diff --git a/src/TarStreamer.php b/src/TarStreamer.php
index 4c73f65..7d167cb 100644
--- a/src/TarStreamer.php
+++ b/src/TarStreamer.php
@@ -38,24 +38,16 @@ public function __construct($options = []){
 	 *
 	 * @param string $archiveName Filename of archive to be created (optional, default 'archive.tar')
 	 * @param string $contentType Content mime type to be set (optional, default 'application/x-tar')
+	 * @throws \Exception
 	 */
 	public function sendHeaders($archiveName = 'archive.tar', $contentType = 'application/x-tar'){
 		$encodedArchiveName = rawurlencode($archiveName);
 		if (headers_sent($headerFile, $headerLine)){
-			die(
-					"<p><strong>Error:</strong> Unable to send file " .
-					"$encodedArchiveName. HTML Headers have already been sent from " .
-					"<strong>$headerFile</strong> in line <strong>$headerLine" .
-					"</strong></p>"
-			);
+			throw new \Exception("Unable to send file $encodedArchiveName. HTML Headers have already been sent from $headerFile in line $headerLine");
 		}
 		$buffer = ob_get_contents();
 		if (!empty($buffer)){
-			die(
-					"\n<p><strong>Error:</strong> Unable to send file " .
-					"<strong>$encodedArchiveName</strong>. Output buffer " .
-					"already contains text (typically warnings or errors).</p>"
-			);
+			throw new \Exception("Unable to send file $encodedArchiveName. Output buffer already contains text (typically warnings or errors).");
 		}
 
 		$headers = [
diff --git a/tests/Streamer.php b/tests/Streamer.php
index 3c3cbd0..caea3aa 100644
--- a/tests/Streamer.php
+++ b/tests/Streamer.php
@@ -14,8 +14,9 @@ class Streamer extends PHPUnit_Framework_TestCase
 	/** @var TarStreamer */
 	private $streamer;
 
-	public function setUp() {
-		$this->archive = tempnam('/tmp' , 'tar');
+	public function setUp()
+	{
+		$this->archive = tempnam('/tmp', 'tar');
 		$this->streamer = new TarStreamer(
 			['outstream' => fopen($this->archive, 'w')]
 		);
@@ -26,25 +27,83 @@ public function setUp() {
 	 * @param $fileName
 	 * @param $data
 	 */
-	public function testSimpleFile($fileName, $data) {
-		$dataStream = fopen('data://text/plain,'.$data, 'r');
-		$this->streamer->addFileFromStream($dataStream, $fileName, 10);
+	public function testSimpleFile($fileName, $data)
+	{
+		$dataStream = fopen('data://text/plain,' . $data, 'r');
+		$ret = $this->streamer->addFileFromStream($dataStream, $fileName, 10);
+		$this->assertTrue($ret);
+
 		$this->streamer->finalize();
 
-		$this->assertTar($fileName, $data);
+		$this->assertFileInTar($fileName);
 	}
 
-	public function providesNameAndData() {
+	/**
+	 * @dataProvider providesNameAndData
+	 * @param $fileName
+	 * @param $data
+	 */
+	public function testAddingNoResource($fileName, $data)
+	{
+		$ret = $this->streamer->addFileFromStream($data, $fileName, 10);
+		$this->assertFalse($ret);
+
+		$this->streamer->finalize();
+
+		$this->assertFileNotInTar($fileName);
+	}
+
+	public function testDir()
+	{
+		$folderName = 'foo-folder';
+		$this->streamer->addEmptyDir($folderName);
+
+		$this->streamer->finalize();
+
+		$this->assertFolderInTar($folderName);
+	}
+
+	public function providesNameAndData()
+	{
 		return [
 			['foo.bar', '1234567890'],
 //			['foobar1234foobar1234foobar1234foobar1234foobar1234foobar1234foobar1234foobar1234foobar1234foobar1234.txt', 'abcdefgh']
 		];
 	}
 
-	private function assertTar($file, $data)
+	private function assertFileInTar($file)
+	{
+		$elem = $this->getElementFromTar($file);
+		$this->assertNotNull($elem);
+		$this->assertEquals('0', $elem['typeflag']);
+	}
+
+	private function assertFileNotInTar($file)
 	{
 		$arc = new Archive_Tar($this->archive);
 		$content = $arc->extractInString($file);
-		$this->assertEquals($data, $content);
+		$this->assertNull($content);
+	}
+
+	private function assertFolderInTar($folderName)
+	{
+		$elem = $this->getElementFromTar($folderName . '/');
+		$this->assertNotNull($elem);
+		$this->assertEquals('5', $elem['typeflag']);
+	}
+
+	/**
+	 * @param $folderName
+	 * @param $list
+	 * @return array
+	 */
+	private function getElementFromTar($folderName)
+	{
+		$arc = new Archive_Tar($this->archive);
+		$list = $arc->listContent();
+		$elem = array_filter($list, function ($element) use ($folderName) {
+			return $element['filename'] == $folderName;
+		});
+		return isset($elem[0]) ? $elem[0] : null;
 	}
 }