log which config format AR uses to connect with

1 files changed, 19 insertions, 0 deletions

diff --git a/railties/test/application/initializers/active_record_test.rb b/railties/test/application/initializers/active_record_test.rb
index 4a0b8fd56a..edf78a8a0a 100644
--- a/railties/test/application/initializers/active_record_test.rb
+++ b/railties/test/application/initializers/active_record_test.rb
@@ -39,5 +39,24 @@ module ApplicationTests
       # clean up
       FileUtils.rm("#{app_path}/#{database_path}")
     end
+
+    test "DATABASE_URL env var takes precedence over config/database.yml" do
+      database_path = "/db/foo.sqlite3"
+      ENV['DATABASE_URL'] = "sqlite3://#{database_path}"
+      simple_controller
+
+      get '/foo'
+      assert File.read("#{app_path}/log/production.log").include?("DATABASE_URL")
+
+      # clean up
+      FileUtils.rm("#{app_path}/#{database_path}")
+    end
+
+    test "logs the use of config/database.yml" do
+      simple_controller
+
+      get '/foo'
+      assert File.read("#{app_path}/log/production.log").include?("database.yml")
+    end
   end
 end