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diff --git a/vendor/symfony/expression-language/Tests/ExpressionLanguageTest.php b/vendor/symfony/expression-language/Tests/ExpressionLanguageTest.php
new file mode 100644
index 000000000..07f4b1e8a
--- /dev/null
+++ b/vendor/symfony/expression-language/Tests/ExpressionLanguageTest.php
@@ -0,0 +1,197 @@
+<?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 Symfony\Component\ExpressionLanguage\ExpressionFunction;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
+use Symfony\Component\ExpressionLanguage\Tests\Fixtures\TestProvider;
+
+class ExpressionLanguageTest extends TestCase
+{
+    public function testCachedParse()
+    {
+        $cacheMock = $this->getMockBuilder('Symfony\Component\ExpressionLanguage\ParserCache\ParserCacheInterface')->getMock();
+        $savedParsedExpression = null;
+        $expressionLanguage = new ExpressionLanguage($cacheMock);
+
+        $cacheMock
+            ->expects($this->exactly(2))
+            ->method('fetch')
+            ->with('1 + 1//')
+            ->will($this->returnCallback(function () use (&$savedParsedExpression) {
+                return $savedParsedExpression;
+            }))
+        ;
+        $cacheMock
+            ->expects($this->exactly(1))
+            ->method('save')
+            ->with('1 + 1//', $this->isInstanceOf('Symfony\Component\ExpressionLanguage\ParsedExpression'))
+            ->will($this->returnCallback(function ($key, $expression) use (&$savedParsedExpression) {
+                $savedParsedExpression = $expression;
+            }))
+        ;
+
+        $parsedExpression = $expressionLanguage->parse('1 + 1', array());
+        $this->assertSame($savedParsedExpression, $parsedExpression);
+
+        $parsedExpression = $expressionLanguage->parse('1 + 1', array());
+        $this->assertSame($savedParsedExpression, $parsedExpression);
+    }
+
+    public function testConstantFunction()
+    {
+        $expressionLanguage = new ExpressionLanguage();
+        $this->assertEquals(PHP_VERSION, $expressionLanguage->evaluate('constant("PHP_VERSION")'));
+
+        $expressionLanguage = new ExpressionLanguage();
+        $this->assertEquals('constant("PHP_VERSION")', $expressionLanguage->compile('constant("PHP_VERSION")'));
+    }
+
+    public function testProviders()
+    {
+        $expressionLanguage = new ExpressionLanguage(null, array(new TestProvider()));
+        $this->assertEquals('foo', $expressionLanguage->evaluate('identity("foo")'));
+        $this->assertEquals('"foo"', $expressionLanguage->compile('identity("foo")'));
+    }
+
+    /**
+     * @dataProvider shortCircuitProviderEvaluate
+     */
+    public function testShortCircuitOperatorsEvaluate($expression, array $values, $expected)
+    {
+        $expressionLanguage = new ExpressionLanguage();
+        $this->assertEquals($expected, $expressionLanguage->evaluate($expression, $values));
+    }
+
+    /**
+     * @dataProvider shortCircuitProviderCompile
+     */
+    public function testShortCircuitOperatorsCompile($expression, array $names, $expected)
+    {
+        $result = null;
+        $expressionLanguage = new ExpressionLanguage();
+        eval(sprintf('$result = %s;', $expressionLanguage->compile($expression, $names)));
+        $this->assertSame($expected, $result);
+    }
+
+    public function shortCircuitProviderEvaluate()
+    {
+        $object = $this->getMockBuilder('stdClass')->setMethods(array('foo'))->getMock();
+        $object->expects($this->never())->method('foo');
+
+        return array(
+            array('false and object.foo()', array('object' => $object), false),
+            array('false && object.foo()', array('object' => $object), false),
+            array('true || object.foo()', array('object' => $object), true),
+            array('true or object.foo()', array('object' => $object), true),
+        );
+    }
+
+    public function shortCircuitProviderCompile()
+    {
+        return array(
+            array('false and foo', array('foo' => 'foo'), false),
+            array('false && foo', array('foo' => 'foo'), false),
+            array('true || foo', array('foo' => 'foo'), true),
+            array('true or foo', array('foo' => 'foo'), true),
+        );
+    }
+
+    public function testCachingForOverriddenVariableNames()
+    {
+        $expressionLanguage = new ExpressionLanguage();
+        $expression = 'a + b';
+        $expressionLanguage->evaluate($expression, array('a' => 1, 'b' => 1));
+        $result = $expressionLanguage->compile($expression, array('a', 'B' => 'b'));
+        $this->assertSame('($a + $B)', $result);
+    }
+
+    public function testCachingWithDifferentNamesOrder()
+    {
+        $cacheMock = $this->getMockBuilder('Symfony\Component\ExpressionLanguage\ParserCache\ParserCacheInterface')->getMock();
+        $expressionLanguage = new ExpressionLanguage($cacheMock);
+        $savedParsedExpressions = array();
+        $cacheMock
+            ->expects($this->exactly(2))
+            ->method('fetch')
+            ->will($this->returnCallback(function ($key) use (&$savedParsedExpressions) {
+                return isset($savedParsedExpressions[$key]) ? $savedParsedExpressions[$key] : null;
+            }))
+        ;
+        $cacheMock
+            ->expects($this->exactly(1))
+            ->method('save')
+            ->will($this->returnCallback(function ($key, $expression) use (&$savedParsedExpressions) {
+                $savedParsedExpressions[$key] = $expression;
+            }))
+        ;
+
+        $expression = 'a + b';
+        $expressionLanguage->compile($expression, array('a', 'B' => 'b'));
+        $expressionLanguage->compile($expression, array('B' => 'b', 'a'));
+    }
+
+    /**
+     * @dataProvider getRegisterCallbacks
+     * @expectedException \LogicException
+     */
+    public function testRegisterAfterParse($registerCallback)
+    {
+        $el = new ExpressionLanguage();
+        $el->parse('1 + 1', array());
+        $registerCallback($el);
+    }
+
+    /**
+     * @dataProvider getRegisterCallbacks
+     * @expectedException \LogicException
+     */
+    public function testRegisterAfterEval($registerCallback)
+    {
+        $el = new ExpressionLanguage();
+        $el->evaluate('1 + 1');
+        $registerCallback($el);
+    }
+
+    /**
+     * @dataProvider getRegisterCallbacks
+     * @expectedException \LogicException
+     */
+    public function testRegisterAfterCompile($registerCallback)
+    {
+        $el = new ExpressionLanguage();
+        $el->compile('1 + 1');
+        $registerCallback($el);
+    }
+
+    public function getRegisterCallbacks()
+    {
+        return array(
+            array(
+                function (ExpressionLanguage $el) {
+                    $el->register('fn', function () {}, function () {});
+                },
+            ),
+            array(
+                function (ExpressionLanguage $el) {
+                    $el->addFunction(new ExpressionFunction('fn', function () {}, function () {}));
+                },
+            ),
+            array(
+                function (ExpressionLanguage $el) {
+                    $el->registerProvider(new TestProvider());
+                },
+            ),
+        );
+    }
+}