Black box testing, also called functional testing and behavioral testing, focuses on
determining whether or not a program does what it is supposed to do based on its
functional requirements. Black box testing attempts to find errors in the external
behavior of the code in the following categories:
(1) incorrect or missing
(2) interface errors
(3) errors in data structures used by interfaces
(4)behavior or performance errors
(5) initialization and termination errors. Through
this testing, we can determine if the functions appear to work according to specifications.
However, it is important to note that no amount of testing can unequivocally demonstrate
the absence of errors and defects in your code.