Add basic card tests

[hxtree]

This pull request adds basic tests for the BasicCard component.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.14%	✅ 66.67%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (8b14385)	2222	1606	72.28%
Head commit (5313a2d)	2226 (+4)	1612 (+6)	72.42% (+0.14%)

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 (#866)	6	4	66.67%

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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