[Console] Mention Terminal color mode support

Author: alexandre-daubois

console.rst

@@ -574,6 +574,38 @@ call ``setAutoExit(false)`` on it to get the command result in ``CommandTester``
     :class:`Symfony\\Component\\Console\\Application`
     and extend the normal ``\PHPUnit\Framework\TestCase``.
 
+
+When testing your commands, it could be useful to understand how your command
+reacts on different settings like the width and the height of the terminal, or
+even the color mode being used.
+Thanks to the :class:`Symfony\\Component\\Console\\Terminal` class, you can
+have access to such information::
+
+    use Symfony\Component\Console\Terminal;
+    use Symfony\Component\Console\Output\AnsiColorMode;
+
+    $terminal = new Terminal();
+
+    // access to number of lines available
+    $height = $terminal->getHeight();
+
+    // access to number of columns available
+    $width = $terminal->getWidth();
+
+    // access to the color mode
+    $colorMode = $terminal->getColorMode();
+
+    // set the color mode to use
+    $colorMode = $terminal->setColorMode(AnsiColorMode::Ansi24);
+
+By default, the ``Terminal`` class uses the values of the
+``LINES`` and ``COLUMNS`` system environment variables.
+
+.. versionadded:: 6.2
+
+    The support for setting and getting the current color mode was introduced
+    in Symfony 6.2.
+
 Logging Command Errors
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