check that the stream raises no error other than EOF when it's supposed to be at EOF

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54592 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/streams/bstream.h

@@ -135,6 +135,9 @@ protected:
         // Travel to the end of the stream.
         while(!stream_in.Eof())
         {
+            CPPUNIT_ASSERT_MESSAGE( "unexpected non-EOF stream error",
+                                    stream_in.IsOk() );
+
             // Read, we move one byte along.
             (void)stream_in.GetC();
 #if 0