add unit test

apache-poi/src/test/java/com/baeldung/poi/excel/insert/ExcelInsertRowUnitTest.java

@@ -0,0 +1,41 @@
+package com.baeldung.poi.excel.insert;
+
+import org.apache.poi.ss.usermodel.Workbook;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.jupiter.api.Assertions;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.nio.file.Paths;
+
+public class ExcelInsertRowUnitTest {
+    private static final String FILE_NAME = "test.xlsx";
+    private static final String NEW_FILE_NAME = "new_test.xlsx";
+    private String fileLocation;
+    private InsertRowHelper insertRowHelper;
+
+    @Before
+    public void setup() throws URISyntaxException {
+        fileLocation = Paths.get(ClassLoader.getSystemResource(FILE_NAME).toURI()).toString();
+        insertRowHelper = new InsertRowHelper();
+    }
+
+    @Test
+    public void givenWorkbook_whenInsertRowBetween_thenRowCreated() throws IOException {
+        Workbook newWorkbook = insertRowHelper.insertRowBetweenRows(fileLocation, 2, 1);
+        FileOutputStream outputStream = new FileOutputStream(NEW_FILE_NAME);
+        newWorkbook.write(outputStream);
+        File file = new File(NEW_FILE_NAME);
+
+        final int expectedRowResult = 5;
+        Assertions.assertEquals(expectedRowResult, newWorkbook.getSheetAt(0).getLastRowNum());
+
+        outputStream.close();
+        file.delete();
+        newWorkbook.close();
+    }
+
+}