1 files changed, 17 insertions, 4 deletions
diff --git a/luni/src/test/java/libcore/java/io/FileDescriptorTest.java b/luni/src/test/java/libcore/java/io/FileDescriptorTest.java
index 4315b81..39472df 100644
--- a/luni/src/test/java/libcore/java/io/FileDescriptorTest.java
+++ b/luni/src/test/java/libcore/java/io/FileDescriptorTest.java
@@ -17,14 +17,27 @@
 package libcore.java.io;
 
 import java.io.File;
+import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.RandomAccessFile;
+import java.net.ServerSocket;
 import junit.framework.TestCase;
 
 public class FileDescriptorTest extends TestCase {
-    public void testReadOnlyFileDescriptorSync() throws Exception {
-        File f= File.createTempFile("FileDescriptorTest", "tmp");
-        new RandomAccessFile(f, "r").getFD().sync();
-    }
+  public void testReadOnlyFileDescriptorSync() throws Exception {
+    File f= File.createTempFile("FileDescriptorTest", "tmp");
+    new RandomAccessFile(f, "r").getFD().sync();
+  }
+
+  public void test_isSocket() throws Exception {
+    File f = new File("/dev/null");
+    FileInputStream fis = new FileInputStream(f);
+    assertFalse(fis.getFD().isSocket());
+    fis.close();
+
+    ServerSocket s = new ServerSocket();
+    assertTrue(s.getImpl$().getFD$().isSocket());
+    s.close();
+  }
 }