Looking for logging into the Facebook Test User site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Facebook Test User site. After that you can login as usual with your login credentials.
https://developers.facebook.com/docs/facebook-login/testing-your-login-flow?locale=ja_JP
https://developers.facebook.com/docs/apps/test-users?locale=ja_JP
https://developers.facebook.com/docs/facebook-login/testing-your-login-flow/
https://stackoverflow.com/questions/8673375/how-to-login-using-facebook-test-users-created-from-the-facebook-developer-app
https://qiita.com/ampersand/items/a96449cd25886a6d05fb
http://kayakuguri.github.io/blog/2014/08/07/facebook-test-user/
https://daipresents.com/2017/facebook-test-users/
https://usortblog.com/facebook-testuser/
https://techblog.zozo.com/entry/facebook_graph_api
https://www.thewindowsclub.com/how-to-create-test-account-on-facebook
https://webapps.stackexchange.com/questions/17529/how-do-i-make-a-test-account-on-facebook
https://hackernoon.com/running-uitests-with-facebook-login-in-ios-4ac998940c42
https://gist.github.com/kesor/2905476