Feedback Lab 2

[hdmeyer]

Group #	Exercise 1	Comments	Exercise 2	Comments	Exercise 3	Comments	Exercise 4	Comments	Exercise 5	Comments	Exercise 6	Comments	Exercise 7	Comments	Exercise 8	Comments	Total
9	9	Good solution and good analysis. No timing	10	Good solution. Good testset	4	you have not provided a descendent strength list. What means u1?	4	isPermutation is wrong	6	Where are the tests?	8	Nice general solution. The role of parameter n is unclear. Function if alphabet is hardcoded in rotateChar then n must be too.	10	Well done	8	Good solutions to easy problems.	8.085714286
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[schneider-simon]

Hello @hdmeyer

thank you for your valuable feedback. We can see the flaws in almost all of our exercises.

Nonetheless, there is one feedback we could not quite understand. Would you please explain to us why there are tests missing in Exercise5?
It includes a testReport in the comments and a long list of predicates and tests. (l 127-159)

We test if the derangement function produces lists that: have the same length as the output (predicate1), contain the same elements (predicate 2), are a permutation (predicate1+ predicate2) and that they do not share elements at the same position (predicate3).

We can not think of anything else we could test since these 3 predicates exactly mirror the specification.

[hdmeyer]

Hello Simon,

@BertLisser could you please answer this question?

Cheers,

[BertLisser]

Hello Simon Sorry, I overlooked the top lines. The tests with properties which has one argument are okay. But the tests with two arguments are not. The event that random an dearangement will be generated is very small like in: testSameElements :: [Int] -> [Int] -> Bool so the precondition will not be satisfied (mostly). In these cases you test nothing. To see this use verboseCheck. The rating will be raised to 7. Kind regards Bert

…

----- Original Message ----- From: "Simon Schneider" <[email protected]> To: "software-engineering-amsterdam/ST2017_WG_9" <[email protected]> Cc: "Subscribed" <[email protected]> Sent: Tuesday, September 26, 2017 12:56:36 PM Subject: Re: [software-engineering-amsterdam/ST2017_WG_9] Feedback Lab 2 (#3) Hello @hdmeyer thank you for your valuable feedback. We can see the flaws in almost all of our exercises. Nonetheless, there is one feedback we could not quite understand. Would you please explain to us why there are tests missing in Exercise5? It includes a testReport in the comments and a long list of predicates and tests. (l 127-159) We test if the derangement function produces lists that: have the same length as the output (predicate1), contain the same elements (predicate 2), are a permutation (predicate1+ predicate2) and that they do not share elements at the same position (predicate3). We can not think of anything else we could test since these 3 predicates exactly mirror the specification.

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