diff --git a/classes/streams/PlaylistArchiveStream.php b/classes/streams/PlaylistArchiveStream.php
index 4dc5e8d..7173c0b 100644
--- a/classes/streams/PlaylistArchiveStream.php
+++ b/classes/streams/PlaylistArchiveStream.php
@@ -191,6 +191,8 @@ class PlaylistArchiveStream extends ZipArchive implements StreamInterface
      */
     public function __toString()
     {
+        $this->rewind();
+
         return $this->getContents();
     }
 
diff --git a/tests/ControllerTest.php b/tests/ControllerTest.php
index bad16a5..d4a94f9 100644
--- a/tests/ControllerTest.php
+++ b/tests/ControllerTest.php
@@ -5,7 +5,6 @@
 
 namespace Alltube\Test;
 
-use Alltube\Controller\BaseController;
 use Alltube\Controller\DownloadController;
 use Alltube\Controller\FrontController;
 use Alltube\LocaleManager;
@@ -43,8 +42,6 @@ abstract class ControllerTest extends BaseTest
 
     /**
      * Controller instance used in tests.
-     *
-     * @var BaseController
      */
     protected $controller;
 
diff --git a/tests/ConvertedPlaylistArchiveStreamTest.php b/tests/ConvertedPlaylistArchiveStreamTest.php
new file mode 100644
index 0000000..48a7d9e
--- /dev/null
+++ b/tests/ConvertedPlaylistArchiveStreamTest.php
@@ -0,0 +1,27 @@
+<?php
+/**
+ * ConvertedPlaylistArchiveStreamTest class.
+ */
+
+namespace Alltube\Test;
+
+use Alltube\Stream\ConvertedPlaylistArchiveStream;
+use Alltube\Video;
+
+/**
+ * Unit tests for the ConvertedPlaylistArchiveStream class.
+ */
+class ConvertedPlaylistArchiveStreamTest extends StreamTest
+{
+    /**
+     * Prepare tests.
+     */
+    protected function setUp()
+    {
+        parent::setUp();
+
+        $video = new Video('https://www.youtube.com/playlist?list=PL1j4Ff8cAqPu5iowaeUAY8lRgkfT4RybJ');
+
+        $this->stream = new ConvertedPlaylistArchiveStream($video);
+    }
+}
diff --git a/tests/FrontControllerTest.php b/tests/FrontControllerTest.php
index 2c95290..1dabf40 100644
--- a/tests/FrontControllerTest.php
+++ b/tests/FrontControllerTest.php
@@ -16,13 +16,6 @@ use Slim\Http\Request;
  */
 class FrontControllerTest extends ControllerTest
 {
-    /**
-     * Controller instance used in tests.
-     *
-     * @var FrontController
-     */
-    protected $controller;
-
     /**
      * Prepare tests.
      */
diff --git a/tests/PlaylistArchiveStreamTest.php b/tests/PlaylistArchiveStreamTest.php
index 6d1eb6d..dfb2af7 100644
--- a/tests/PlaylistArchiveStreamTest.php
+++ b/tests/PlaylistArchiveStreamTest.php
@@ -9,17 +9,10 @@ use Alltube\Stream\PlaylistArchiveStream;
 use Alltube\Video;
 
 /**
- * Unit tests for the ViewFactory class.
+ * Unit tests for the PlaylistArchiveStream class.
  */
-class PlaylistArchiveStreamTest extends BaseTest
+class PlaylistArchiveStreamTest extends StreamTest
 {
-    /**
-     * PlaylistArchiveStream instance.
-     *
-     * @var PlaylistArchiveStream
-     */
-    private $stream;
-
     /**
      * Prepare tests.
      */
@@ -31,160 +24,4 @@ class PlaylistArchiveStreamTest extends BaseTest
 
