Adding more tests to make sure when the user sets a password, the min/max...

Adding more tests to make sure when the user sets a password, the min/max password lengths are checked.

* to testHelpers, add a generateString function which generates a string of the specified length.
* Replace the manual creation of strings for long passwords with generateString.
* To verify_email_address_test, adding checks for min and max length when setting the password.

issue #1173