src/testcases/org/apache/poi/hssf/usermodel/TestExternalReferenceChange.java

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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.poi.hssf.usermodel;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.io.IOException;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.ss.usermodel.CellType;
import org.junit.jupiter.api.Test;

class TestExternalReferenceChange {

	private static final String MAIN_WORKBOOK_FILENAME = "52575_main.xls";
	private static final String SOURCE_DUMMY_WORKBOOK_FILENAME = "source_dummy.xls";
	private static final String SOURCE_WORKBOOK_FILENAME = "52575_source.xls";

	@Test
	void testDummyToSource() throws IOException {
		try (HSSFWorkbook mainWorkbook = HSSFTestDataSamples.openSampleWorkbook(MAIN_WORKBOOK_FILENAME);
			 HSSFWorkbook sourceWorkbook = HSSFTestDataSamples.openSampleWorkbook(SOURCE_WORKBOOK_FILENAME)) {

			assertNotNull(mainWorkbook);
			assertNotNull(sourceWorkbook);

			boolean changed = mainWorkbook.changeExternalReference("DOESNOTEXIST", SOURCE_WORKBOOK_FILENAME);
			assertFalse(changed);

			changed = mainWorkbook.changeExternalReference(SOURCE_DUMMY_WORKBOOK_FILENAME, SOURCE_WORKBOOK_FILENAME);
			assertTrue(changed);

			HSSFSheet lSheet = mainWorkbook.getSheetAt(0);
			HSSFCell lA1Cell = lSheet.getRow(0).getCell(0);

			assertEquals(CellType.FORMULA, lA1Cell.getCellType());

			HSSFFormulaEvaluator lMainWorkbookEvaluator = new HSSFFormulaEvaluator(mainWorkbook);
			HSSFFormulaEvaluator lSourceEvaluator = new HSSFFormulaEvaluator(sourceWorkbook);
			HSSFFormulaEvaluator.setupEnvironment(
					new String[]{MAIN_WORKBOOK_FILENAME, SOURCE_WORKBOOK_FILENAME},
					new HSSFFormulaEvaluator[]{lMainWorkbookEvaluator, lSourceEvaluator});

			assertEquals(CellType.NUMERIC, lMainWorkbookEvaluator.evaluateFormulaCell(lA1Cell));

			assertEquals(20.0d, lA1Cell.getNumericCellValue(), 0.00001d);
		}
	}

}