chore: completion test command sequence

[LangLangBart]

description

Add a completion test for command sequences with different triggers.

Clean up global scope pollution in Zsh:

• cmd_word doesn't need to be global since the zle __fzf_extract_command call doesn't actually
  create a new scope.
• The completion widget is deleted after its usage; its sole purpose is to provide access to the words array.

---

Draft reason:

• Unable to test semicolon (;) and backtick (`)
  • Using them in the test_go.rb file always ends in failure.

--- a/test/test_go.rb
+++ b/test/test_go.rb
@@ -3744,5 +3744,5 @@ module CompletionTest
     triggers = ['**', '~~', '++', 'ff', '/']
     # TODO: Find a way to test semicolon (';') and backtick ('`')
-    triggers.concat(['&', '[']) if instance_of?(TestZsh)
+    triggers.concat([';', '`', '&', '[']) if instance_of?(TestZsh)

     triggers.each do |trigger|

[junegunn]

Unable to test semicolon (;) and backtick (`)

tmux seems to treat a trailing semicolon differently (no official source, just an observation, could be a bug).

$ tmux send-keys 'ha;ha'; echo
ha;ha
$ tmux send-keys 'ha;ha;'; echo
ha;ha
$ tmux send-keys 'ha;ha\;'; echo
ha;ha;

Which means we would have to escape it to \; or ;;.

diff --git a/test/test_go.rb b/test/test_go.rb
index 98c2f25..11dc7a0 100755
--- a/test/test_go.rb
+++ b/test/test_go.rb
@@ -164,6 +164,7 @@ class Tmux
   private
 
   def go(args)
+    args = args.map { |a| a.sub(/;$/, '\;') }
     IO.popen(%w[tmux] + args) { |io| io.readlines(chomp: true) }
   end
 end

Not sure about backticks yet.

[junegunn]

LGTM, thanks!