fix(coverity/348300): free memory when overiding sing attribute

Nothing prevent the user from doing `:sign define abc culhl=Normal
culhl=Normal` and thus this leads to an obvious memory leak.

1 files changed, 8 insertions, 1 deletions

diff --git a/test/functional/ex_cmds/sign_spec.lua b/test/functional/ex_cmds/sign_spec.lua
index 891cfe1670..f280a45174 100644
--- a/test/functional/ex_cmds/sign_spec.lua
+++ b/test/functional/ex_cmds/sign_spec.lua
@@ -1,5 +1,5 @@
 local helpers = require('test.functional.helpers')(after_each)
-local clear, nvim, eq = helpers.clear, helpers.nvim, helpers.eq
+local clear, nvim, eq, assert_alive = helpers.clear, helpers.nvim, helpers.eq, helpers.assert_alive
 
 describe('sign', function()
   before_each(clear)
@@ -21,4 +21,11 @@ describe('sign', function()
       end)
     end)
   end)
+
+  describe('define {id}', function()
+    it ('does not leak memory when specifying multiple times the same argument', function()
+      nvim('command', 'sign define Foo culhl=Normal culhl=Normal')
+      assert_alive()
+    end)
+  end)
 end)