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diff --git a/vendor/symfony/http-kernel/Tests/HttpCache/EsiTest.php b/vendor/symfony/http-kernel/Tests/HttpCache/EsiTest.php
new file mode 100644
index 000000000..28a566e0d
--- /dev/null
+++ b/vendor/symfony/http-kernel/Tests/HttpCache/EsiTest.php
@@ -0,0 +1,248 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Tests\HttpCache;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpKernel\HttpCache\Esi;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class EsiTest extends TestCase
+{
+    public function testHasSurrogateEsiCapability()
+    {
+        $esi = new Esi();
+
+        $request = Request::create('/');
+        $request->headers->set('Surrogate-Capability', 'abc="ESI/1.0"');
+        $this->assertTrue($esi->hasSurrogateCapability($request));
+
+        $request = Request::create('/');
+        $request->headers->set('Surrogate-Capability', 'foobar');
+        $this->assertFalse($esi->hasSurrogateCapability($request));
+
+        $request = Request::create('/');
+        $this->assertFalse($esi->hasSurrogateCapability($request));
+    }
+
+    public function testAddSurrogateEsiCapability()
+    {
+        $esi = new Esi();
+
+        $request = Request::create('/');
+        $esi->addSurrogateCapability($request);
+        $this->assertEquals('symfony2="ESI/1.0"', $request->headers->get('Surrogate-Capability'));
+
+        $esi->addSurrogateCapability($request);
+        $this->assertEquals('symfony2="ESI/1.0", symfony2="ESI/1.0"', $request->headers->get('Surrogate-Capability'));
+    }
+
+    public function testAddSurrogateControl()
+    {
+        $esi = new Esi();
+
+        $response = new Response('foo <esi:include src="" />');
+        $esi->addSurrogateControl($response);
+        $this->assertEquals('content="ESI/1.0"', $response->headers->get('Surrogate-Control'));
+
+        $response = new Response('foo');
+        $esi->addSurrogateControl($response);
+        $this->assertEquals('', $response->headers->get('Surrogate-Control'));
+    }
+
+    public function testNeedsEsiParsing()
+    {
+        $esi = new Esi();
+
+        $response = new Response();
+        $response->headers->set('Surrogate-Control', 'content="ESI/1.0"');
+        $this->assertTrue($esi->needsParsing($response));
+
+        $response = new Response();
+        $this->assertFalse($esi->needsParsing($response));
+    }
+
+    public function testRenderIncludeTag()
+    {
+        $esi = new Esi();
+
+        $this->assertEquals('<esi:include src="/" onerror="continue" alt="/alt" />', $esi->renderIncludeTag('/', '/alt', true));
+        $this->assertEquals('<esi:include src="/" alt="/alt" />', $esi->renderIncludeTag('/', '/alt', false));
+        $this->assertEquals('<esi:include src="/" onerror="continue" />', $esi->renderIncludeTag('/'));
+        $this->assertEquals('<esi:comment text="some comment" />'."\n".'<esi:include src="/" onerror="continue" alt="/alt" />', $esi->renderIncludeTag('/', '/alt', true, 'some comment'));
+    }
+
+    public function testProcessDoesNothingIfContentTypeIsNotHtml()
+    {
+        $esi = new Esi();
+
+        $request = Request::create('/');
+        $response = new Response();
+        $response->headers->set('Content-Type', 'text/plain');
+        $esi->process($request, $response);
+
+        $this->assertFalse($response->headers->has('x-body-eval'));
+    }
+
+    public function testMultilineEsiRemoveTagsAreRemoved()
+    {
+        $esi = new Esi();
+
+        $request = Request::create('/');
+        $response = new Response('<esi:remove> <a href="http://www.example.com">www.example.com</a> </esi:remove> Keep this'."<esi:remove>\n <a>www.example.com</a> </esi:remove> And this");
+        $esi->process($request, $response);
+
+        $this->assertEquals(' Keep this And this', $response->getContent());
+    }
+
+    public function testCommentTagsAreRemoved()
+    {
+        $esi = new Esi();
+
+        $request = Request::create('/');
+        $response = new Response('<esi:comment text="some comment &gt;" /> Keep this');
+        $esi->process($request, $response);
+
+        $this->assertEquals(' Keep this', $response->getContent());
+    }
+
+    public function testProcess()
+    {
+        $esi = new Esi();
+
+        $request = Request::create('/');
+        $response = new Response('foo <esi:comment text="some comment" /><esi:include src="..." alt="alt" onerror="continue" />');
+        $esi->process($request, $response);
+
+        $this->assertEquals('foo <?php echo $this->surrogate->handle($this, \'...\', \'alt\', true) ?>'."\n", $response->getContent());
+        $this->assertEquals('ESI', $response->headers->get('x-body-eval'));
+
