diff --git a/tests/unit/framework/helpers/FileHelperTest.php b/tests/unit/framework/helpers/FileHelperTest.php
new file mode 100644
index 0000000..89a5a02
--- /dev/null
+++ b/tests/unit/framework/helpers/FileHelperTest.php
@@ -0,0 +1,71 @@
+<?php
+
+use yii\helpers\base\FileHelper;
+use yii\test\TestCase;
+
+/**
+ * Unit test for [[yii\helpers\base\FileHelper]]
+ * @see FileHelper
+ */
+class FileHelperTest extends TestCase
+{
+	private $testFilePath = '';
+
+	public function setUp()
+	{
+		$this->testFilePath = Yii::getAlias('@yiiunit/runtime') . DIRECTORY_SEPARATOR . get_class($this);
+		$this->createDir($this->testFilePath);
+	}
+
+	public function tearDown()
+	{
+		$this->removeDir($this->testFilePath);
+	}
+
+	/**
+	 * Creates directory.
+	 * @param string $dirName directory full name.
+	 */
+	protected function createDir($dirName)
+	{
+		if (!file_exists($dirName)) {
+			mkdir($dirName, 0777, true);
+		}
+	}
+
+	/**
+	 * Removes directory.
+	 * @param string $dirName directory full name.
+	 */
+	protected function removeDir($dirName)
+	{
+		if (!empty($dirName) && file_exists($dirName)) {
+			exec("rm -rf {$dirName}");
+		}
+	}
+
+	// Tests :
+
+	public function testCopyDirectory() {
+		$basePath = $this->testFilePath;
+		$srcDirName = $basePath . DIRECTORY_SEPARATOR . 'test_src_dir';
+		mkdir($srcDirName, 0777, true);
+		$files = array(
+			'file1.txt' => 'file 1 content',
+			'file2.txt' => 'file 2 content',
+		);
+		foreach ($files as $name => $content) {
+			file_put_contents($srcDirName . DIRECTORY_SEPARATOR . $name, $content);
+		}
+		$dstDirName = $basePath . DIRECTORY_SEPARATOR . 'test_dst_dir';
+
+		FileHelper::copyDirectory($srcDirName, $dstDirName);
+
+		$this->assertTrue(file_exists($dstDirName), 'Destination directory does not exist!');
+		foreach ($files as $name => $content) {
+			$fileName = $dstDirName . DIRECTORY_SEPARATOR . $name;
+			$this->assertTrue(file_exists($fileName), 'Directory file is missing!');
+			$this->assertEquals($content, file_get_contents($fileName), 'Incorrect file content!');
+		}
+	}
+}
\ No newline at end of file