Build tests now install RSpec when running tests.

Author: jdantonio

build-tests/runner.rb

@@ -30,6 +30,8 @@
 
 RSPEC = "rspec --default-path #{TEST_PATH} -fd --color --seed 0"
 
+INSTALL_RSPEC_COMMAND = 'gem install rspec'
+
 UNINSTALL_GEMS_COMMAND = <<-CMD
 gem uninstall -q -a -I concurrent-ruby-ext
 gem uninstall -q -a -I concurrent-ruby
@@ -86,6 +88,9 @@ def run_test_suite(files, ext, platform = '')
   ok = system(UNINSTALL_GEMS_COMMAND)
 end
 
+ok = system(INSTALL_RSPEC_COMMAND)
+ok = system(UNINSTALL_GEMS_COMMAND)
+
 puts SUITE_BREAK
 run_test_suite(TEST_FILES, false)
 if jruby?