Why codechef do not show all test case for a Problem?

We know that codeforces and hackerrank are shown all test case for a problem .
Why codechef do not show all test case for a Problem when we submit code?

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@rashedcs There has been heavy discussion over this topic in the past (link). Revealing test cases after the contest would definitely help us to identify our mistake and will save our a lot of time. But on the other hand, it also makes us think harder and try to identify the corner cases on which are solution is failing.

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Tnq @srd091.

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Showing the test cases is really helpful and time efficient.
I think they do show test cases as subtasks and tasks and codechef even tell us about the range of subtasks. During a contest I think codechef way is better than others.

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