Tests for XMLHttpRequest authentication.

sync: User: sync, password: 123.
sync2: User: sync2, password: 123.
sync3: User: sync3, password: 123.
sync4: User: sync4, password: 123.
sync5: User: sync5, password: 123.
sync6: User: sync6, password: 123.
sync7: User: sync7, password: 123.
async: User: async, password: 123.
async2: User: async2, password: 123.
async3: User: async3, password: 123.
async4: User: async4, password: 123.
async5: User: async5, password: 123.
async6: User: async6, password: 123.
async7: User: async7, password: 123.