using tests from original is_email function (#104)

Tests/EmailValidator/Validation/IsEmailFunctionTests.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Egulias\Tests\EmailValidator\Validation;
+
+use Egulias\EmailValidator\EmailValidator;
+use Egulias\EmailValidator\Validation\DNSCheckValidation;
+use Egulias\EmailValidator\Validation\MultipleValidationWithAnd;
+use Egulias\EmailValidator\Validation\NoRFCWarningsValidation;
+use Egulias\EmailValidator\Validation\RFCValidation;
+
+class IsEmailFunctionTests extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider isEmailTestSuite
+     */
+    public function testAgainstIsEmailTestSuite($email)
+    {
+        $validator = new EmailValidator();
+        $validations = new MultipleValidationWithAnd([
+            new NoRFCWarningsValidation(),
+            new DNSCheckValidation()
+        ]);
+
+        $this->assertFalse($validator->isValid($email, $validations), "Tested email " . $email);
+
+    }
+
+    public function isEmailTestSuite()
+    {
+        $testSuite = dirname(__FILE__) . '/../../resources/is_email_tests.xml';
+		$document = new \DOMDocument();
+		$document->load($testSuite);
+        $elements = $document->getElementsByTagName('test');
+        $tests = [];
+
+        foreach($elements as $testElement) {
+            $childNode = $testElement->childNodes;
+            $tests[][] = ($childNode->item(1)->getAttribute('value'));
+        }
+
+        return $tests;
+    }
+
+}