Fix tests

Library/Homebrew/cmd/help.rb

@@ -7,6 +7,8 @@ require "help"
 module Homebrew
   module Cmd
     class HelpCmd < AbstractCommand
+      cmd_args { description "Print help information." }
+
       sig { override.void }
       def run
         Help.help

Library/Homebrew/commands.rb

@@ -177,7 +177,10 @@ module Commands
     external_commands_file.atomic_write("#{external_commands.sort.join("\n")}\n")
   end
 
+  sig { params(command: String).returns(T.nilable(T::Array[[String, String]])) }
   def self.command_options(command)
+    return if command == "help"
+
     path = self.path(command)
     return if path.blank?