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diff --git a/vendor/symfony/dependency-injection/Tests/ParameterBag/EnvPlaceholderParameterBagTest.php b/vendor/symfony/dependency-injection/Tests/ParameterBag/EnvPlaceholderParameterBagTest.php
new file mode 100644
index 000000000..01fcd2c3e
--- /dev/null
+++ b/vendor/symfony/dependency-injection/Tests/ParameterBag/EnvPlaceholderParameterBagTest.php
@@ -0,0 +1,165 @@
+<?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\DependencyInjection\Tests\ParameterBag;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag;
+
+class EnvPlaceholderParameterBagTest extends TestCase
+{
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
+     */
+    public function testGetThrowsInvalidArgumentExceptionIfEnvNameContainsNonWordCharacters()
+    {
+        $bag = new EnvPlaceholderParameterBag();
+        $bag->get('env(%foo%)');
+    }
+
+    public function testMergeWillNotDuplicateIdenticalParameters()
+    {
+        $envVariableName = 'DB_HOST';
+        $parameter = sprintf('env(%s)', $envVariableName);
+        $firstBag = new EnvPlaceholderParameterBag();
+
+        // initialize placeholders
+        $firstBag->get($parameter);
+        $secondBag = clone $firstBag;
+
+        $firstBag->mergeEnvPlaceholders($secondBag);
+        $mergedPlaceholders = $firstBag->getEnvPlaceholders();
+
+        $placeholderForVariable = $mergedPlaceholders[$envVariableName];
+        $placeholder = array_values($placeholderForVariable)[0];
+
+        $this->assertCount(1, $placeholderForVariable);
+        $this->assertInternalType('string', $placeholder);
+        $this->assertContains($envVariableName, $placeholder);
+    }
+
+    public function testMergeWhereFirstBagIsEmptyWillWork()
+    {
+        $envVariableName = 'DB_HOST';
+        $parameter = sprintf('env(%s)', $envVariableName);
+        $firstBag = new EnvPlaceholderParameterBag();
+        $secondBag = new EnvPlaceholderParameterBag();
+
+        // initialize placeholder only in second bag
+        $secondBag->get($parameter);
+
+        $this->assertEmpty($firstBag->getEnvPlaceholders());
+
+        $firstBag->mergeEnvPlaceholders($secondBag);
+        $mergedPlaceholders = $firstBag->getEnvPlaceholders();
+
+        $placeholderForVariable = $mergedPlaceholders[$envVariableName];
+        $placeholder = array_values($placeholderForVariable)[0];
+
+        $this->assertCount(1, $placeholderForVariable);
+        $this->assertInternalType('string', $placeholder);
+        $this->assertContains($envVariableName, $placeholder);
+    }
+
+    public function testMergeWherePlaceholderOnlyExistsInSecond()
+    {
+        $uniqueEnvName = 'DB_HOST';
+        $commonEnvName = 'DB_USER';
+
+        $uniqueParamName = sprintf('env(%s)', $uniqueEnvName);
+        $commonParamName = sprintf('env(%s)', $commonEnvName);
+
+        $firstBag = new EnvPlaceholderParameterBag();
+        // initialize common placeholder
+        $firstBag->get($commonParamName);
+        $secondBag = clone $firstBag;
+
+        // initialize unique placeholder
+        $secondBag->get($uniqueParamName);
+
+        $firstBag->mergeEnvPlaceholders($secondBag);
+        $merged = $firstBag->getEnvPlaceholders();
+
+        $this->assertCount(1, $merged[$uniqueEnvName]);
+        // second bag has same placeholder for commonEnvName
+        $this->assertCount(1, $merged[$commonEnvName]);
+    }
+
+    public function testMergeWithDifferentIdentifiersForPlaceholders()
+    {
+        $envName = 'DB_USER';
+        $paramName = sprintf('env(%s)', $envName);
+
+        $firstBag = new EnvPlaceholderParameterBag();
+        $secondBag = new EnvPlaceholderParameterBag();
+        // initialize placeholders
+        $firstPlaceholder = $firstBag->get($paramName);
+        $secondPlaceholder = $secondBag->get($paramName);
+
+        $firstBag->mergeEnvPlaceholders($secondBag);
+        $merged = $firstBag->getEnvPlaceholders();
+
+        $this->assertNotEquals($firstPlaceholder, $secondPlaceholder);
+        $this->assertCount(2, $merged[$envName]);
+    }
+
+    public function testResolveEnvCastsIntToString()
+    {
+        $bag = new EnvPlaceholderParameterBag();
+        $bag->get('env(INT_VAR)');
+        $bag->set('env(Int_Var)', 2);
+        $bag->resolve();
+        $this->assertSame('2', $bag->all()['env(int_var)']);
+    }
+
+    public function testResolveEnvAllowsNull()
+    {
+        $bag = new EnvPlaceholderParameterBag();
+        $bag->get('env(NULL_VAR)');
+        $bag->set('env(Null_Var)', null);
+        $bag->resolve();
+        $this->assertNull($bag->all()['env(null_var)']);
+    }
+
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\RuntimeException
+     * @expectedExceptionMessage The default value of env parameter "ARRAY_VAR" must be scalar or null, array given.
+     */
+    public function testResolveThrowsOnBadDefaultValue()
+    {
+        $bag = new EnvPlaceholderParameterBag();
+        $bag->get('env(ARRAY_VAR)');
+        $bag->set('env(Array_Var)', array());
+        $bag->resolve();
+    }
+
+    public function testGetEnvAllowsNull()
+    {
+        $bag = new EnvPlaceholderParameterBag();
+        $bag->set('env(NULL_VAR)', null);
+        $bag->get('env(NULL_VAR)');
+        $bag->resolve();
+
+        $this->assertNull($bag->all()['env(null_var)']);
+    }
+
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\RuntimeException
+     * @expectedExceptionMessage The default value of an env() parameter must be scalar or null, but "array" given to "env(ARRAY_VAR)".
+     */
+    public function testGetThrowsOnBadDefaultValue()
+    {
+        $bag = new EnvPlaceholderParameterBag();
+        $bag->set('env(ARRAY_VAR)', array());
+        $bag->get('env(ARRAY_VAR)');
+        $bag->resolve();
+    }
+}