Add distance.cpp test in CMake

[gonidelis]

Neglected to add the unit test when I wrote it, so I just add it now :)

[hkaiser]

@gonidelis could you please have a look at the configuration errors?

[gonidelis]

@hkaiser fixed. sorry about that.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -85.09%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (3add538)	216439	184172	85.09%
Head commit (7f8df5d)	51316 (-165123)	0 (-184172)	0.00% (-85.09%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6471)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[hkaiser]

LGTM, thanks!