Update to use MiniTest instead of the now defunct Test::Unit.

Things pass for me under Ruby 2.2.1

t/test_basic.rb

@@ -1,10 +1,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolBasicTests < Test::Unit::TestCase
+class XdotoolBasicTests < MiniTest::Test
   include XdoTestHelper
 
   def test_noargs_exit_1

t/test_chaining.rb

@@ -1,10 +1,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolChainingTests < Test::Unit::TestCase
+class XdotoolChainingTests < MiniTest::Test
   include XdoTestHelper
 
   def setup

t/test_cmd_behave_screen_edge.rb

@@ -1,10 +1,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandBehaveScreenEdgeTests < Test::Unit::TestCase
+class XdotoolCommandBehaveScreenEdgeTests < MiniTest::Test
   include XdoTestHelper
 
   def test_expected_failures

t/test_cmd_exec.rb

@@ -2,10 +2,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandExecTests < Test::Unit::TestCase
+class XdotoolCommandExecTests < MiniTest::Test
   include XdoTestHelper
 
   def test_expected_failures

t/test_cmd_getwindowname.rb

@@ -1,10 +1,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandGetWindowPidTests < Test::Unit::TestCase
+class XdotoolCommandGetWindowPidTests < MiniTest::Test
   include XdoTestHelper
 
   def assert_is_title(lines)

t/test_cmd_getwindowpid.rb

@@ -1,10 +1,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandGetWindowPidTests < Test::Unit::TestCase
+class XdotoolCommandGetWindowPidTests < MiniTest::Test
   include XdoTestHelper
 
   def test_succeeds_with_valid_window

t/test_cmd_key.rb

@@ -1,10 +1,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandKeyTests < Test::Unit::TestCase
+class XdotoolCommandKeyTests < MiniTest::Test
   include XdoTestHelper
 
   def test_flags

t/test_cmd_windowfocus.rb

@@ -2,10 +2,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandWindowFocusTests < Test::Unit::TestCase
+class XdotoolCommandWindowFocusTests < MiniTest::Test
   include XdoTestHelper
 
   def test_succeeds_with_valid_window

t/test_cmd_windowmap.rb

@@ -2,10 +2,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandWindowMapTests < Test::Unit::TestCase
+class XdotoolCommandWindowMapTests < MiniTest::Test
   include XdoTestHelper
 
   def test_succeeds_with_valid_window

t/test_cmd_windowminimize.rb

@@ -1,10 +1,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandWindowMinimizeTests < Test::Unit::TestCase
+class XdotoolCommandWindowMinimizeTests < MiniTest::Test
   include XdoTestHelper
 
   def test_succeeds_with_valid_window

t/test_cmd_windowmove.rb

@@ -2,10 +2,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandWindowMoveTests < Test::Unit::TestCase
+class XdotoolCommandWindowMoveTests < MiniTest::Test
   include XdoTestHelper
 
   def test_succeeds_with_valid_window

t/test_cmd_windowsize.rb

@@ -2,10 +2,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolCommandWindowSizeTests < Test::Unit::TestCase
+class XdotoolCommandWindowSizeTests < MiniTest::Test
   include XdoTestHelper
 
   def test_succeeds_with_valid_window

t/test_mousemove.rb

@@ -1,9 +1,9 @@
 #!/usr/bin/env ruby
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolMouseMoveTests < Test::Unit::TestCase
+class XdotoolMouseMoveTests < MiniTest::Test
   include XdoTestHelper
 
   def test_mousemove_should_have_no_output

t/test_script.rb

@@ -1,11 +1,11 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 require "tempfile"
 
-class XdotoolScriptTests < Test::Unit::TestCase
+class XdotoolScriptTests < MiniTest::Test
   include XdoTestHelper
 
   def xdotool_script_ok(commands)

t/test_search.rb

@@ -1,10 +1,10 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolSearchTests < Test::Unit::TestCase
+class XdotoolSearchTests < MiniTest::Test
   include XdoTestHelper
 
   def test_search_pid

t/test_typing.rb

@@ -1,11 +1,11 @@
 #!/usr/bin/env ruby
 #
 
-require "test/unit"
+require "minitest"
 require "tempfile"
 require "./xdo_test_helper"
 
-class XdotoolTypingTests < Test::Unit::TestCase
+class XdotoolTypingTests < MiniTest::Test
   include XdoTestHelper
   SYMBOLS = "`12345678990-=~ !@\#$%^&*()_+[]\{}|;':\",./<>?"
   LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

t/test_window.rb

@@ -1,9 +1,9 @@
 #!/usr/bin/env ruby
 
-require "test/unit"
+require "minitest"
 require "./xdo_test_helper"
 
-class XdotoolWindowTests < Test::Unit::TestCase
+class XdotoolWindowTests < MiniTest::Test
   include XdoTestHelper
 
   def setup

t/xdo_test_helper.rb

@@ -1,4 +1,4 @@
-require "test/unit"
+require "minitest"
 
 module XdoTestHelper
   def setup
@@ -145,7 +145,7 @@ def try(options = {})
     (1 .. times).each do
       begin
         yield
-      rescue Test::Unit::AssertionFailedError => e
+      rescue MiniTest::Unit::AssertionFailedError => e
         $stderr.puts "Retrying..."
         last_exception = e
         sleep(delay)