Avoid defining the same test class in multiple files

Should fix issues with parallel testing sometimes not running all
tests.

This should be viewed skipping whitespace changes.

Fixes [Bug #18731]

Author: jeremyevans

test/optparse/test_acceptable.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-class TestOptionParser::Acceptable < TestOptionParser
+class TestOptionParserAcceptable < TestOptionParser
 
   def setup
     super

test/optparse/test_autoconf.rb

@@ -2,9 +2,7 @@
 require 'test/unit'
 require 'optparse/ac'
 
-class TestOptionParser < Test::Unit::TestCase; end
-
-class TestOptionParser::AutoConf < Test::Unit::TestCase
+class TestOptionParserAutoConf < Test::Unit::TestCase
   def setup
     @opt = OptionParser::AC.new
     @foo = @bar = self.class

test/optparse/test_bash_completion.rb

@@ -2,9 +2,7 @@
 require 'test/unit'
 require 'optparse'
 
-class TestOptionParser < Test::Unit::TestCase
-end
-class TestOptionParser::BashCompletion < Test::Unit::TestCase
+class TestOptionParserBashCompletion < Test::Unit::TestCase
   def setup
     @opt = OptionParser.new
     @opt.define("-z", "zzz") {}

test/optparse/test_cclass.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-class TestOptionParser::CClass < TestOptionParser
+class TestOptionParserCClass < TestOptionParser
   def test_no_argument
     flags = []
     @opt.def_option("-[a-z]") {|x| flags << x}

test/optparse/test_did_you_mean.rb

@@ -6,7 +6,7 @@
   return
 end
 
-class TestOptionParser::DidYouMean < TestOptionParser
+class TestOptionParserDidYouMean < TestOptionParser
   def setup
     super
     @opt.def_option("--foo", Integer) { |v| @foo = v }

test/optparse/test_getopts.rb

@@ -2,9 +2,7 @@
 require 'test/unit'
 require 'optparse'
 
-class TestOptionParser < Test::Unit::TestCase
-end
-class TestOptionParser::Getopts < Test::Unit::TestCase
+class TestOptionParserGetopts < Test::Unit::TestCase
   def setup
     @opt = OptionParser.new
   end

test/optparse/test_kwargs.rb

@@ -3,9 +3,7 @@
 require 'optparse'
 require 'optparse/kwargs'
 
-class TestOptionParser < Test::Unit::TestCase
-end
-class TestOptionParser::KwArg < Test::Unit::TestCase
+class TestOptionParserKwArg < Test::Unit::TestCase
   class K
     def initialize(host:, port: 8080)
       @host = host

test/optparse/test_noarg.rb

@@ -1,23 +1,23 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-module TestOptionParser::NoArg
+module TestOptionParserNoArg
   def setup
     super
     @opt.def_option "--with_underscore" do |x| @flag = x end
     @opt.def_option "--with-hyphen" do |x| @flag = x end
   end
 
   class Def1 < TestOptionParser
-    include NoArg
+    include TestOptionParserNoArg
     def setup
       super
       @opt.def_option("-x") {|x| @flag = x}
       @opt.def_option("--option") {|x| @flag = x}
     end
   end
   class Def2 < TestOptionParser
-    include NoArg
+    include TestOptionParserNoArg
     def setup
       super
       @opt.def_option("-x", "--option") {|x| @flag = x}

test/optparse/test_optarg.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-class TestOptionParser::OptArg < TestOptionParser
+class TestOptionParserOptArg < TestOptionParser
   def setup
     super
     @opt.def_option("-x[VAL]") {|x| @flag = x}

test/optparse/test_placearg.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: false
 require_relative 'test_optparse'
 
-class TestOptionParser::PlaceArg < TestOptionParser
+class TestOptionParserPlaceArg < TestOptionParser
   def setup
     super
     @opt.def_option("-x [VAL]") {|x| @flag = x}