Bugfixed SharedMemoryBlock, added tests

tests/Shm/SharedMemoryBlockTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace NoccyLabs\Ipc\Shm;
+
+use NoccyLabs\Ipc\Key\FileKey;
+
+
+
+
+
+class SharedMemoryBlockTest extends \PhpUnit\Framework\TestCase
+{
+    public function testWritingAndReading()
+    {
+        $key = new FileKey(__DIR__);
+        $shm = new SharedMemoryBlock($key, SharedMemoryBlock::FLAG_CREATE, 64);
+
+        $this->assertEquals(11, $shm->write("Hello World", 0));
+        $this->assertEquals("Hello World", $shm->read(11, 0));
+        $this->assertEquals(3, $shm->write("foo", 2));
+        $this->assertEquals("Hefoo World", $shm->read(11, 0));
+    
+        $shm->destroy();
+    }
+}