Added testing

tests/TransactionTest.php

@@ -0,0 +1,19 @@
+<?php
+use PHPUnit\Framework\TestCase;
+use ProVM\Database\Transaction;
+
+class TransactionTest extends TestCase
+{
+    public function testTransaction()
+    {
+        $connection = $this->createMock(ProVM\Concept\Database\Connection::class);
+        $transaction = new Transaction($connection);
+        $transaction->begin();
+        $this->assertTrue(true);
+        $transaction->commit();
+        $this->assertTrue(true);
+        $transaction->begin();
+        $transaction->rollback();
+        $this->assertTrue(true);
+    }
+}