Software Testability is simply how easily a software program can be tested. Which one characteristics does not lead to testable software?
Repairability
Pressman lists the characteristics that make software testable: operability, observability, controllability, decomposability, simplicity, stability and understandability.
Observability — “what you see is what you test”: distinct output for each input, visible system states and variables.
Controllability — the better the software can be controlled, the more testing can be automated; all outputs can be generated through some combination of inputs.
Understandability — the more information available (design, documentation, dependencies), the smarter the tests.
Repairability concerns how easily a defect can be fixed after it is found, which is a maintainability attribute; it is not one of the characteristics that make software easier to test.
Repairability option is correct.
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