errors: decode bytes (#412)

Author: blueyed

pynvim/api/nvim.py

@@ -76,7 +76,7 @@ def from_session(cls, session):
         queries Nvim metadata for type information and sets a SessionHook for
         creating specialized objects from Nvim remote handles.
         """
-        session.error_wrapper = lambda e: NvimError(e[1])
+        session.error_wrapper = lambda e: NvimError(decode_if_bytes(e[1]))
         channel_id, metadata = session.request(b'nvim_get_api_info')
 
         if IS_PYTHON3:

test/test_vim.py

@@ -3,6 +3,8 @@
 import sys
 import tempfile
 
+import pytest
+
 
 def source(vim, code):
     fd, fname = tempfile.mkstemp()
@@ -34,6 +36,12 @@ def test_command_output(vim):
     assert vim.command_output('echo "test"') == 'test'
 
 
+def test_command_error(vim):
+    with pytest.raises(vim.error) as excinfo:
+        vim.current.window.cursor = -1, -1
+    assert excinfo.value.args == ('Cursor position outside buffer',)
+
+
 def test_eval(vim):
     vim.command('let g:v1 = "a"')
     vim.command('let g:v2 = [1, 2, {"v3": 3}]')