Comment 5 for bug 987490

The exceptions are different:

$ python3.1 -c 'open("/dev/null", "w").read()'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
IOError: not readable
$ python3.2 -c 'open("/dev/null", "w").read()'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
io.UnsupportedOperation: not readable

The following fix works, but maybe _UnsupportedOperation should be changed.

--- python/subunit/__init__.py
+++ python/subunit/__init__.py
@@ -1280,7 +1280,7 @@
             # Read streams
             if type(stream.read(0)) is str:
                 return stream.buffer
- except _UnsupportedOperation:
+ except (_UnsupportedOperation, IOError):
             # Cannot read from the stream: try via writes
             try:
                 stream.write(_b(''))

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