fix(vim.system): improve error message when cwd does not exist

Problem:
vim.uv.spawn will emit ENOENT for either when the cmd or cwd do not
exist and does not tell you which.

Solution:
If an error occurs, check if cwd was supplied and included in the error
message if it does not exist.

1 files changed, 6 insertions, 1 deletions

diff --git a/test/functional/lua/system_spec.lua b/test/functional/lua/system_spec.lua
index 5abd901a9d..52206b7906 100644
--- a/test/functional/lua/system_spec.lua
+++ b/test/functional/lua/system_spec.lua
@@ -55,9 +55,14 @@ describe('vim.system', function()
     describe('(' .. name .. ')', function()
       it('failure modes', function()
         t.matches(
-          'ENOENT%: no such file .*: "non%-existent%-cmd"',
+          "ENOENT%: no such file .* %(cmd%): 'non%-existent%-cmd'",
           t.pcall_err(system, { 'non-existent-cmd', 'arg1', 'arg2' }, { text = true })
         )
+
+        t.matches(
+          "ENOENT%: no such file .* %(cwd%): 'non%-existent%-cwd'",
+          t.pcall_err(system, { 'echo', 'hello' }, { cwd = 'non-existent-cwd', text = true })
+        )
       end)
 
       it('can run simple commands', function()