TestUtils#gotoPage() timeouts when the given URL redirects back to the current URL

This happens for instance if you do this in a test:

• call TestUtils#deletePage(), which deletes the page and leaves you on the missing page in view mode
• call TestUtils#createPage() just after, the save URL redirects back to view mode so on the same page as before, the current URL doesn't change and this makes gotoPage timeout because it expects the current URL to change