         $this->stream = new PlaylistArchiveStream($video);
     }
-
-    /**
-     * Clean variables used in tests.
-     *
-     * @return void
-     */
-    protected function tearDown()
-    {
-        $this->stream->close();
-    }
-
-    /**
-     * Test the write() function.
-     *
-     * @return void
-     */
-    public function testWrite()
-    {
-        $this->assertNull($this->stream->write('foo'));
-    }
-
-    /**
-     * Test the tell() function.
-     *
-     * @return void
-     */
-    public function testTell()
-    {
-        $this->assertInternalType('int', $this->stream->tell());
-    }
-
-    /**
-     * Test the seek() function.
-     *
-     * @return void
-     */
-    public function testSeek()
-    {
-        $this->stream->write('foobar');
-        $this->stream->seek(3);
-        $this->assertEquals(3, $this->stream->tell());
-    }
-
-    /**
-     * Test the read() function.
-     *
-     * @return void
-     */
-    public function testRead()
-    {
-        $result = $this->stream->read(8192);
-        $this->assertInternalType('string', $result);
-        $this->assertLessThanOrEqual(8192, strlen($result));
-    }
-
-    /**
-     * Test the eof() function.
-     *
-     * @return void
-     */
-    public function testEof()
-    {
-        $this->assertFalse($this->stream->eof());
-    }
-
-    /**
-     * Test the getSize() function.
-     *
-     * @return void
-     */
-    public function testGetSize()
-    {
-        $this->assertNull($this->stream->getSize());
-    }
-
-    /**
-     * Test the isSeekable() function.
-     *
-     * @return void
-     */
-    public function testIsSeekable()
-    {
-        $this->assertTrue($this->stream->isSeekable());
-    }
-
-    /**
-     * Test the rewind() function.
-     *
-     * @return void
-     */
-    public function testRewind()
-    {
-        $this->stream->rewind();
-        $this->assertEquals(0, $this->stream->tell());
-    }
-
-    /**
-     * Test the isWritable() function.
-     *
-     * @return void
-     */
-    public function testIsWritable()
-    {
-        $this->assertTrue($this->stream->isWritable());
-    }
-
-    /**
-     * Test the isReadable() function.
-     *
-     * @return void
-     */
-    public function testIsReadable()
-    {
-        $this->assertTrue($this->stream->isReadable());
-    }
-
-    /**
-     * Test the getContents() function.
-     *
-     * @return void
-     */
-    public function testGetContents()
-    {
-        $this->assertInternalType('string', $this->stream->getContents());
-    }
-
-    /**
-     * Test the getMetadata() function.
-     *
-     * @return void
-     */
-    public function testGetMetadata()
-    {
-        $this->assertInternalType('array', $this->stream->getMetadata());
-    }
-
-    /**
-     * Test the detach() function.
-     *
-     * @return void
-     */
-    public function testDetach()
-    {
-        $this->assertInternalType('resource', $this->stream->detach());
-    }
-
-    /**
-     * Test the __toString() function.
-     *
-     * @return void
-     */
-    public function testToString()
-    {
-        $this->assertInternalType('string', $this->stream->__toString());
-        $this->assertInternalType('string', (string) $this->stream);
-    }
 }
diff --git a/tests/StreamTest.php b/tests/StreamTest.php
new file mode 100644
index 0000000..d74af82
--- /dev/null
+++ b/tests/StreamTest.php
@@ -0,0 +1,222 @@
+<?php
+/**
+ * StreamTest class.
+ */
+
+namespace Alltube\Test;
+
+use RuntimeException;
+
+/**
+ * Abstract class used by the stream tests.
+ */
+abstract class StreamTest extends BaseTest
+{
+    /**
+     * Stream instance.
+     */
+    protected $stream;
+
+    /**
+     * Clean variables used in tests.
+     *
+     * @return void
+     */
+    protected function tearDown()
+    {
+        $this->stream->close();
+    }
+
+    /**
+     * Test the write() function.
+     *
+     * @return void
+     */
+    public function testWrite()
+    {
+        if ($this->stream->isWritable()) {
+            $this->assertNull($this->stream->write('foo'));
+        } else {
+            $this->expectException(RuntimeException::class);
+            $this->stream->write('foo');
+        }
+    }
+
+    /**
+     * Test the tell() function.
+     *
+     * @return void
+     */
+    public function testTell()
+    {
+        $this->assertInternalType('int', $this->stream->tell());
+    }
+
+    /**
+     * Test the seek() function.
+     *
+     * @return void
+     */
+    public function testSeek()
+    {
+        if ($this->stream->isSeekable()) {
+            if ($this->stream->isWritable()) {
+                // We might need some data.
+                $this->stream->write('foobar');
+            }
+
+            $this->stream->seek(3);
+            $this->assertEquals(3, $this->stream->tell());
+        } else {
+            $this->expectException(RuntimeException::class);
