fix: Remove Deno.test from source files

[MikuroXina]

• Enable doc test
• Remove Deno.test from source file

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (a3e9b04) 66.83% compared to head (12d2d52) 40.98%.

Files	Patch %	Lines
src/list.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #151       +/-   ##
===========================================
- Coverage   66.83%   40.98%   -25.85%     
===========================================
  Files          39       41        +2     
  Lines        4577     3938      -639     
  Branches      128       54       -74     
===========================================
- Hits         3059     1614     -1445     
- Misses       1518     2324      +806     

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