Change to extract test helpers for wrapping options dsl in a class

spec/spec_helper.rb

@@ -27,6 +27,18 @@ def new_parameter(type, name, **settings)
     param_class = Object.const_get("TTY::Option::Parameter::#{type.capitalize}")
     param_class.new(name, **settings)
   end
+
+  def command(name = "Command", parent = nil, &block)
+    stub_const(name, parent ? Class.new(parent) : Class.new)
+    klass = Object.const_get(name)
+    klass.send :include, TTY::Option
+    klass.class_eval(&block) if block
+    klass
+  end
+
+  def new_command(&block)
+    command(&block).new
+  end
 end
 
 RSpec.configure do |config|

spec/unit/help_spec.rb

@@ -1,17 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe TTY::Option::Formatter do
-  def command(&block)
-    stub_const("Command", Class.new)
-    Command.send :include, TTY::Option
-    Command.class_eval(&block)
-    Command
-  end
-
-  def new_command(&block)
-    command(&block).new
-  end
-
   context "Usage header & footer" do
     it "includes header and footer in help display" do
       cmd = new_command do

spec/unit/parse_spec.rb

@@ -1,17 +1,6 @@
 # frozen_string_literal: true
 
 RSpec.describe TTY::Option do
-  def command(&block)
-    stub_const("Command", Class.new)
-    Command.send :include, TTY::Option
-    Command.class_eval(&block)
-    Command
-  end
-
-  def new_command(&block)
-    command(&block).new
-  end
-
   it "doesn't allow to register same name parameter" do
     expect {
       command do