symfony
diff --git a/‎src/Symfony/Component/Console/Style/OutputStyle.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Console/Style/OutputStyle.php
+11Lines changed: 11 additions & 0 deletions b/‎src/Symfony/Component/Console/Style/OutputStyle.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Console/Style/OutputStyle.php
+11Lines changed: 11 additions & 0 deletions
diff --git a/‎src/Symfony/Component/Console/Style/SymfonyStyle.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Console/Style/SymfonyStyle.php
+13Lines changed: 13 additions & 0 deletions b/‎src/Symfony/Component/Console/Style/SymfonyStyle.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Console/Style/SymfonyStyle.php
+13Lines changed: 13 additions & 0 deletions
diff --git a/‎src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php
+41Lines changed: 41 additions & 0 deletions b/‎src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Console/Tests/Style/SymfonyStyleTest.php
+41Lines changed: 41 additions & 0 deletions
@@ -14,6 +14,8 @@
 use Symfony\Component\Console\Formatter\OutputFormatterInterface;
 use Symfony\Component\Console\Helper\ProgressBar;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Exception\LogicException;
 
 /**
  * Decorates output to add console style guide helpers.
@@ -145,4 +147,13 @@ public function isDebug()
     {
         return $this->output->isDebug();
     }
+
+    protected function getErrorOutput()
+    {
+        if (!$this->output instanceof ConsoleOutputInterface) {
+            throw new LogicException(sprintf('The output must be an instance of %s for using getErrorOutput().', ConsoleOutputInterface::class));
+        }
+
+        return $this->output->getErrorOutput();
+    }
 }
@@ -11,6 +11,7 @@
 
 namespace Symfony\Component\Console\Style;
 
+use Symfony\Component\Console\Exception\LogicException;
 use Symfony\Component\Console\Exception\RuntimeException;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Helper\Helper;
@@ -337,6 +338,18 @@ public function newLine($count = 1)
         $this->bufferedOutput->write(str_repeat("\n", $count));
     }
 
+    /**
+     * Returns a new instance which makes use of stderr.
+     *
+     * @return self
+     *
+     * @throws LogicException If stderr is not accessible
+     */
+    public function getErrorStyle()
+    {
+        return new self($this->input, $this->getErrorOutput());
+    }
+
     /**
      * @return ProgressBar
      */
 
@@ -14,6 +14,13 @@
 use PHPUnit_Framework_TestCase;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Tester\CommandTester;
+use Symfony\Component\Console\Formatter\OutputFormatter;
+use Symfony\Component\Console\Output\NullOutput;
+use Symfony\Component\Console\Output\StreamOutput;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Output\ConsoleOutputInterface;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
 
 class SymfonyStyleTest extends PHPUnit_Framework_TestCase
 {
@@ -70,4 +77,38 @@ public function inputCommandToOutputFilesProvider()
 
         return array_map(null, glob($baseDir.'/command/command_*.php'), glob($baseDir.'/output/output_*.txt'));
     }
+
+    public function testGetErrorStyle()
+    {
+        $input = $this->getMockBuilder(InputInterface::class)->getMock();
+
+        $errorOutput = $this->getMockBuilder(OutputInterface::class)->getMock();
+        $errorOutput
+            ->method('getFormatter')
+            ->willReturn(new OutputFormatter());
+        $errorOutput
+            ->expects($this->once())
+            ->method('write');
+
+        $output = $this->getMockBuilder(ConsoleOutputInterface::class)->getMock();
+        $output
+            ->method('getFormatter')
+            ->willReturn(new OutputFormatter());
+        $output
+            ->expects($this->once())
+            ->method('getErrorOutput')
+            ->willReturn($errorOutput);
+
+        $io = new SymfonyStyle($input, $output);
+        $io->getErrorStyle()->write('');
+    }
+
+    /**
+     * @expectedException Symfony\Component\Console\Exception\LogicException
+     * @expectedExceptionMessage The output must be an instance of Symfony\Component\Console\Output\ConsoleOutputInterface for using getErrorOutput().
+     */
+    public function testGetErrorStyleThrowsExceptionOnInvalidOutput()
+    {
+        (new SymfonyStyle($this->getMockBuilder(InputInterface::class)->getMock(), new NullOutput()))->getErrorStyle();
+    }
 }