How to write Test cases for Login screen?

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How to write Test cases for Login screen?

the format for all test cases could be something like this
1. test cases for GUI
2. +ve test cases for login.
3. -ve test cases for login.
in the -ve scenario :- we should include boundary analysis to create test cases ,Value Analysis. Equivalence Classes,Positive and Negative test cases) plus cross-site scripting and SQL injection. SQL injection is especially high-risk for login pages.
( Test case is Enter special char for username and it should displays a message that username should have char a-z and 0-9 )

(Continued on next question...)

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