What is true for a system to be proper testable?
(a) It must be possible to control each components internal state and then observe its output
(b) It must be possible to control each components output and then observe its internal state
(c) it may or may not be possible to control each components internal state and then observe its output
(d) None of the mentioned
This question was posed to me in a job interview.
The doubt is from System Quality Attributes Not Discernable At Runtime in division Architectural Patterns and Styles of Software Architecture