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diff --git a/vendor/symfony/expression-language/Tests/LexerTest.php b/vendor/symfony/expression-language/Tests/LexerTest.php
new file mode 100644
index 000000000..87c16f707
--- /dev/null
+++ b/vendor/symfony/expression-language/Tests/LexerTest.php
@@ -0,0 +1,121 @@
+<?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\ExpressionLanguage\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\ExpressionLanguage\Lexer;
+use Symfony\Component\ExpressionLanguage\Token;
+use Symfony\Component\ExpressionLanguage\TokenStream;
+
+class LexerTest extends TestCase
+{
+    /**
+     * @var Lexer
+     */
+    private $lexer;
+
+    protected function setUp()
+    {
+        $this->lexer = new Lexer();
+    }
+
+    /**
+     * @dataProvider getTokenizeData
+     */
+    public function testTokenize($tokens, $expression)
+    {
+        $tokens[] = new Token('end of expression', null, strlen($expression) + 1);
+        $this->assertEquals(new TokenStream($tokens, $expression), $this->lexer->tokenize($expression));
+    }
+
+    /**
+     * @expectedException \Symfony\Component\ExpressionLanguage\SyntaxError
+     * @expectedExceptionMessage Unexpected character "'" around position 33 for expression `service(faulty.expression.example').dummyMethod()`.
+     */
+    public function testTokenizeThrowsErrorWithMessage()
+    {
+        $expression = "service(faulty.expression.example').dummyMethod()";
+        $this->lexer->tokenize($expression);
+    }
+
+    /**
+     * @expectedException \Symfony\Component\ExpressionLanguage\SyntaxError
+     * @expectedExceptionMessage Unclosed "(" around position 7 for expression `service(unclosed.expression.dummyMethod()`.
+     */
+    public function testTokenizeThrowsErrorOnUnclosedBrace()
+    {
+        $expression = 'service(unclosed.expression.dummyMethod()';
+        $this->lexer->tokenize($expression);
+    }
+
+    public function getTokenizeData()
+    {
+        return array(
+            array(
+                array(new Token('name', 'a', 3)),
+                '  a  ',
+            ),
+            array(
+                array(new Token('name', 'a', 1)),
+                'a',
+            ),
+            array(
+                array(new Token('string', 'foo', 1)),
+                '"foo"',
+            ),
+            array(
+                array(new Token('number', '3', 1)),
+                '3',
+            ),
+            array(
+                array(new Token('operator', '+', 1)),
+                '+',
+            ),
+            array(
+                array(new Token('punctuation', '.', 1)),
+                '.',
+            ),
+            array(
+                array(
+                    new Token('punctuation', '(', 1),
+                    new Token('number', '3', 2),
+                    new Token('operator', '+', 4),
+                    new Token('number', '5', 6),
+                    new Token('punctuation', ')', 7),
+                    new Token('operator', '~', 9),
+                    new Token('name', 'foo', 11),
+                    new Token('punctuation', '(', 14),
+                    new Token('string', 'bar', 15),
+                    new Token('punctuation', ')', 20),
+                    new Token('punctuation', '.', 21),
+                    new Token('name', 'baz', 22),
+                    new Token('punctuation', '[', 25),
+                    new Token('number', '4', 26),
+                    new Token('punctuation', ']', 27),
+                ),
+                '(3 + 5) ~ foo("bar").baz[4]',
+            ),
+            array(
+                array(new Token('operator', '..', 1)),
+                '..',
+            ),
+            array(
+                array(new Token('string', '#foo', 1)),
+                "'#foo'",
+            ),
+            array(
+                array(new Token('string', '#foo', 1)),
+                '"#foo"',
+            ),
+        );
+    }
+}