Adding JsonConverter benchmark

src/JsonConverterBench.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace League\Csv;
+
+use PhpBench\Attributes as Bench;
+use const SEEK_END;
+
+final class JsonConverterBench
+{
+    #[Bench\OutputTimeUnit('seconds')]
+    #[Bench\Assert('mode(variant.mem.peak) <= 8000000'), Bench\Assert('mode(variant.time.avg) < 10000000')]
+    public function benchUsingJsonEncode(): void
+    {
+        $document = $this->getDocument();
+        $tmpFile = tmpfile();
+        $bytes = fwrite($tmpFile, json_encode($document)); /* @phpstan-ignore-line */
+
+        fseek($tmpFile, 0, SEEK_END);
+        assert($bytes === ftell($tmpFile));
+    }
+
+    #[Bench\OutputTimeUnit('seconds')]
+    #[Bench\Assert('mode(variant.mem.peak) < 4000000'), Bench\Assert('mode(variant.time.avg) < 10000000')]
+    public function benchUsingDefaultJsonConverter(): void
+    {
+        $document = $this->getDocument();
+        $tmpFile = tmpfile();
+        $bytes = JsonConverter::create()->save($document, $tmpFile);
+
+        fseek($tmpFile, 0, SEEK_END);
+        assert($bytes === ftell($tmpFile));
+    }
+
+    #[Bench\OutputTimeUnit('seconds')]
+    #[Bench\Assert('mode(variant.mem.peak) < 4000000'), Bench\Assert('mode(variant.time.avg) < 10000000')]
+    public function benchUsingJsonConverterWithForceObject(): void
+    {
+        $document = $this->getDocument();
+        $tmpFile = tmpfile();
+        $bytes = JsonConverter::create()->withForceObject()->save($document, $tmpFile);
+
+        fseek($tmpFile, 0, SEEK_END);
+        assert($bytes === ftell($tmpFile));
+    }
+
+    #[Bench\OutputTimeUnit('seconds')]
+    #[Bench\Assert('mode(variant.mem.peak) < 4000000'), Bench\Assert('mode(variant.time.avg) < 10000000')]
+    public function benchUsingJsonConverterWithPrettyPrint(): void
+    {
+        $document = $this->getDocument();
+        $tmpFile = tmpfile();
+        $bytes = JsonConverter::create()->withPrettyPrint()->save($document, $tmpFile);
+
+        fseek($tmpFile, 0, SEEK_END);
+        assert($bytes === ftell($tmpFile));
+    }
+
+    #[Bench\OutputTimeUnit('seconds')]
+    #[Bench\Assert('mode(variant.mem.peak) < 4000000'), Bench\Assert('mode(variant.time.avg) < 10000000')]
+    public function benchUsingJsonConverterWithSmallChunkSize(): void
+    {
+        $document = $this->getDocument();
+        $tmpFile = tmpfile();
+        $bytes = JsonConverter::create()->chunkSize(1)->save($document, $tmpFile);
+
+        fseek($tmpFile, 0, SEEK_END);
+        assert($bytes === ftell($tmpFile));
+    }
+
+    private function getDocument(): Reader
+    {
+        $document = Reader::createFromPath(dirname(__DIR__).'/test_files/prenoms.csv');
+        $document->setHeaderOffset(0);
+        $document->setDelimiter(';');
+        CharsetConverter::addTo($document, 'iso-8859-15', 'utf-8');
+
+        return $document;
+    }
+}