Add `rails test` command to run the test suite

To run the whole test suite:

    $ rails test

To run the test file(s):

    $ rails test test/unit/foo_test.rb [test/unit/bar_test.rb ...]

To run the test suite

    $ rails test [models,helpers,units,controllers,mailers,...]

For more information, see `rails test --help`.

This command will eventually replacing `rake test:*`, and `rake test`
command will actually invoking `rails test` instead.

1 files changed, 183 insertions, 0 deletions

diff --git a/railties/test/application/test_runner_test.rb b/railties/test/application/test_runner_test.rb
new file mode 100644
index 0000000000..49bce508ee
--- /dev/null
+++ b/railties/test/application/test_runner_test.rb
@@ -0,0 +1,183 @@
+require 'isolation/abstract_unit'
+
+module ApplicationTests
+  class TestRunnerTest < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def setup
+      build_app
+      create_schema
+    end
+
+    def teardown
+      teardown_app
+    end
+
+    def test_should_not_display_heading
+      create_test_file
+      run_test_command.tap do |output|
+        assert_no_match /Run options:/, output
+        assert_no_match /Running tests:/, output
+      end
+    end
+
+    def test_run_shortcut
+      create_test_file :models, 'foo'
+      output = Dir.chdir(app_path) { `bundle exec rails t test/models/foo_test.rb` }
+      assert_match /1 tests, 1 assertions, 0 failures/, output
+    end
+
+    def test_run_single_file
+      create_test_file :models, 'foo'
+      assert_match /1 tests, 1 assertions, 0 failures/, run_test_command("test/models/foo_test.rb")
+    end
+
+    def test_run_multiple_files
+      create_test_file :models,  'foo'
+      create_test_file :models,  'bar'
+      assert_match /2 tests, 2 assertions, 0 failures/, run_test_command("test/models/foo_test.rb test/models/bar_test.rb")
+    end
+
+    def test_run_file_with_syntax_error
+      app_file 'test/models/error_test.rb', <<-RUBY
+        require 'test_helper'
+        def; end
+      RUBY
+
+      error_stream = Tempfile.new('error')
+      redirect_stderr(error_stream) { run_test_command('test/models/error_test.rb') }
+      assert_match /SyntaxError/, error_stream.read
+    end
+
+    def test_invoke_rake_test_prepare
+      app_file "lib/tasks/test.rake", <<-RUBY
+        namespace :test do
+          task :prepare do
+            puts "Hello World"
+          end
+        end
+      RUBY
+      create_test_file
+      assert_match /Hello World/, run_test_command
+    end
+
+    def test_run_models
+      create_test_file :models, 'foo'
+      create_test_file :models, 'bar'
+      create_test_file :controllers, 'foobar_controller'
+      run_test_command("models").tap do |output|
+        assert_match /FooTest/, output
+        assert_match /BarTest/, output
+        assert_match /2 tests, 2 assertions, 0 failures/, output
+      end
+    end
+
+    def test_run_helpers
+      create_test_file :helpers, 'foo_helper'
+      create_test_file :helpers, 'bar_helper'
+      create_test_file :controllers, 'foobar_controller'
+      run_test_command('helpers').tap do |output|
+        assert_match /FooHelperTest/, output
+        assert_match /BarHelperTest/, output
+        assert_match /2 tests, 2 assertions, 0 failures/, output
+      end
+    end
+
+    def test_run_units
+      create_test_file :models, 'foo'
+      create_test_file :helpers, 'bar_helper'
+      create_test_file :unit, 'baz_unit'
+      create_test_file :controllers, 'foobar_controller'
+      run_test_command('units').tap do |output|
+        assert_match /FooTest/, output
+        assert_match /BarHelperTest/, output
+        assert_match /BazUnitTest/, output
+        assert_match /3 tests, 3 assertions, 0 failures/, output
+      end
+    end
+
+    def test_run_controllers
+      create_test_file :controllers, 'foo_controller'
+      create_test_file :controllers, 'bar_controller'
+      create_test_file :models, 'foo'
+      run_test_command('controllers').tap do |output|
+        assert_match /FooControllerTest/, output
+        assert_match /BarControllerTest/, output
+        assert_match /2 tests, 2 assertions, 0 failures/, output
+      end
+    end
+
+    def test_run_mailers
+      create_test_file :mailers, 'foo_mailer'
+      create_test_file :mailers, 'bar_mailer'
+      create_test_file :models, 'foo'
+      run_test_command('mailers').tap do |output|
+        assert_match /FooMailerTest/, output
+        assert_match /BarMailerTest/, output
+        assert_match /2 tests, 2 assertions, 0 failures/, output
+      end
+    end
+
+    def test_run_functionals
+      create_test_file :mailers, 'foo_mailer'
+      create_test_file :controllers, 'bar_controller'
+      create_test_file :functional, 'baz_functional'
+      create_test_file :models, 'foo'
+      run_test_command('functionals').tap do |output|
+        assert_match /FooMailerTest/, output
+        assert_match /BarControllerTest/, output
+        assert_match /BazFunctionalTest/, output
+        assert_match /3 tests, 3 assertions, 0 failures/, output
+      end
+    end
+
+    def test_run_integration
+      create_test_file :integration, 'foo_integration'
+      create_test_file :models, 'foo'
+      run_test_command('integration').tap do |output|
+        assert_match /FooIntegration/, output
+        assert_match /1 tests, 1 assertions, 0 failures/, output
+      end
+    end
+
+    def test_run_whole_suite
+      types = [:models, :helpers, :unit, :controllers, :mailers, :functional, :integration]
+      types.each { |type| create_test_file type, "foo_#{type}" }
+      run_test_command('') .tap do |output|
+        types.each { |type| assert_match /Foo#{type.to_s.camelize}Test/, output }
+        assert_match /7 tests, 7 assertions, 0 failures/, output
+      end
+    end
+
+    private
+      def run_test_command(arguments = 'test/unit/test_test.rb')
+        Dir.chdir(app_path) { `bundle exec rails test #{arguments}` }
+      end
+
+      def create_schema
+        app_file 'db/schema.rb', ''
+      end
+
+      def redirect_stderr(target_stream)
+        previous_stderr = STDERR.dup
+        $stderr.reopen(target_stream)
+        yield
+        target_stream.rewind
+      ensure
+        $stderr = previous_stderr
+      end
+
+      def create_test_file(path = :unit, name = 'test')
+        app_file "test/#{path}/#{name}_test.rb", <<-RUBY
+          require 'test_helper'
+
+          class #{name.camelize}Test < ActiveSupport::TestCase
+            def test_truth
+              puts "#{name.camelize}Test"
+              assert true
+            end
+          end
+        RUBY
+      end
+  end
+end