Preseve args_parse test for new commands

Library/Homebrew/test/cmd/list_spec.rb

@@ -1,10 +1,13 @@
 # frozen_string_literal: true
 
 require "cmd/list"
+require "cmd/shared_examples/args_parse"
 
 RSpec.describe Homebrew::Cmd::List do
   let(:formulae) { %w[bar foo qux] }
 
+  it_behaves_like "parseable arguments"
+
   it "prints all installed Formulae", :integration_test do
     formulae.each do |f|
       (HOMEBREW_CELLAR/f/"1.0/somedir").mkpath

Library/Homebrew/test/cmd/shared_examples/args_parse.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-RSpec.shared_examples "parseable arguments" do
+RSpec.shared_examples "parseable arguments" do |argv: []|
   subject(:method_name) { "#{command_name.tr("-", "_")}_args" }
 
   let(:command_name) do |example|
@@ -8,10 +8,13 @@ RSpec.shared_examples "parseable arguments" do
   end
 
   it "can parse arguments" do
-    require "dev-cmd/#{command_name}" unless require? "cmd/#{command_name}"
-
-    parser = Homebrew.public_send(method_name)
-
-    expect(parser).to respond_to(:parse)
+    if described_class
+      cmd = described_class.new(argv)
+      expect(cmd.args).to be_a Homebrew::CLI::Args
+    else
+      require "dev-cmd/#{command_name}" unless require? "cmd/#{command_name}"
+      parser = Homebrew.public_send(method_name)
+      expect(parser).to respond_to(:parse)
+    end
   end
 end

Library/Homebrew/test/dev-cmd/prof_spec.rb

@@ -1,8 +1,11 @@
 # frozen_string_literal: true
 
+require "cmd/shared_examples/args_parse"
 require "dev-cmd/prof"
 
 RSpec.describe Homebrew::DevCmd::Prof do
+  it_behaves_like "parseable arguments", argv: ["--", "help"]
+
   describe "integration tests", :integration_test, :needs_network do
     after do
       FileUtils.rm_rf HOMEBREW_LIBRARY_PATH/"prof"