[Console] Added formatter style stack tests.

src/Symfony/Component/Console/Tests/Formatter/OutputFormatterStyleStackTest.php

@@ -0,0 +1,70 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Console\Tests\Formatter;
+
+use Symfony\Component\Console\Formatter\OutputFormatterStyleStack;
+use Symfony\Component\Console\Formatter\OutputFormatterStyle;
+
+class OutputFormatterStyleStackTest extends \PHPUnit_Framework_TestCase
+{
+    public function testPush()
+    {
+        $stack = new OutputFormatterStyleStack();
+        $stack->push($s1 = new OutputFormatterStyle('white', 'black'));
+        $stack->push($s2 = new OutputFormatterStyle('yellow', 'blue'));
+
+        $this->assertEquals($s2, $stack->getCurrent());
+
+        $stack->push($s3 = new OutputFormatterStyle('green', 'red'));
+
+        $this->assertEquals($s3, $stack->getCurrent());
+    }
+
+    public function testPop()
+    {
+        $stack = new OutputFormatterStyleStack();
+        $stack->push($s1 = new OutputFormatterStyle('white', 'black'));
+        $stack->push($s2 = new OutputFormatterStyle('yellow', 'blue'));
+
+        $this->assertEquals($s2, $stack->pop());
+        $this->assertEquals($s1, $stack->pop());
+    }
+
+    public function testPopEmpty()
+    {
+        $stack = new OutputFormatterStyleStack();
+        $style = new OutputFormatterStyle();
+
+        $this->assertEquals($style, $stack->pop());
+    }
+
+    public function testPopNotLast()
+    {
+        $stack = new OutputFormatterStyleStack();
+        $stack->push($s1 = new OutputFormatterStyle('white', 'black'));
+        $stack->push($s2 = new OutputFormatterStyle('yellow', 'blue'));
+        $stack->push($s3 = new OutputFormatterStyle('green', 'red'));
+
+        $this->assertEquals($s2, $stack->pop($s2));
+        $this->assertEquals($s1, $stack->pop());
+    }
+
+    /**
+     * @expectedException InvalidArgumentException
+     */
+    public function testInvalidPop()
+    {
+        $stack = new OutputFormatterStyleStack();
+        $stack->push(new OutputFormatterStyle('white', 'black'));
+        $stack->pop(new OutputFormatterStyle('yellow', 'blue'));
+    }
+}