make sure `rake test` respects TESTOPTS

We should be able to pass options to minitest via TESTOPTS environment
variable

railties/lib/rails/test_unit/minitest_plugin.rb

 require "active_support/core_ext/module/attribute_accessors"
 require "rails/test_unit/reporter"
 require "rails/test_unit/test_requirer"
+require 'shellwords'
 
 module Minitest
   class SuppressedSummaryReporter < SummaryReporter
@@ -60,7 +61,7 @@ def self.plugin_rails_options(opts, options)
   # as the patterns would also contain the other Rake tasks.
   def self.rake_run(patterns) # :nodoc:
     @rake_patterns = patterns
-    passed = run
+    passed = run(Shellwords.split(ENV['TESTOPTS'] || ''))
     exit passed unless passed
     passed
   end

railties/test/application/test_runner_test.rb

@@ -502,6 +502,19 @@ def test_pass_TEST_env_on_rake_test
       assert_match '1 runs, 1 assertions', output
     end
 
+    def test_rake_passes_TESTOPTS_to_minitest
+      create_test_file :models, 'account'
+      output =  Dir.chdir(app_path) { `bin/rake test TESTOPTS=-v` }
+      assert_match "AccountTest#test_truth", output, "passing TEST= should run selected test"
+    end
+
+    def test_rake_passes_multiple_TESTOPTS_to_minitest
+      create_test_file :models, 'account'
+      output =  Dir.chdir(app_path) { `bin/rake test TESTOPTS='-v --seed=1234'` }
+      assert_match "AccountTest#test_truth", output, "passing TEST= should run selected test"
+      assert_match "seed=1234", output, "passing TEST= should run selected test"
+    end
+
     private
       def run_test_command(arguments = 'test/unit/test_test.rb')
         Dir.chdir(app_path) { `bin/rails t #{arguments}` }