Unit tests for merge ranges for Ods Reader/Writer

tests/PhpSpreadsheetTests/Reader/Ods/MergeRangeTest.php

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+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Ods;
+
+use PhpOffice\PhpSpreadsheet\Reader\Ods;
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PHPUnit\Framework\TestCase;
+
+class MergeRangeTest extends TestCase
+{
+    /**
+     * @var Spreadsheet
+     */
+    private $spreadsheet;
+
+    protected function setUp(): void
+    {
+        $filename = 'tests/data/Reader/Ods/MergeRangeTest.ods';
+        $reader = new Ods();
+        $this->spreadsheet = $reader->load($filename);
+    }
+
+    public function testAutoFilterRange(): void
+    {
+        $worksheet = $this->spreadsheet->getActiveSheet();
+
+        $mergeRanges = $worksheet->getMergeCells();
+        self::assertArrayHasKey('B2:C3', $mergeRanges);
+    }
+}

tests/PhpSpreadsheetTests/Writer/Ods/MergeRangeTest.php

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+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Ods;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheetTests\Functional\AbstractFunctional;
+
+class MergeRangeTest extends AbstractFunctional
+{
+    public function testMergeRangeWriter(): void
+    {
+        $mergeRange = 'B2:C3';
+        $spreadsheet = new Spreadsheet();
+        $worksheet = $spreadsheet->getActiveSheet();
+        $worksheet->setCellValue('B2', "Merge Range {$mergeRange}");
+        $worksheet->mergeCells($mergeRange);
+
+        $reloaded = $this->writeAndReload($spreadsheet, 'Ods');
+
+        $cell = $reloaded->getActiveSheet()->getCell('B2');
+        self::assertTrue($cell->isInMergeRange());
+        self::assertSame($mergeRange, $cell->getMergeRange());
+    }
+}