diff --git a/src/Stream.php b/src/Stream.php
index 575ada3..f525aff 100644
--- a/src/Stream.php
+++ b/src/Stream.php
@@ -48,16 +48,6 @@ public function __construct($resource)
 		$this->resource = $resource;
 	}
 
-	/**
-	 * Checks if the stream is resourceable
-	 *
-	 * @return bool
-	 */
-	public function isResourceable() : bool
-	{
-		return \is_resource($this->resource);
-	}
-
 	/**
 	 * Detaches a resource from the stream
 	 *
@@ -83,7 +73,7 @@ public function detach()
 	 */
 	public function close() : void
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			return;
 		}
@@ -102,7 +92,7 @@ public function close() : void
 	 */
 	public function eof() : bool
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			return true;
 		}
@@ -121,7 +111,7 @@ public function eof() : bool
 	 */
 	public function tell() : int
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			throw new Exception\UntellableStreamException('Stream is not resourceable');
 		}
@@ -143,7 +133,7 @@ public function tell() : int
 	 */
 	public function isSeekable() : bool
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			return false;
 		}
@@ -164,7 +154,7 @@ public function isSeekable() : bool
 	 */
 	public function rewind() : void
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			throw new Exception\UnseekableStreamException('Stream is not resourceable');
 		}
@@ -196,7 +186,7 @@ public function rewind() : void
 	 */
 	public function seek($offset, $whence = \SEEK_SET) : void
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			throw new Exception\UnseekableStreamException('Stream is not resourceable');
 		}
@@ -221,7 +211,7 @@ public function seek($offset, $whence = \SEEK_SET) : void
 	 */
 	public function isWritable() : bool
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			return false;
 		}
@@ -246,7 +236,7 @@ public function isWritable() : bool
 	 */
 	public function write($string) : int
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			throw new Exception\UnwritableStreamException('Stream is not resourceable');
 		}
@@ -266,37 +256,6 @@ public function write($string) : int
 		return $result;
 	}
 
-	/**
-	 * Truncates the stream to the given length
-	 *
-	 * @param int $length
-	 *
-	 * @return void
-	 *
-	 * @throws Exception\UnwritableStreamException
-	 *
-	 * @link http://php.net/manual/en/function.ftruncate.php
-	 */
-	public function truncate(int $length = 0) : void
-	{
-		if (! $this->isResourceable())
-		{
-			throw new Exception\UnwritableStreamException('Stream is not resourceable');
-		}
-
-		if (! $this->isWritable())
-		{
-			throw new Exception\UnwritableStreamException('Stream is not writable');
-		}
-
-		$result = \ftruncate($this->resource, $length);
-
-		if (false === $result)
-		{
-			throw new Exception\UnwritableStreamException('Unable to truncate the stream');
-		}
-	}
-
 	/**
 	 * Checks if the stream is readable
 	 *
@@ -304,7 +263,7 @@ public function truncate(int $length = 0) : void
 	 */
 	public function isReadable() : bool
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			return false;
 		}
@@ -327,7 +286,7 @@ public function isReadable() : bool
 	 */
 	public function read($length) : string
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			throw new Exception\UnreadableStreamException('Stream is not resourceable');
 		}
@@ -358,7 +317,7 @@ public function read($length) : string
 	 */
 	public function getContents() : string
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			throw new Exception\UnreadableStreamException('Stream is not resourceable');
 		}
@@ -389,7 +348,7 @@ public function getContents() : string
 	 */
 	public function getMetadata($key = null)
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			return null;
 		}
@@ -415,7 +374,7 @@ public function getMetadata($key = null)
 	 */
 	public function getSize() : ?int
 	{
-		if (! $this->isResourceable())
+		if (! \is_resource($this->resource))
 		{
 			return null;
 		}
diff --git a/tests/StreamTest.php b/tests/StreamTest.php
index 0e67aa5..efc9e10 100644
--- a/tests/StreamTest.php
+++ b/tests/StreamTest.php
@@ -21,19 +21,7 @@ public function testConstructor()
 		$stream = new Stream($handle);
 
 		$this->assertInstanceOf(StreamInterface::class, $stream);
-
-		\fclose($handle);
-	}
-
-	public function testIsResourceable()
-	{
-		$handle = \fopen('php://memory', 'r+b');
-		$stream = new Stream($handle);
-
-		$this->assertTrue($stream->isResourceable());
-
-		$stream->detach();
-		$this->assertFalse($stream->isResourceable());
+		$this->assertStreamResourceEquals($stream, $handle);
 
 		\fclose($handle);
 	}
@@ -44,8 +32,7 @@ public function testDetach()
 		$stream = new Stream($handle);
 
 		$this->assertEquals($handle, $stream->detach());
-
-		$this->assertFalse($stream->isResourceable());
+		$this->assertStreamResourceEquals($stream, null);
 		$this->assertEquals(null, $stream->detach());
 
 		\fclose($handle);
@@ -57,6 +44,7 @@ public function testClose()
 		$stream = new Stream($handle);
 
 		$stream->close();
+		$this->assertStreamResourceEquals($stream, null);
 		$this->assertFalse(\is_resource($handle));
 
 		if (\is_resource($handle)) {
@@ -170,26 +158,6 @@ public function testWrite()
 		\fclose($handle);
 	}
 
-	public function testTruncate()
-	{
-		$string = 'Hello, world!';
-		$length = \strlen($string);
-
-		$handle = \fopen('php://memory', 'r+b');
-		$stream = new Stream($handle);
-
-		\fwrite($handle, $string);
-		$stream->truncate(4);
-		\rewind($handle);
-		$this->assertEquals(\substr($string, 0, 4), \fread($handle, $length));
-
-		$stream->truncate(0);
-		\rewind($handle);
-		$this->assertEquals('', \fread($handle, $length));
-
-		\fclose($handle);
-	}
-
 	public function testIsReadable()
 	{
 		$stream = new Stream(\STDIN);
@@ -347,18 +315,6 @@ public function testWriteUnresourceable()
 		$stream->write('0', 1);
 	}
 
-	public function testTruncateUnresourceable()
-	{
-		$this->expectException(UnwritableStreamException::class);
-		$this->expectExceptionMessage('Stream is not resourceable');
-
-		$handle = \fopen('php://memory', 'r+b');
-		$stream = new Stream($handle);
-
-		$stream->close();
-		$stream->truncate(0);
-	}
-
 	public function testReadUnresourceable()
 	{
 		$this->expectException(UnreadableStreamException::class);
@@ -392,15 +348,6 @@ public function testWriteUnwritable()
 		$stream->write('0', 1);
 	}
 
-	public function testTruncateUnwritable()
-	{
-		$this->expectException(UnwritableStreamException::class);
-		$this->expectExceptionMessage('Stream is not writable');
-
-		$stream = new Stream(\STDIN);
-		$stream->truncate(0);
-	}
-
 	public function testReadUnreadable()
 	{
 		$this->expectException(UnreadableStreamException::class);
@@ -463,4 +410,13 @@ public function testExceptions()
 		$this->assertInstanceOf(Exception::class, new UntellableStreamException(''));
 		$this->assertInstanceOf(Exception::class, new UnwritableStreamException(''));
 	}
+
+	private function assertStreamResourceEquals(StreamInterface $stream, $expected)
+	{
+		$property = new \ReflectionProperty($stream, 'resource');
+
+		$property->setAccessible(true);
+
+		return $this->assertEquals($property->getValue($stream), $expected);
+	}
 }