#63: Implement fileno(), so the StandardOutputReplication() could mor…

…e realistic look

rkd/api/inputoutput.py

@@ -43,9 +43,11 @@
 
 class StandardOutputReplication(object):
     _out_streams: list
+    _fileno: int
 
-    def __init__(self, out_streams: list):
+    def __init__(self, out_streams: list, fileno: int = None):
         self._out_streams = out_streams
+        self._fileno = fileno
 
     def write(self, buf):
         for stream in self._out_streams:
@@ -60,7 +62,7 @@ def write(self, buf):
         self.flush()
 
     def fileno(self):
-        return 1
+        return self._fileno
 
     def flush(self):
         pass
@@ -113,8 +115,8 @@ def capture_descriptors(self, target_files: List[str] = None, stream=None, enabl
             outputs_stderr.append(stream)
 
         # 4. Mock
-        sys.stdout = StandardOutputReplication(outputs_stdout)
-        sys.stderr = StandardOutputReplication(outputs_stderr)
+        sys.stdout = StandardOutputReplication(outputs_stdout, sys.stdout.fileno())
+        sys.stderr = StandardOutputReplication(outputs_stderr, sys.stderr.fileno())
 
         # 5. Action!
         yield

test/test_inputoutput_standardoutputreplication.py

@@ -14,7 +14,7 @@ def test_writing_to_multiple_streams_of_different_types(self):
         bytes_io = BytesIO()
         str_io = StringIO()
 
-        out = StandardOutputReplication([bytes_io, str_io])
+        out = StandardOutputReplication([bytes_io, str_io], 1)
         out.write('12 June 1963 Medgar Wiley Evers, African American civil rights activist from Mississippi')
         out.write(' was shot in the back and killed by a member of the White Citizens\' Council.')
 
@@ -28,7 +28,7 @@ def test_non_printable_is_converted_to_string_like_print_does(self):
 
         str_io = StringIO()
 
-        out = StandardOutputReplication([str_io])
+        out = StandardOutputReplication([str_io], 1)
         out.write(unittest)
 
         self.assertIn("<module 'unittest'", str_io.getvalue())