add LightCache support

tests/ZM/Store/KV/LightCacheTest.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\ZM\Store\KV;
+
+use PHPUnit\Framework\TestCase;
+use ZM\Store\KV\LightCache;
+
+/**
+ * @internal
+ */
+class LightCacheTest extends TestCase
+{
+    public function testRemoveSelf()
+    {
+        $a = LightCache::open('asd');
+        $this->assertInstanceOf(LightCache::class, $a);
+        /* @phpstan-ignore-next-line */
+        $this->assertTrue($a->removeSelf());
+    }
+
+    public function testSet()
+    {
+        $this->assertTrue(LightCache::open()->set('test123', 'help'));
+    }
+
+    public function testIsset()
+    {
+        $this->assertFalse(LightCache::open()->isset('test111'));
+    }
+
+    public function testGet()
+    {
+        LightCache::open('ppp')->set('hello', 'world');
+        $this->assertSame(LightCache::open('ppp')->get('hello', 'ffff'), 'world');
+    }
+
+    public function testUnset()
+    {
+        $kv = LightCache::open('sss');
+        $kv->set('test', 'test');
+        $this->assertSame($kv->get('test'), 'test');
+        $kv->unset('test');
+        $this->assertNull($kv->get('test'));
+    }
+}