--- test_fileinput.py.orig	2015-11-01 22:47:30.193112793 +0900
+++ test_fileinput.py	2015-11-01 22:54:39.461124614 +0900
@@ -289,6 +289,19 @@
                 # Read to the end of file.
                 list(fi)
 
+    def test_readline_binary_mode(self):
+        with open(TESTFN, 'wb') as f:
+            f.write(b'A\nB\r\nC\r')
+        self.addCleanup(safe_unlink, TESTFN)
+
+        with FileInput(files=TESTFN, mode='rb') as fi:
+            self.assertEqual(fi.readline(), b'A\n')
+            self.assertEqual(fi.readline(), b'B\r\n')
+            self.assertEqual(fi.readline(), b'C\r')
+            # Read to the end of file.
+            self.assertEqual(fi.readline(), b'')
+            self.assertEqual(fi.readline(), b'')
+
     def test_context_manager(self):
         try:
             t1 = writeTmp(1, ["A\nB\nC"])