modify to pass the correct argument to the test runner from rake

test runner sets file to be tested in plugin_rails_options,
but in plugin_rails_options, processing has been made to the argument of the
actual command rather than the argument of Minitest.run.

For example, if you run `./bin rake db:migrate test`, the options[:patterns], `db:migrate test` was incorrectly set.

railties/lib/rails/test_unit/minitest_plugin.rb

@@ -29,12 +29,21 @@ def self.plugin_rails_options(opts, options)
     options[:patterns] = opts.order!
   end
 
+  # Running several Rake tasks in a single command would trip up the runner,
+  # as the patterns would also contain the other Rake tasks.
+  def self.rake_run(patterns) # :nodoc:
+    @rake_patterns = patterns
+    run
+  end
+
   def self.plugin_rails_init(options)
     self.run_with_rails_extension = true
 
     ENV["RAILS_ENV"] = options[:environment] || "test"
 
-    ::Rails::TestRequirer.require_files options[:patterns] unless run_with_autorun
+    unless run_with_autorun
+      ::Rails::TestRequirer.require_files @rake_patterns || options[:patterns]
+    end
 
     unless options[:full_backtrace] || ENV["BACKTRACE"]
       # Plugin can run without Rails loaded, check before filtering.

railties/lib/rails/test_unit/testing.rake

@@ -7,7 +7,7 @@ task default: :test
 desc "Runs all tests in test folder"
 task :test do
   $: << "test"
-  Minitest.run(['test'])
+  Minitest.rake_run(["test"])
 end
 
 namespace :test do
@@ -24,22 +24,22 @@ namespace :test do
   ["models", "helpers", "controllers", "mailers", "integration", "jobs"].each do |name|
     task name => "test:prepare" do
       $: << "test"
-      Minitest.run(["test/#{name}"])
+      Minitest.rake_run(["test/#{name}"])
     end
   end
 
   task :generators => "test:prepare" do
     $: << "test"
-    Minitest.run(["test/lib/generators"])
+    Minitest.rake_run(["test/lib/generators"])
   end
 
   task :units => "test:prepare" do
     $: << "test"
-    Minitest.run(["test/models", "test/helpers", "test/unit"])
+    Minitest.rake_run(["test/models", "test/helpers", "test/unit"])
   end
 
   task :functionals => "test:prepare" do
     $: << "test"
-    Minitest.run(["test/controllers", "test/mailers", "test/functional"])
+    Minitest.rake_run(["test/controllers", "test/mailers", "test/functional"])
   end
 end