Fix rake task arg quoting on Windows.

Changelog.md

@@ -13,6 +13,8 @@ Enhancements:
 Bug Fixes:
 
 * Handle invalid UTF-8 strings within exception methods. (Benjamin Fleischer, #1760)
+* Fix Rake Task quoting of file names with quotes to work properly on
+  Windows. (Myron Marston, #1887
 
 ### 3.2.1 / 2015-02-23
 [Full Changelog](http://github.com/rspec/rspec-core/compare/v3.2.0...v3.2.1)

lib/rspec/core/rake_task.rb

@@ -128,7 +128,7 @@ def file_inclusion_specification
 
       if RSpec::Support::OS.windows?
         def escape(shell_command)
-          "'#{shell_command.gsub("'", "\'")}'"
+          "'#{shell_command.gsub("'", "\\\\'")}'"
         end
       else
         require 'shellwords'

spec/rspec/core/rake_task_spec.rb

@@ -47,6 +47,13 @@ def spec_command
       end
     end
 
+    context "on windows, with a quote in the name", :if => RSpec::Support::OS.windows? do
+      it "renders rspec quoted, with quote escaped" do
+        task.rspec_path = "/foo'bar/exe/rspec"
+        expect(spec_command).to include(%q|'/foo\'bar/exe/rspec'|)
+      end
+    end
+
     context "with ruby options" do
       it "renders them before the rspec path" do
         task.ruby_opts = "-w"