api: Add tests for when not to handle NULs.

1 files changed, 9 insertions, 0 deletions

diff --git a/test/functional/api/vim_spec.lua b/test/functional/api/vim_spec.lua
index f34df8cefb..2c17a2acd0 100644
--- a/test/functional/api/vim_spec.lua
+++ b/test/functional/api/vim_spec.lua
@@ -36,6 +36,10 @@ describe('vim_* functions', function()
       -- 19 * 2 (each japanese character occupies two cells)
       eq(44, nvim('strwidth', 'neovimのデザインかなりまともなのになってる。'))
     end)
+
+    it('cannot handle NULs', function()
+      eq(0, nvim('strwidth', '\0abc'))
+    end)
   end)
 
   describe('{get,set}_current_line', function()
@@ -52,6 +56,11 @@ describe('vim_* functions', function()
       eq({1, 2, {['3'] = 1}}, nvim('get_var', 'lua'))
       eq({1, 2, {['3'] = 1}}, nvim('eval', 'g:lua'))
     end)
+
+    it('truncates values with NULs in them', function()
+      nvim('set_var', 'xxx', 'ab\0cd')
+      eq('ab', nvim('get_var', 'xxx'))
+    end)
   end)
 
   describe('{get,set}_option', function()