MQE-2669: Seprated a run:failed command to generate:failed and run:failed

 - add a simple unit test

Author: okolesnyk

dev/tests/unit/Magento/FunctionalTestFramework/Console/RunTestFailedCommandTest.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace tests\unit\Magento\FunctionalTestFramework\Console;
+
+use Magento\FunctionalTestingFramework\Console\RunTestFailedCommand;
+
+class RunTestFailedCommandTest extends BaseGenerateCommandTest
+{
+    /**
+     * @throws \ReflectionException
+     */
+    public function testMultipleTests(): void
+    {
+        $testFailedFile = [
+            "tests/functional/tests/MFTF/_generated/default/SingleTestNoSuiteTest.php:SingleTestNoSuiteTest",
+            "tests/functional/tests/MFTF/_generated/SomeSpecificSuite/FirstTestSuiteTest.php:SingleTestSuiteTest",
+            "tests/functional/tests/MFTF/_generated/SomeSpecificSuite/SecondTestNoSuiteTest.php:SingleTestNoSuiteTest",
+            "tests/functional/tests/MFTF/_generated/SomeOtherSuite/SecondTestNoSuiteTest.php:SingleTestNoSuiteTest",
+        ];
+
+        $expectedResult = [
+            "tests/functional/tests/MFTF/_generated/default/SingleTestNoSuiteTest.php",
+            "-g SomeSpecificSuite",
+            "-g SomeOtherSuite",
+        ];
+
+        $runFailed = new RunTestFailedCommand('run:failed');
+        $filter = $this->invokePrivateMethod($runFailed, 'filterTestsForExecution', [$testFailedFile]);
+        $this->assertEquals($expectedResult, $filter);
+    }
+
+    /**
+     * Invoking private method to be able to test it.
+     * NOTE: Bad practice don't repeat it.
+     *
+     * @param $object
+     * @param $methodName
+     * @param array $parameters
+     * @return mixed
+     * @throws \ReflectionException
+     */
+    private function invokePrivateMethod(&$object, $methodName, array $parameters = [])
+    {
+        $reflection = new \ReflectionClass(get_class($object));
+        $method = $reflection->getMethod($methodName);
+        $method->setAccessible(true);
+        return $method->invokeArgs($object, $parameters);
+    }
+}

src/Magento/FunctionalTestingFramework/Console/RunTestFailedCommand.php

@@ -23,7 +23,7 @@ class RunTestFailedCommand extends BaseGenerateCommand
     /**
      * @var string
      */
-    private $testsReRunFile = "";
+    private $testsReRunFile = "rerun_tests";
 
     /**
      * @var array