An application team is running tests to ensure that user entry fields will not accept invalid input of any length. What type of negative testing is this an example of?

Reasonable data testing focuses on whether the application accepts or rejects data that is logically plausible or implausible in content (e.g., entering a negative age), not specifically on the length of the input.

Population of required fields testing verifies that the application enforces mandatory field completion and rejects form submission when required fields are left blank, which is unrelated to input length validation.

Testing that user entry fields will not accept invalid input 'of any length' directly maps to 'allowed number of characters' negative testing, which validates that input fields enforce minimum and maximum character length constraints. This type of test verifies boundary conditions for field length, ensuring the application rejects input that exceeds or falls below defined character limits. It is a form of negative testing because it confirms the system correctly handles out-of-bound length inputs rather than valid ones.

Session testing evaluates the security and behavior of user sessions, such as session timeout, session hijacking prevention, or concurrent session handling, which is unrelated to validating the length of user input fields.