--- /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\Tester;
+
+use Behat\Testwork\Specification\SpecificationIterator;
+use Behat\Testwork\Tester\Result\TestResult;
+use Behat\Testwork\Tester\Setup\Setup;
+use Behat\Testwork\Tester\Setup\Teardown;
+
+/**
+ * Prepares and tests provided exercise specifications.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+interface Exercise
+{
+ /**
+ * Sets up exercise for a test.
+ *
+ * @param SpecificationIterator[] $iterators
+ * @param Boolean $skip
+ *
+ * @return Setup
+ */
+ public function setUp(array $iterators, $skip);
+
+ /**
+ * Tests suites specifications.
+ *
+ * @param SpecificationIterator[] $iterators
+ * @param Boolean $skip
+ *
+ * @return TestResult
+ */
+ public function test(array $iterators, $skip);
+
+ /**
+ * Tears down exercise after a test.
+ *
+ * @param SpecificationIterator[] $iterators
+ * @param Boolean $skip
+ * @param TestResult $result
+ *
+ * @return Teardown
+ */
+ public function tearDown(array $iterators, $skip, TestResult $result);
+}