fix: Correct off-by-one error in CsvRow#getCell(int)

fesod/src/main/java/org/apache/fesod/sheet/metadata/csv/CsvRow.java

@@ -105,10 +105,10 @@ public int getRowNum() {
 
     @Override
     public Cell getCell(int cellnum) {
-        if (cellnum >= cellList.size()) {
+        if (cellnum < 0 || cellnum >= cellList.size()) {
             return null;
         }
-        return cellList.get(cellnum - 1);
+        return cellList.get(cellnum);
     }
 
     @Override

fesod/src/test/java/org/apache/fesod/sheet/csv/AssertCsvHeadDataWriteHandler.java

@@ -0,0 +1,61 @@
+/*
+ * 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.fesod.sheet.csv;
+
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.apache.fesod.sheet.write.handler.WorkbookWriteHandler;
+import org.apache.fesod.sheet.write.handler.context.WorkbookWriteHandlerContext;
+import org.apache.fesod.sheet.write.metadata.holder.WriteWorkbookHolder;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.Row;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.junit.jupiter.api.Assertions;
+
+@RequiredArgsConstructor
+public class AssertCsvHeadDataWriteHandler implements WorkbookWriteHandler {
+
+    private final List<List<String>> head;
+    private final List<List<String>> data;
+
+    @Override
+    public void afterWorkbookDispose(WorkbookWriteHandlerContext context) {
+        WriteWorkbookHolder workbook = context.getWriteWorkbookHolder();
+
+        Sheet sheet = workbook.getWorkbook().getSheetAt(0);
+
+        Row headRow = sheet.getRow(0);
+        for (int i = 0; i < head.size(); i++) {
+            Cell cell = headRow.getCell(i);
+
+            Assertions.assertEquals(head.get(i).get(0), cell.getStringCellValue());
+        }
+
+        for (int i = 0; i < data.size(); i++) {
+            Row dataRow = sheet.getRow(i + 1);
+
+            for (int j = 0; j < data.get(i).size(); j++) {
+                Cell cell = dataRow.getCell(j);
+
+                Assertions.assertEquals(data.get(i).get(j), cell.getStringCellValue());
+            }
+        }
+    }
+}

fesod/src/test/java/org/apache/fesod/sheet/csv/CsvRowTest.java

@@ -0,0 +1,140 @@
+/*
+ * 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.fesod.sheet.csv;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import org.apache.fesod.sheet.FastExcel;
+import org.apache.fesod.sheet.metadata.csv.CsvRow;
+import org.apache.fesod.sheet.metadata.csv.CsvSheet;
+import org.apache.fesod.sheet.metadata.csv.CsvWorkbook;
+import org.apache.fesod.sheet.util.TestFileUtil;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.CellType;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+public class CsvRowTest {
+
+    @Mock
+    private CsvWorkbook csvWorkbook;
+
+    @Mock
+    private CsvSheet csvSheet;
+
+    private CsvRow csvRow;
+
+    private static File fileCsvNoModel;
+    private static File fileCsvModel;
+
+    @BeforeEach
+    void setUp() {
+        csvRow = new CsvRow(csvWorkbook, csvSheet, 1);
+
+        Cell firstCell = csvRow.createCell(0, CellType.STRING);
+        firstCell.setCellValue("No");
+        Cell middleCell = csvRow.createCell(1, CellType.STRING);
+        middleCell.setCellValue("Name");
+        Cell lastCell = csvRow.createCell(2, CellType.STRING);
+        lastCell.setCellValue("Age");
+
+        fileCsvNoModel = TestFileUtil.createNewFile("csv-no-model.csv");
+        fileCsvModel = TestFileUtil.createNewFile("csv-model.csv");
+    }
+
+    @Test
+    void testGetCellWithFirstIndexShouldReturnFirstCell() {
+        Cell actualCell = csvRow.getCell(0);
+        Assertions.assertNotNull(actualCell);
+        Assertions.assertEquals("No", actualCell.getStringCellValue());
+    }
+
+    @Test
+    void testGetCellWithMiddleIndexShouldReturnMiddleCell() {
+        Cell actualCell = csvRow.getCell(1);
+        Assertions.assertNotNull(actualCell);
+        Assertions.assertEquals("Name", actualCell.getStringCellValue());
+    }
+
+    @Test
+    void testGetCellWithLastIndexShouldReturnLastCell() {
+        Cell actualCell = csvRow.getCell(2);
+        Assertions.assertNotNull(actualCell);
+        Assertions.assertEquals("Age", actualCell.getStringCellValue());
+    }
+
+    @Test
+    void testGetCellWithOutOfBoundsIndexShouldReturnNull() {
+        Cell actualCell1 = csvRow.getCell(3);
+        Assertions.assertNull(actualCell1);
+
+        Cell actualCell2 = csvRow.getCell(-1);
+        Assertions.assertNull(actualCell2);
+    }
+
+    @Test
+    void testCsvWriteWithOutModelShouldSuccess() {
+        FastExcel.write(fileCsvNoModel)
+                .head(head())
+                .registerWriteHandler(new AssertCsvHeadDataWriteHandler(head(), data()))
+                .csv()
+                .doWrite(data());
+    }
+
+    @Test
+    void testCsvWriteWithModelShouldSuccess() {
+        FastExcel.write(fileCsvModel)
+                .head(SimpleCsvData.class)
+                .registerWriteHandler(new AssertCsvHeadDataWriteHandler(head(), data()))
+                .csv()
+                .doWrite(modelData());
+    }
+
+    private static List<SimpleCsvData> modelData() {
+        List<SimpleCsvData> data = new ArrayList<>();
+        data.add(new SimpleCsvData("1", "Jackson", "20"));
+        data.add(new SimpleCsvData("2", "Tom", "21"));
+        data.add(new SimpleCsvData("3", "Sophia", "20"));
+        return data;
+    }
+
+    private static List<List<String>> data() {
+        List<List<String>> data = new ArrayList<>();
+        data.add(Arrays.asList("1", "Jackson", "20"));
+        data.add(Arrays.asList("2", "Tom", "21"));
+        data.add(Arrays.asList("3", "Sophia", "20"));
+        return data;
+    }
+
+    private List<List<String>> head() {
+        List<List<String>> head = new ArrayList<>();
+        head.add(Arrays.asList("No"));
+        head.add(Arrays.asList("Name"));
+        head.add(Arrays.asList("Age"));
+        return head;
+    }
+}

fesod/src/test/java/org/apache/fesod/sheet/csv/SimpleCsvData.java

@@ -0,0 +1,44 @@
+/*
+ * 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.fesod.sheet.csv;
+
+import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import org.apache.fesod.sheet.annotation.ExcelProperty;
+
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@EqualsAndHashCode
+public class SimpleCsvData {
+
+    @ExcelProperty("No")
+    private String no;
+
+    @ExcelProperty("Name")
+    private String name;
+
+    @ExcelProperty("Age")
+    private String age;
+}