ruby: Get rid of old Test::Unit compatibility

See this commit in hivex:
6dbbc474d3

(cherry picked from commit ecf361d723)

ruby/Makefile.am

@@ -40,8 +40,7 @@ EXTRA_DIST = \
 	lib/guestfs.rb \
 	run-bindtests \
 	run-ruby-tests \
-	t/tc_*.rb \
-	t/test_helper.rb
+	t/tc_*.rb
 
 CLEANFILES += \
 	lib/*~ \

ruby/t/tc_010_load.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test010Load < Minitest::Test
   def test_010_load

ruby/t/tc_020_create.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test020Create < Minitest::Test
   def test_020_create

ruby/t/tc_030_create_flags.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test030CreateFlags < Minitest::Test
   def test_030_create_flags

ruby/t/tc_040_create_multiple.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test040CreateMultiple < Minitest::Test
   def test_040_create_multiple

ruby/t/tc_050_handle_properties.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test050HandleProperties < Minitest::Test
   def test_050_handle_properties

ruby/t/tc_060_explicit_close.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test060ExplicitClose < Minitest::Test
   def test_060_explicit_close

ruby/t/tc_070_optargs.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test070Optargs < Minitest::Test
   def test_070_optargs

ruby/t/tc_090_retvalues.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test090RetValues < Minitest::Test
   def test_090_retvalues

ruby/t/tc_100_launch.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test100Launch < Minitest::Test
   def test_100_launch

ruby/t/tc_410_close_event.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test410CloseEvent < Minitest::Test
   def test_410_close_event

ruby/t/tc_420_log_messages.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test420LogMessages < Minitest::Test
   def test_420_log_messages

ruby/t/tc_800_rhbz507346.rb

@@ -15,7 +15,8 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test800RHBZ507346 < Minitest::Test
   def test_800_rhbz507346

ruby/t/tc_810_rhbz664558c6.rb

@@ -19,7 +19,8 @@
 # the interpreter to segfault.  See:
 # https://bugzilla.redhat.com/show_bug.cgi?id=664558#c6
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test810RHBZ664558C6 < Minitest::Test
   def test_810_rhbz_664558c6

ruby/t/tc_820_rhbz1046509.rb

@@ -18,7 +18,8 @@
 # Test that we don't break the old ::create module function while
 # fixing https://bugzilla.redhat.com/show_bug.cgi?id=1046509
 
-require File::join(File::dirname(__FILE__), 'test_helper')
+require 'minitest/autorun'
+require 'guestfs'
 
 class Test820RHBZ1046509 < Minitest::Test
   def _handleok(g)

ruby/t/test_helper.rb

@@ -1,33 +0,0 @@
-# libguestfs Ruby bindings -*- ruby -*-
-# Copyright (C) 2009-2023 Red Hat Inc.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-
-begin
-  require 'minitest/autorun'
-rescue LoadError
-  require 'test/unit'
-  MiniTest = Test
-  module Test
-    Assertions = Unit::Assertions
-    module Assertions
-      alias refute_nil assert_not_nil
-    end
-  end
-end
-
-$:.unshift(File::join(File::dirname(__FILE__), "..", "lib"))
-$:.unshift(File::join(File::dirname(__FILE__), "..", "ext", "guestfs"))
-require 'guestfs'