+            $this->stream->seek(3);
+        }
+    }
+
+    /**
+     * Test the read() function.
+     *
+     * @return void
+     */
+    public function testRead()
+    {
+        $result = $this->stream->read(8192);
+        $this->assertInternalType('string', $result);
+        $this->assertLessThanOrEqual(8192, strlen($result));
+    }
+
+    /**
+     * Test the read() function.
+     *
+     * @return void
+     */
+    public function testReadEntireStream()
+    {
+        $this->markTestIncomplete('Can we test the whole logic without reading the whole stream?');
+    }
+
+    /**
+     * Test the eof() function.
+     *
+     * @return void
+     */
+    public function testEof()
+    {
+        $this->assertFalse($this->stream->eof());
+    }
+
+    /**
+     * Test the getSize() function.
+     *
+     * @return void
+     */
+    public function testGetSize()
+    {
+        $this->assertNull($this->stream->getSize());
+    }
+
+    /**
+     * Test the isSeekable() function.
+     *
+     * @return void
+     */
+    public function testIsSeekable()
+    {
+        $this->assertInternalType('boolean', $this->stream->isSeekable());
+    }
+
+    /**
+     * Test the rewind() function.
+     *
+     * @return void
+     */
+    public function testRewind()
+    {
+        if ($this->stream->isSeekable()) {
+            if ($this->stream->isWritable()) {
+                // We might need some data.
+                $this->stream->write('foobar');
+            }
+
+            $this->stream->rewind();
+            $this->assertEquals(0, $this->stream->tell());
+        } else {
+            $this->expectException(RuntimeException::class);
+            $this->stream->rewind();
+        }
+    }
+
+    /**
+     * Test the isWritable() function.
+     *
+     * @return void
+     */
+    public function testIsWritable()
+    {
+        $this->assertInternalType('boolean', $this->stream->isWritable());
+    }
+
+    /**
+     * Test the isReadable() function.
+     *
+     * @return void
+     */
+    public function testIsReadable()
+    {
+        $this->assertTrue($this->stream->isReadable());
+    }
+
+    /**
+     * Test the getContents() function.
+     *
+     * @return void
+     */
+    public function testGetContents()
+    {
+        $this->assertInternalType('string', $this->stream->getContents());
+    }
+
+    /**
+     * Test the getMetadata() function.
+     *
+     * @return void
+     */
+    public function testGetMetadata()
+    {
+        $this->assertInternalType('array', $this->stream->getMetadata());
+    }
+
+    /**
+     * Test the getMetadata() function.
+     *
+     * @return void
+     */
+    public function testGetMetadataWithKey()
+    {
+        $this->assertInternalType('string', $this->stream->getMetadata('stream_type'));
+        $this->assertInternalType('string', $this->stream->getMetadata('mode'));
+        $this->assertInternalType('boolean', $this->stream->getMetadata('seekable'));
+        $this->assertNull($this->stream->getMetadata('foo'));
+    }
+
+    /**
+     * Test the detach() function.
+     *
+     * @return void
+     */
+    public function testDetach()
+    {
+        $this->assertInternalType('resource', $this->stream->detach());
+    }
+
+    /**
+     * Test the __toString() function.
+     *
+     * @return void
+     */
+    public function testToString()
+    {
+        $this->assertInternalType('string', $this->stream->__toString());
+        $this->assertInternalType('string', (string) $this->stream);
+    }
+}
diff --git a/tests/YoutubeChunkStreamTest.php b/tests/YoutubeChunkStreamTest.php
new file mode 100644
index 0000000..e386bd2
--- /dev/null
+++ b/tests/YoutubeChunkStreamTest.php
@@ -0,0 +1,27 @@
+<?php
+/**
+ * YoutubeChunkStreamTest class.
+ */
+
+namespace Alltube\Test;
+
+use Alltube\Stream\YoutubeChunkStream;
+use Alltube\Video;
+
+/**
+ * Unit tests for the YoutubeChunkStream class.
+ */
+class YoutubeChunkStreamTest extends StreamTest
+{
+    /**
+     * Prepare tests.
+     */
+    protected function setUp()
+    {
+        parent::setUp();
+
+        $video = new Video('https://www.youtube.com/watch?v=dQw4w9WgXcQ');
+
+        $this->stream = new YoutubeChunkStream($video->getHttpResponse());
+    }
+}
diff --git a/tests/YoutubeStreamTest.php b/tests/YoutubeStreamTest.php
new file mode 100644
index 0000000..3907389
--- /dev/null
+++ b/tests/YoutubeStreamTest.php
@@ -0,0 +1,27 @@
+<?php
+/**
+ * YoutubeStreamTest class.
+ */
+
+namespace Alltube\Test;
+
+use Alltube\Stream\YoutubeStream;
+use Alltube\Video;
+
+/**
+ * Unit tests for the YoutubeStream class.
+ */
+class YoutubeStreamTest extends StreamTest
+{
+    /**
+     * Prepare tests.
+     */
+    protected function setUp()
+    {
+        parent::setUp();
+
+        $video = new Video('https://www.youtube.com/watch?v=dQw4w9WgXcQ', '135');
+
+        $this->stream = new YoutubeStream($video);
+    }
+}