Cover use of `file_get_contents` with a directory

src/Stream/FileHandle.php

@@ -78,6 +78,8 @@ class FileHandle extends AbstractHandle
     {
         if (!$this->node) {
             throw new UnopenedHandleException($this, $this->url);
+        } elseif (!$this->node instanceof FileInterface) {
+            return '';
         }
 
         if (null !== $length) {

test/acceptance/Stream/StreamWrapper/FileGetContentsAcceptanceTest.php

@@ -11,6 +11,11 @@ class FileGetContentsAcceptanceTest extends AcceptanceTestCase
         ]
     ];
 
+    public function testGetDirectory()
+    {
+        $this->assertEquals('', file_get_contents("$this->scheme://foo"));
+    }
+
     public function testGetFile()
     {
         $this->assertEquals($this->tree['foo']['bar'], file_get_contents("$this->scheme://foo/bar"));

test/unit/Stream/FileHandleTest.php

@@ -219,6 +219,18 @@ class FileHandleTest extends UnitTestCase
         $this->assertEquals($expected, $handle->read($offset, $length));
     }
 
+    public function testReadNonFile()
+    {
+        $handle = new FileHandle($this->fs, 'foo://bar');
+
+        $file = Mockery::mock('Vfs\Node\NodeInterface');
+
+        $this->fs->shouldReceive('get')->once()->with('/bar')->andReturn($file);
+
+        $handle->open();
+        $this->assertEquals('', $handle->read(0, PHP_INT_MAX));
+    }
+
     public function testReadThrowsWithoutOpening()
     {
         $handle = new FileHandle($this->fs, 'foo://bar');