docs: add more test cases of answer

[LinuxSuRen]

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[codacy-production]

Coverage summary from Codacy

Merging #82 (d5550bf) into master (73f8555) - See PR on Codacy

Coverage variation	Diff coverage
+0.00%	∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (73f8555)	1304	1222	93.71%
Head commit (d5550bf)	1304 (+0)	1222 (+0)	93.71% (+0.00%)

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 (#82)	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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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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0.0% Duplication