[ruby/irb] Suppress colorize on Windows tests

https://github.com/ruby/irb/commit/5be9354cf9

lib/irb/workspace.rb

@@ -175,7 +175,7 @@ EOF
       body = (start_pos..end_pos).map do |current_pos|
         sprintf(fmt, pos == current_pos ? '=>' : '', current_pos + 1, lines[current_pos])
       end.join("")
-      "\nFrom: #{file} @ line #{pos + 1} :\n\n#{body}#{Color.clear}\n"
+      "\nFrom: #{file} @ line #{pos + 1} :\n\n#{body}#{Color.clear if use_colorize}\n"
     end
 
     def IRB.delete_caller

test/irb/test_workspace.rb

@@ -9,6 +9,7 @@ require 'irb/color'
 module TestIRB
   class TestWorkSpace < Test::Unit::TestCase
     def test_code_around_binding
+      IRB.conf[:USE_COLORIZE] = false
       Tempfile.create('irb') do |f|
         code = <<~RUBY
           # 1
@@ -33,6 +34,8 @@ module TestIRB
 
         EOS
       end
+    ensure
+      IRB.conf.delete(:USE_COLORIZE)
     end
 
     def test_code_around_binding_with_existing_unreadable_file
@@ -52,6 +55,7 @@ module TestIRB
     end
 
     def test_code_around_binding_with_script_lines__
+      IRB.conf[:USE_COLORIZE] = false
       with_script_lines do |script_lines|
         Tempfile.create('irb') do |f|
           code = "IRB::WorkSpace.new(binding)\n"
@@ -67,6 +71,8 @@ module TestIRB
           EOS
         end
       end
+    ensure
+      IRB.conf.delete(:USE_COLORIZE)
     end
 
     def test_code_around_binding_on_irb