--- /dev/null
+<?php
+
+/*
+ * This file is part of the Behat Testwork.
+ * (c) Konstantin Kudryashov <ever.zet@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Behat\Testwork\Environment\Exception;
+
+use Behat\Testwork\Environment\Environment;
+use RuntimeException;
+
+/**
+ * Represents exception thrown during environment isolation process.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+final class EnvironmentIsolationException extends RuntimeException implements EnvironmentException
+{
+ /**
+ * @var Environment
+ */
+ private $environment;
+ /**
+ * @var mixed
+ */
+ private $subject;
+
+ /**
+ * Initializes exception.
+ *
+ * @param string $message
+ * @param Environment $environment
+ * @param mixed $testSubject
+ */
+ public function __construct($message, Environment $environment, $testSubject = null)
+ {
+ $this->environment = $environment;
+ $this->subject = $testSubject;
+
+ parent::__construct($message);
+ }
+
+ /**
+ * Returns environment that caused exception.
+ *
+ * @return Environment
+ */
+ public function getEnvironment()
+ {
+ return $this->environment;
+ }
+
+ /**
+ * Returns test subject that caused exception.
+ *
+ * @return mixed
+ */
+ public function getSubject()
+ {
+ return $this->subject;
+ }
+}