PHPC-225: Test Cursor::isDead() and kill on destruct

Testing for kill on destruct is based on PyMongo (see: https://jira.mongodb.org/browse/SERVER-5816?focusedCommentId=201245).

Author: jmikola

tests/standalone/cursor-destruct-001.phpt

@@ -0,0 +1,40 @@
+--TEST--
+MongoDB\Driver\Cursor destruct should kill a live cursor
+--SKIPIF--
+<?php require __DIR__ . "/../utils/basic-skipif.inc"; CLEANUP(STANDALONE) ?>
+--FILE--
+<?php
+require_once __DIR__ . "/../utils/basic.inc";
+
+function getNumOpenCursors(MongoDB\Driver\Manager $manager)
+{
+    $cursor = $manager->executeCommand(DATABASE_NAME, new MongoDB\Driver\Command(array('serverStatus' => 1)));
+    $result = current($cursor->toArray());
+    return $result['cursors']->totalOpen;
+}
+
+$manager = new MongoDB\Driver\Manager(STANDALONE);
+
+$manager->executeInsert(NS, array('_id' => 1));
+$manager->executeInsert(NS, array('_id' => 2));
+$manager->executeInsert(NS, array('_id' => 3));
+
+$numOpenCursorsBeforeQuery = getNumOpenCursors($manager);
+
+$cursor = $manager->executeQuery(NS, new MongoDB\Driver\Query(array(), array('batchSize' => 2)));
+
+var_dump($cursor->isDead());
+var_dump(getNumOpenCursors($manager) == $numOpenCursorsBeforeQuery + 1);
+
+unset($cursor);
+
+var_dump(getNumOpenCursors($manager) == $numOpenCursorsBeforeQuery);
+
+?>
+===DONE===
+<?php exit(0); ?>
+--EXPECT--
+bool(false)
+bool(true)
+bool(true)
+===DONE===

tests/standalone/cursor-isDead-001.phpt

@@ -0,0 +1,28 @@
+--TEST--
+MongoDB\Driver\Cursor::isDead()
+--SKIPIF--
+<?php require __DIR__ . "/../utils/basic-skipif.inc"; CLEANUP(STANDALONE) ?>
+--FILE--
+<?php
+require_once __DIR__ . "/../utils/basic.inc";
+
+$manager = new MongoDB\Driver\Manager(STANDALONE);
+
+$manager->executeInsert(NS, array('_id' => 1));
+$manager->executeInsert(NS, array('_id' => 2));
+$manager->executeInsert(NS, array('_id' => 3));
+
+$cursor = $manager->executeQuery(NS, new MongoDB\Driver\Query(array(), array('batchSize' => 2)));
+
+foreach ($cursor as $_) {
+    var_dump($cursor->isDead());
+}
+
+?>
+===DONE===
+<?php exit(0); ?>
+--EXPECT--
+bool(false)
+bool(false)
+bool(true)
+===DONE===