added tests

tests/bootstrap.php

@@ -0,0 +1,10 @@
+<?php
+
+require __DIR__ . "/../vendor/autoload.php";
+
+$client = new \crodas\InfluxPHP\Client;
+foreach ($client->getDatabases() as $db) {
+    if (preg_match("/^test_/", $db->getName())) {
+        $db->drop();
+    }
+}