Boundary Value

Boundary Value refers to the testing technique that focuses on evaluating the behavior of a software system at the boundaries of input data, where errors are more likely to occur. It is based on the principle that defects often occur at the edges of input ranges rather than within the middle, so testing these boundary values helps identify potential issues.

Key components of boundary value testing include:

• Edge Cases: Identifying the minimum, maximum, and just outside the boundaries of valid input ranges, such as testing the lowest and highest values that the system can handle.
• Valid Boundaries: Testing values that lie within the acceptable range, ensuring the system behaves correctly at both ends of the input spectrum.
• Invalid Boundaries: Testing values just outside the acceptable range, ensuring the system appropriately handles out-of-range inputs (e.g., rejecting a negative number when only positive values are allowed).
• Off-by-One Errors: Boundary value testing helps uncover errors related to incorrect handling of boundary conditions, such as missing a value or allowing one too many or too few inputs.

Boundary value testing helps ensure that the application functions as expected at the edges of input ranges, reducing the likelihood of errors in critical areas. It is an essential technique for improving the robustness and reliability of the system.