Add test for memory leak prevention while inserting blobs

tests/MemoryTest.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Aerospike;
+
+use PHPUnit\Framework\TestCase;
+
+final class MemoryTest extends TestCase
+{
+    protected static Client $client;
+
+    protected static string $namespace = 'test';
+    protected static string $set = 'test';
+    protected static string $socket = '/tmp/asld_grpc.sock';
+
+    public static function setUpBeforeClass(): void
+    {
+        self::$client = Client::connect(self::$socket);
+    }
+
+    public function testBlobOnPut(): void
+    {
+        $memoryAtStart = memory_get_usage();
+
+        $this->doTest();
+
+        $memoryUsage = memory_get_usage() - $memoryAtStart;
+
+        // Memory difference must be less than 1KB
+        $this->assertLessThan(
+            1024,
+            $memoryUsage,
+            sprintf('Memory leak detected! Expected memory increase is less than 1024, but got: %s bytes', $memoryUsage)
+        );
+    }
+
+    private function doTest(): void
+    {
+        $wp = new WritePolicy();
+        $key = new Key(self::$namespace, self::$set, 1);
+
+        for ($i = 0; $i < 10_000; $i++) {
+            self::$client->put($wp, $key, [new Bin('binName', Value::blob('some value'))]);
+        }
+    }
+}