feat: add calendar tests

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.67% (target: -0.50%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (a4e3c4197b6bc860f738de3a54b2f4332485ba03) | 3955 | 3085 | 78.00% | | | Head commit (697259fad2eb047bbf0d1f26f423461dd99e8cec) | 2040 (-1915) | 1605 (-1480) | 78.68% (**+0.67%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#338) | 27 | 27 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[eloyjm]

Buen trabajo