Adding tests for BufferedIterator

tests/TestCase/Collection/Iterator/BufferedIteratorTest.php

@@ -0,0 +1,70 @@
+<?php
+/**
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         3.0.0
+ * @license       http://www.opensource.org/licenses/mit-license.php MIT License
+ */
+namespace Cake\Test\TestCase\Collection\Iterator;
+
+use ArrayObject;
+use Cake\Collection\Iterator\BufferedIterator;
+use Cake\TestSuite\TestCase;
+use NoRewindIterator;
+
+/**
+ * BufferedIterator Test
+ *
+ */
+class BufferedIteratorTest extends TestCase {
+
+/**
+ * Tests that items are cached once iterated over them
+ *
+ * @return void
+ */
+	public function testBuffer() {
+		$items = new ArrayObject([
+			'a' => 1,
+			'b' => 2,
+			'c' => 3
+		]);
+		$iterator = new BufferedIterator($items);
+		$expected = (array)$items;
+		$this->assertSame($expected, $iterator->toArray());
+
+		$items['c'] = 5;
+		$buffered = $iterator->toArray();
+		$this->assertSame($expected, $buffered);
+	}
+
+/**
+ * Tests that items are cached once iterated over them
+ *
+ * @return void
+ */
+	public function testCount() {
+		$items = new ArrayObject([
+			'a' => 1,
+			'b' => 2,
+			'c' => 3
+		]);
+		$iterator = new BufferedIterator($items);
+		$this->assertCount(3, $iterator);
+		$buffered = $iterator->toArray();
+		$this->assertSame((array)$items, $buffered);
+
+		$iterator =  new BufferedIterator(new NoRewindIterator($items->getIterator()));
+		$this->assertCount(3, $iterator);
+		$buffered = $iterator->toArray();
+		$this->assertSame((array)$items, $buffered);
+	}
+
+}