faster spreadsheet exporter based on opensout and other export improvements (#5238)

tests/Export/Package/SpoutSpreadsheetTest.php

@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Export\Package;
+
+use App\Export\Package\SpoutSpreadsheet;
+use OpenSpout\Writer\CSV\Writer;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \App\Export\Package\SpoutSpreadsheet
+ */
+class SpoutSpreadsheetTest extends TestCase
+{
+    private string $filename;
+    private int $counter = 1;
+
+    protected function setUp(): void
+    {
+        $this->filename = realpath(__DIR__ . '/../../_data/') . '/test' . $this->counter++ . '.xlsx';
+    }
+
+    protected function tearDown(): void
+    {
+        if (file_exists($this->filename)) {
+            unlink($this->filename);
+        }
+    }
+
+    public function testsaveWritesFile(): void
+    {
+        $spreadsheetPackage = new SpoutSpreadsheet(new Writer());
+        $spreadsheetPackage->open($this->filename);
+        $spreadsheetPackage->setHeader(['Foo', 'Bar']);
+        $spreadsheetPackage->addRow(['Data1', 'Data2']);
+        $spreadsheetPackage->addRow(['Data3', 'Data4']);
+        $spreadsheetPackage->save();
+
+        self::assertGreaterThan(0, filesize($this->filename));
+    }
+}