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diff --git a/src/ooxml/testcases/org/apache/poi/xssf/DeferredSXSSFITestDataProvider.java b/src/ooxml/testcases/org/apache/poi/xssf/DeferredSXSSFITestDataProvider.java
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+++ b/src/ooxml/testcases/org/apache/poi/xssf/DeferredSXSSFITestDataProvider.java
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+/*
+ *  ====================================================================
+ *    Licensed to the Apache Software Foundation (ASF) under one or more
+ *    contributor license agreements.  See the NOTICE file distributed with
+ *    this work for additional information regarding copyright ownership.
+ *    The ASF licenses this file to You under the Apache License, Version 2.0
+ *    (the "License"); you may not use this file except in compliance with
+ *    the License.  You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ * ====================================================================
+ */
+
+package org.apache.poi.xssf;
+
+import org.apache.poi.POIDataSamples;
+import org.apache.poi.ss.ITestDataProvider;
+import org.apache.poi.ss.SpreadsheetVersion;
+import org.apache.poi.ss.usermodel.FormulaEvaluator;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+import org.apache.poi.xssf.streaming.DeferredSXSSFSheet;
+import org.apache.poi.xssf.streaming.DeferredSXSSFWorkbook;
+import org.apache.poi.xssf.streaming.SXSSFWorkbook;
+import org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Collection;
+
+public final class DeferredSXSSFITestDataProvider implements ITestDataProvider {
+    public static final DeferredSXSSFITestDataProvider instance = new DeferredSXSSFITestDataProvider();
+
+    // an instance of all DeferredSXSSFWorkbooks opened by this TestDataProvider,
+    // so that the temporary files created can be disposed up by cleanup()
+    private final Collection<DeferredSXSSFWorkbook> instances = new ArrayList<>();
+
+    private DeferredSXSSFITestDataProvider() {
+        // enforce singleton
+    }
+
+    @Override
+    public Workbook openSampleWorkbook(String sampleFileName) {
+        XSSFWorkbook xssfWorkbook = XSSFITestDataProvider.instance.openSampleWorkbook(sampleFileName);
+        DeferredSXSSFWorkbook swb = new DeferredSXSSFWorkbook(xssfWorkbook);
+        instances.add(swb);
+        return swb;
+    }
+
+    /**
+     * Returns an XSSFWorkbook since SXSSFWorkbook is write-only
+     */
+    @Override
+    public XSSFWorkbook writeOutAndReadBack(Workbook wb) {
+        // wb is usually an SXSSFWorkbook, but must also work on an XSSFWorkbook
+        // since workbooks must be able to be written out and read back
+        // several times in succession
+        if(!(wb instanceof SXSSFWorkbook || wb instanceof XSSFWorkbook)) {
+            throw new IllegalArgumentException("Expected an instance of XSSFWorkbook");
+        }
+
+        XSSFWorkbook result;
+        try {
+            ByteArrayOutputStream baos = new ByteArrayOutputStream(8192);
+            wb.write(baos);
+            InputStream is = new ByteArrayInputStream(baos.toByteArray());
+            result = new XSSFWorkbook(is);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        return result;
+    }
+
+    @Override
+    public DeferredSXSSFWorkbook createWorkbook() {
+        DeferredSXSSFWorkbook wb = new DeferredSXSSFWorkbook();
+        instances.add(wb);
+        return wb;
+    }
+    
+    //************ SXSSF-specific methods ***************//
+    @Override
+    public DeferredSXSSFWorkbook createWorkbook(int rowAccessWindowSize) {
+        DeferredSXSSFWorkbook wb = new DeferredSXSSFWorkbook(rowAccessWindowSize);
+        instances.add(wb);
+        return wb;
+    }
+    
+    @Override
+    public void trackAllColumnsForAutosizing(Sheet sheet) {
+        ((DeferredSXSSFSheet)sheet).trackAllColumnsForAutoSizing();
+    }
+    //************ End SXSSF-specific methods ***************//
+    
+    @Override
+    public FormulaEvaluator createFormulaEvaluator(Workbook wb) {
+        return new XSSFFormulaEvaluator(((DeferredSXSSFWorkbook) wb).getXSSFWorkbook());
+    }
+
+    @Override
+    public byte[] getTestDataFileContent(String fileName) {
+        return POIDataSamples.getSpreadSheetInstance().readFile(fileName);
+    }
+
+    @Override
+    public SpreadsheetVersion getSpreadsheetVersion() {
+        return SpreadsheetVersion.EXCEL2007;
+    }
+
+    @Override
+    public String getStandardFileNameExtension() {
+        return "xlsx";
+    }
+
+    public synchronized boolean cleanup() {
+        boolean ok = true;
+        for(final DeferredSXSSFWorkbook wb : instances) {
+            ok = ok && wb.dispose();
+        }
+        instances.clear();
+        return ok;
+    }
+}