Add encoding to ChannelFileWrite (#430)

* Add encoding to channel write files

Author: iamzayn19

news/430.feature.rst

@@ -0,0 +1 @@
+Added an ``encoding`` attribute to ``ChannelFileWrite``.

src/execnet/gateway_base.py

@@ -1079,6 +1079,8 @@ def __repr__(self) -> str:
 
 
 class ChannelFileWrite(ChannelFile):
+    encoding = "utf-8"
+
     def write(self, out: bytes) -> None:
         self.channel.send(out)
 

testing/test_channel.py

@@ -327,6 +327,7 @@ def test_channel_file_write_error(self, gw: Gateway) -> None:
         channel = gw.remote_exec("pass")
         f = channel.makefile()
         assert not f.isatty()
+        assert f.encoding == "utf-8"
         channel.waitclose(TESTTIMEOUT)
         with pytest.raises(IOError):
             f.write(b"hello")