What are some negative test cases for a signup page, specifically for fields like first name and email?

Question

Accepted Answer

Negative test cases for a signup page ensure that invalid inputs are handled correctly, preventing user errors.

First name field: Input special characters (e.g., @, #, $) to check if the system rejects them.
Email field: Use an invalid email format (e.g., 'user@domain') to verify that the system prompts for a valid email.
Password field: Enter a password shorter than the minimum required length to ensure the system enforces password policies.
Confirm password: Input a different password than the one entered in the password field to check if the system detects mismatches.
Empty fields: Attempt to submit the form with one or more required fields left blank to ensure proper validation messages are displayed.

Accepted Answer

1) To Verify First name accept digits as input. 
2) To Verify that accepts Special characters. 
For email-
1) To Verify that email id accepts name in uppercase. 
2) To Verify that accepts input without domain name. e.g @gmail.com
3) To Verify that accepts double @@ as a input 
4) To verify that accept id without combination of letters and special characters as input.

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What are some negative test cases for a signup page, specifically for fields like first name and email?

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