How to clear basic authentication details in chrome
It seems chrome will always show you the login prompt if you include a username in the url e.g.
This is not a real full solution, see Mike's comment below.
You can open an incognito window Ctrl+Shift+n each time you are doing a test. The incognito window will not remember the username and password the last time you entered.
To use this trick, make sure to close all incognito windows. All incognito windows share the same cache. In other words, you cannot open multiple independent incognito windows. If you login in one of them and open another one, those two are related and you will see that the new window remembers the authentication information from the first window.
all you need to do is to type chrome://restart in the address bar and chrome, with all its apps that are running in background, will restart and the Auth password cache will be cleaned.