[FEATURE] Add self-tests in greedy_algorithms/kruskals_minimum_spanning_tree.cpp #2509
Description
Detailed description
The algorithm was documented in #2482, however, it is still missing self-test implementations that make sure the algorithm works as expected, which will make the algorithm fully up to our guidelines.
Context
This is very much needed as without self-tests, it cannot be proved whether the algorithm gives the correct output.
Possible implementation
No response
Additional information
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