1 files changed, 34 insertions, 2 deletions

diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index 1bf59c2b8e..d90582d3db 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -7,11 +7,43 @@ module ApplicationTests
     def setup
       build_app
       boot_rails
+      Object.send(:remove_const, :RAILS_ROOT)
     end
 
     test "the application root is set correctly" do
-      # require "#{app_path}/config/environment"
-      # assert_equal app_path, Rails.application.root
+      require "#{app_path}/config/environment"
+      assert_equal app_path, Rails.application.root
+    end
+
+    test "the application root can be set" do
+      FileUtils.mkdir_p("#{app_path}/hello")
+      add_to_config <<-RUBY
+        config.frameworks = []
+        config.root = '#{app_path}/hello'
+      RUBY
+      require "#{app_path}/config/environment"
+      assert_equal "#{app_path}/hello", Rails.application.root
+    end
+
+    test "the application root is detected as where config.ru is located" do
+      add_to_config <<-RUBY
+        config.frameworks = []
+      RUBY
+      FileUtils.mv "#{app_path}/config.ru", "#{app_path}/config/config.ru"
+      require "#{app_path}/config/environment"
+      assert_equal "#{app_path}/config", Rails.application.root
+    end
+
+    test "the application root is Dir.pwd if there is no config.ru" do
+      File.delete("#{app_path}/config.ru")
+      add_to_config <<-RUBY
+        config.frameworks = []
+      RUBY
+
+      Dir.chdir("#{app_path}/app") do
+        require "#{app_path}/config/environment"
+        assert_equal "#{app_path}/app", Rails.application.root
+      end
     end
   end
 end
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