RPC: turn errors from async calls into notifications

Previously, nvim sent a response with invalid request id (UINT64_MAX).
In functionaltests, catch unexpected error notifications in after_each().

1 files changed, 10 insertions, 0 deletions

diff --git a/test/functional/api/vim_spec.lua b/test/functional/api/vim_spec.lua
index 6261458f2a..ddf5575e31 100644
--- a/test/functional/api/vim_spec.lua
+++ b/test/functional/api/vim_spec.lua
@@ -14,6 +14,7 @@ local ok, nvim_async, feed = helpers.ok, helpers.nvim_async, helpers.feed
 local os_name = helpers.os_name
 local request = helpers.request
 local source = helpers.source
+local next_msg = helpers.next_msg
 
 local expect_err = global_helpers.expect_err
 local format_string = global_helpers.format_string
@@ -46,6 +47,15 @@ describe('API', function()
                request, nil)
   end)
 
+  it('handles errors in async requests', function()
+    local error_types = meths.get_api_info()[2].error_types
+    nvim_async("bogus")
+    eq({'notification', 'nvim_error_event',
+        {error_types.Exception.id, 'Invalid method: nvim_bogus'}}, next_msg())
+    -- error didn't close channel.
+    eq(2, eval('1+1'))
+  end)
+
   describe('nvim_command', function()
     it('works', function()
       local fname = helpers.tmpname()