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

tests/Export/Package/CellFormatter/DefaultFormatterTest.php

@@ -0,0 +1,56 @@
+<?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\CellFormatter;
+
+use App\Export\Package\CellFormatter\DefaultFormatter;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \App\Export\Package\CellFormatter\DefaultFormatter
+ */
+class DefaultFormatterTest extends TestCase
+{
+    public function testFormatValueReturnsSameValueForScalar(): void
+    {
+        $formatter = new DefaultFormatter();
+        $result = $formatter->formatValue('string');
+        self::assertEquals('string', $result);
+
+        $result = $formatter->formatValue(123);
+        self::assertEquals(123, $result);
+
+        $result = $formatter->formatValue(45.67);
+        self::assertEquals(45.67, $result);
+
+        $result = $formatter->formatValue(true);
+        self::assertTrue($result);
+
+        $result = $formatter->formatValue(null);
+        self::assertNull($result);
+    }
+
+    public function testFormatValueThrowsExceptionForNonScalar(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Only scalar values are supported');
+
+        $formatter = new DefaultFormatter();
+        $formatter->formatValue([]);
+    }
+
+    public function testFormatValueThrowsExceptionForObject(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Only scalar values are supported');
+
+        $formatter = new DefaultFormatter();
+        $formatter->formatValue(new \stdClass());
+    }
+}