Ensure that select returns True after end of file.

This is because the next read will immediately return b''.

CHANGELOG.txt

@@ -1,3 +1,5 @@
+0.6.0: Ensure that select returns True after end of file.
+
 0.5.3: Fix TROVE classifiers
 
 0.5.2: Improve README file

non_blocking_io_wrapper/non_blocking_reader.py

@@ -82,12 +82,17 @@ def __del__(self):
         super().__del__()
 
     def select(self, timeout=None):
-        """Waits for data to become available.
+        """Waits for data to become available, or more exactly for the
+        next read not to return None. Specifically, it returns True after
+        end of file has been reached, because the next read will
+        immediately return b''.
 
         If timeout is given and is not None it is the maximum time in
         seconds to wait.
         Returns True if it succeeded or False on timeout.
         """
+        if self.ended:
+            return True
         self.available.wait(timeout)
         with self.lock:
             return 0 != len(self.data)

test/test_non_blocking_io_wrapper.py

@@ -67,3 +67,12 @@ def test_select_ok(self):
         end = time.time()
         self.assertEqual(b'a', self.fd.read())
         self.assertTrue(.05 < end-beg < .15)
+
+    def test_select_eof(self):
+        self.fd.drain()
+        self.assertEqual(b'ab\ncd', self.fd.read())
+        beg = time.time()
+        self.assertTrue(self.fd.select(.1))
+        end = time.time()
+        self.assertTrue(end-beg < .05)
+        self.assertEqual(b'', self.fd.read())