Add pear modules, mail and net_smtp via composer (#93)

Add pear modules, mail and net_smtp via composer, remove php 5.6 build due to phpunit 6

lib/composer/vendor/phar-io/manifest/tests/values/RequirementCollectionTest.php

@@ -0,0 +1,63 @@
+<?php
+/*
+ * This file is part of PharIo\Manifest.
+ *
+ * (c) Arne Blankerts <arne@blankerts.de>, Sebastian Heuer <sebastian@phpeople.de>, Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace PharIo\Manifest;
+
+use PharIo\Version\ExactVersionConstraint;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \PharIo\Manifest\RequirementCollection
+ * @covers \PharIo\Manifest\RequirementCollectionIterator
+ *
+ * @uses \PharIo\Manifest\PhpVersionRequirement
+ * @uses \PharIo\Version\VersionConstraint
+ */
+class RequirementCollectionTest extends TestCase {
+    /**
+     * @var RequirementCollection
+     */
+    private $collection;
+
+    /**
+     * @var Requirement
+     */
+    private $item;
+
+    protected function setUp() {
+        $this->collection = new RequirementCollection;
+        $this->item       = new PhpVersionRequirement(new ExactVersionConstraint('7.1.0'));
+    }
+
+    public function testCanBeCreated() {
+        $this->assertInstanceOf(RequirementCollection::class, $this->collection);
+    }
+
+    public function testCanBeCounted() {
+        $this->collection->add($this->item);
+
+        $this->assertCount(1, $this->collection);
+    }
+
+    public function testCanBeIterated() {
+        $this->collection->add(new PhpVersionRequirement(new ExactVersionConstraint('5.6.0')));
+        $this->collection->add($this->item);
+
+        $this->assertContains($this->item, $this->collection);
+    }
+
+    public function testKeyPositionCanBeRetreived() {
+        $this->collection->add($this->item);
+        foreach($this->collection as $key => $item) {
+            $this->assertEquals(0, $key);
+        }
+    }
+
+}