
+        auto vflush = std::fflush( fs );
+        ASSERT_EQ(vflush, 0);
+
+		std::fclose(fs);
+		fs = std::fopen(fpath, "r");
+
+		ASSERT_NE(nullptr, fs);
+
+        TestDefaultIOStream myStream( fs, fpath);
+        size_t size = myStream.FileSize();
+        EXPECT_EQ( size, dataSize);
+    }
+    remove(fpath);
+}