poi-ooxml/src/test/java/org/apache/poi/xssf/model/TestCalculationChain.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.xssf.model;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.io.IOException;

import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.jupiter.api.Test;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTCalcCell;

public final class TestCalculationChain {

    @Test
    void test46535() throws IOException {
        try (XSSFWorkbook wb = XSSFTestDataSamples.openSampleWorkbook("46535.xlsx")) {

            CalculationChain chain = wb.getCalculationChain();
            //the bean holding the reference to the formula to be deleted
            CTCalcCell c = chain.getCTCalcChain().getCArray(0);
            int cnt = chain.getCTCalcChain().sizeOfCArray();
            assertEquals(10, c.getI());
            assertEquals("E1", c.getR());

            XSSFSheet sheet = wb.getSheet("Test");
            XSSFCell cell = sheet.getRow(0).getCell(4);

            assertEquals(CellType.FORMULA, cell.getCellType());
            cell.setCellFormula(null);

            //the count of items is less by one
            c = chain.getCTCalcChain().getCArray(0);
            int cnt2 = chain.getCTCalcChain().sizeOfCArray();
            assertEquals(cnt - 1, cnt2);
            //the first item in the calculation chain is the former second one
            assertEquals(10, c.getI());
            assertEquals("C1", c.getR());

            assertEquals(CellType.STRING, cell.getCellType());
            cell.setCellValue("ABC");
            assertEquals(CellType.STRING, cell.getCellType());
        }
    }
}