Rajatestejä

Rajatestejä, often translated as "boundary testing," is a software testing technique that focuses on testing the extreme values or limits of input data. Instead of testing typical or "happy path" inputs, boundary testing targets values at the edges of valid ranges, as well as values just inside and just outside these boundaries. The principle behind this method is that errors are often found at these extreme points where software may not handle the transitions correctly.

The process typically involves identifying valid input ranges for a given field or parameter. For example, if a field accepts numbers between 1 and 100, the boundary values would be 1 and 100. Boundary testing would then include testing the values 1, 100, 0 (just below the lower boundary), and 101 (just above the upper boundary). This systematic approach helps uncover potential issues related to overflow, underflow, off-by-one errors, and other boundary-related defects that might be missed by random or equivalence partitioning testing alone. It's a crucial part of ensuring software robustness and reliability.