+        $response = new Response('foo <esi:comment text="some comment" /><esi:include src="foo\'" alt="bar\'" onerror="continue" />');
+        $esi->process($request, $response);
+
+        $this->assertEquals('foo <?php echo $this->surrogate->handle($this, \'foo\\\'\', \'bar\\\'\', true) ?>'."\n", $response->getContent());
+
+        $response = new Response('foo <esi:include src="..." />');
+        $esi->process($request, $response);
+
+        $this->assertEquals('foo <?php echo $this->surrogate->handle($this, \'...\', \'\', false) ?>'."\n", $response->getContent());
+
+        $response = new Response('foo <esi:include src="..."></esi:include>');
+        $esi->process($request, $response);
+
+        $this->assertEquals('foo <?php echo $this->surrogate->handle($this, \'...\', \'\', false) ?>'."\n", $response->getContent());
+    }
+
+    public function testProcessEscapesPhpTags()
+    {
+        $esi = new Esi();
+
+        $request = Request::create('/');
+        $response = new Response('<?php <? <% <script language=php>');
+        $esi->process($request, $response);
+
+        $this->assertEquals('<?php echo "<?"; ?>php <?php echo "<?"; ?> <?php echo "<%"; ?> <?php echo "<s"; ?>cript language=php>', $response->getContent());
+    }
+
+    /**
+     * @expectedException \RuntimeException
+     */
+    public function testProcessWhenNoSrcInAnEsi()
+    {
+        $esi = new Esi();
+
+        $request = Request::create('/');
+        $response = new Response('foo <esi:include />');
+        $esi->process($request, $response);
+    }
+
+    public function testProcessRemoveSurrogateControlHeader()
+    {
+        $esi = new Esi();
+
+        $request = Request::create('/');
+        $response = new Response('foo <esi:include src="..." />');
+        $response->headers->set('Surrogate-Control', 'content="ESI/1.0"');
+        $esi->process($request, $response);
+        $this->assertEquals('ESI', $response->headers->get('x-body-eval'));
+
+        $response->headers->set('Surrogate-Control', 'no-store, content="ESI/1.0"');
+        $esi->process($request, $response);
+        $this->assertEquals('ESI', $response->headers->get('x-body-eval'));
+        $this->assertEquals('no-store', $response->headers->get('surrogate-control'));
+
+        $response->headers->set('Surrogate-Control', 'content="ESI/1.0", no-store');
+        $esi->process($request, $response);
+        $this->assertEquals('ESI', $response->headers->get('x-body-eval'));
+        $this->assertEquals('no-store', $response->headers->get('surrogate-control'));
+    }
+
+    public function testHandle()
+    {
+        $esi = new Esi();
+        $cache = $this->getCache(Request::create('/'), new Response('foo'));
+        $this->assertEquals('foo', $esi->handle($cache, '/', '/alt', true));
+    }
+
+    /**
+     * @expectedException \RuntimeException
+     */
+    public function testHandleWhenResponseIsNot200()
+    {
+        $esi = new Esi();
+        $response = new Response('foo');
+        $response->setStatusCode(404);
+        $cache = $this->getCache(Request::create('/'), $response);
+        $esi->handle($cache, '/', '/alt', false);
+    }
+
+    public function testHandleWhenResponseIsNot200AndErrorsAreIgnored()
+    {
+        $esi = new Esi();
+        $response = new Response('foo');
+        $response->setStatusCode(404);
+        $cache = $this->getCache(Request::create('/'), $response);
+        $this->assertEquals('', $esi->handle($cache, '/', '/alt', true));
+    }
+
+    public function testHandleWhenResponseIsNot200AndAltIsPresent()
+    {
+        $esi = new Esi();
+        $response1 = new Response('foo');
+        $response1->setStatusCode(404);
+        $response2 = new Response('bar');
+        $cache = $this->getCache(Request::create('/'), array($response1, $response2));
+        $this->assertEquals('bar', $esi->handle($cache, '/', '/alt', false));
+    }
+
+    protected function getCache($request, $response)
+    {
+        $cache = $this->getMockBuilder('Symfony\Component\HttpKernel\HttpCache\HttpCache')->setMethods(array('getRequest', 'handle'))->disableOriginalConstructor()->getMock();
+        $cache->expects($this->any())
+              ->method('getRequest')
+              ->will($this->returnValue($request))
+        ;
+        if (is_array($response)) {
+            $cache->expects($this->any())
+                  ->method('handle')
+                  ->will(call_user_func_array(array($this, 'onConsecutiveCalls'), $response))
+            ;
+        } else {
+            $cache->expects($this->any())
+                  ->method('handle')
+                  ->will($this->returnValue($response))
+            ;
+        }
+
+        return $cache;
+    }
+}