Added 4 tests for Rails Runner. 2 failing tests for $0 and $PROGRAM_NAME [#2244 state:open]

Signed-off-by: José Valim <jose.valim@gmail.com>

railties/test/application/runner_test.rb

@@ -0,0 +1,49 @@
+require 'isolation/abstract_unit'
+
+module ApplicationTests
+  class RunnerTest < Test::Unit::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def setup
+      build_app
+      boot_rails
+
+      # Lets create a model so we have something to play with
+      app_file "app/models/user.rb", <<-MODEL
+      class User
+        def self.count
+          42
+        end
+      end
+      MODEL
+    end
+
+    def test_should_run_ruby_statement
+       assert_match "42", Dir.chdir(app_path) { `bundle exec rails runner "puts User.count"` }
+    end
+
+    def test_should_run_file
+      app_file "script/count_users.rb", <<-SCRIPT
+      puts User.count
+      SCRIPT
+
+      assert_match "42", Dir.chdir(app_path) { `bundle exec rails runner "script/count_users.rb"` }
+    end
+
+    def test_should_set_dollar_0_to_file
+      app_file "script/dollar0.rb", <<-SCRIPT
+      puts $0
+      SCRIPT
+
+      assert_match "script/dollar0.rb", Dir.chdir(app_path) { `bundle exec rails runner "script/dollar0.rb"` }
+    end
+
+    def test_should_set_dollar_program_name_to_file
+      app_file "script/program_name.rb", <<-SCRIPT
+      puts $PROGRAM_NAME
+      SCRIPT
+
+      assert_match "script/program_name.rb", Dir.chdir(app_path) { `bundle exec rails runner "script/program_name.rb"` }
+    end
+  end
+end