Write tests for 'brew list --version [--cask]'.

HELP WANTED! How can I create test packages in the 'Caskroom'?

I can only run 'brew tests' on Linux, because my Mac Mini (macOS 14.7.2)
fails due to missing "mutex.h" (or some such).

At least the new test for 'brew list --version' succeeds (on Linux).

Squashed commits to (partial) success:
Try 'brew style list_spec.rb'.
Try 'rubocop -a'.
Generic OS fails.
Generic OS fails again.
The 'Caskroom' is not yet populated.

Library/Homebrew/test/cmd/list_spec.rb

@@ -4,19 +4,44 @@
 require "cmd/shared_examples/args_parse"
 
 RSpec.describe Homebrew::Cmd::List do
-  let(:formulae) { %w[bar foo qux] }
+  let(:formulae) { %w[bar qux foo] }
+  let(:casks) { %w[tex git sgb] }
 
   it_behaves_like "parseable arguments"
 
   it "prints all installed Formulae", :integration_test do
     formulae.each do |f|
       (HOMEBREW_CELLAR/f/"1.0/somedir").mkpath
     end
+    # casks.each do |f|
+    #   (HOMEBREW_CELLAR/"../Caskroom"/f/"42.0/somedir").mkpath
+    # end
 
     expect { brew "list", "--formula" }
-      .to output("#{formulae.join("\n")}\n").to_stdout
+      .to output("#{formulae.sort.join("\n")}\n").to_stdout
       .and not_to_output.to_stderr
       .and be_a_success
+
+    # expect { brew "list", "--cask" }
+    #   .to output("#{casks.sort.join("\n")}\n").to_stdout
+    #   .and not_to_output.to_stderr
+    #   .and be_a_success
+
+    expect { brew "list", "--formula", "--version" }
+      .to output("#{formulae.sort.map { |name| "#{name} 1.0" }.join("\n")}\n").to_stdout
+      .and not_to_output.to_stderr
+      .and be_a_success
+
+    # expect { brew "list", "--cask", "--version" }
+    #   .to output("#{casks.sort.map{|name| name + " 42.0\n"}}\n").to_stdout
+    #   .and not_to_output.to_stderr
+    #   .and be_a_success
+
+    # expect { brew "list", "--version" }
+    #   .to output("#{formulae.sort.map { |name| "#{name} 1.0" }.join("\n")}\n" +
+    #              "#{casks.sort.map { |name| "#{name} 42.0" }.join("\n")}\n").to_stdout
+    #   .and not_to_output.to_stderr
+    #   .and be_a_success
   end
 
   # TODO: add a test for the shell fast-path (`brew_sh`)