change files location

apache-poi/src/test/java/com/baeldung/poi/excel/setFormula/ExcelFormulaUnitTest.java

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+package com.baeldung.poi.excel.setFormula;
+
+import org.apache.poi.ss.util.CellReference;
+import org.apache.poi.xssf.usermodel.XSSFSheet;
+import org.junit.Assert;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+class ExcelFormulaUnitTest {
+    @Test
+    void givenExcelData_whenSetAndEvaluateFormula() throws IOException {
+        ExcelFormula excelFormula = new ExcelFormula();
+        List<Integer> data = Arrays.asList(2, 5, 10, 15, 7, 9);
+        XSSFSheet sheet = excelFormula.inserData(data);
+        int result = 0;
+        for (int row = 0; row <= sheet.getLastRowNum(); row++) {
+            result += sheet.getRow(row).getCell(0).getNumericCellValue();
+        }
+        String colName = CellReference.convertNumToColString(0);
+        String startCell = colName + 1;
+        String stopCell = colName + (sheet.getLastRowNum() + 1);
+        String sumFormula = String.format("SUM(%s:%s)", startCell, stopCell);
+        int resultValue = (int) excelFormula.setFormula(sumFormula);
+        Assert.assertEquals("The results are the same!", resultValue , result);
+    }
+}