test: add unit test for content markdown

[nogic1008]

No description provided.

[commit-lint]

Chore

• deps-dev: add js-yaml package (20d7203)

Tests

• add unit test for /content/series markdown (8f61452)
• songs: add unit test for /content/songs markdown (594b53a)
• series: add chart component uses test (0c15658)
• songs: add Level component test (c248c01)

Contributors

nogic1008

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[codecov]

Codecov Report

Merging #727 (c31a6d7) into master (f4cdc16) will increase coverage by 0.50%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #727      +/-   ##
==========================================
+ Coverage   92.15%   92.66%   +0.50%     
==========================================
  Files          19       20       +1     
  Lines         408      436      +28     
  Branches       30       32       +2     
==========================================
+ Hits          376      404      +28     
  Misses         32       32              

Impacted Files	Coverage Δ
src/content.ts	100.00% <100.00%> (ø)

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