linear.rb:30-32: Add unit-tests. We should add unit-tests...

[0pdd]

The puzzle 532-a6c77906 from #532 has to be resolved:

0pdd/model/linear.rb

Lines 30 to 32 in 9d7b1ae

	# @todo #532:60min Add unit-tests.
	# We should add unit-tests for this class that checks puzzle ranking.
	# For now its untested, don't forget to remove this puzzle.

The puzzle was created by rultor on 02-Feb-24.

Estimate: 60 minutes, role: DEV.

If you have any technical questions, don't ask me, submit new tickets instead. The task will be "done" when the problem is fixed and the text of the puzzle is removed from the source code. Here is more about PDD and about me.