test: Updated xlog unit tests.

[benz9527]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.46154% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 77.72%. Comparing base (1e18cb1) to head (350ac41).

Files	Patch %	Lines
xlog/rotate_log.go	84.61%	2 Missing ⚠️
xlog/single_log.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   77.25%   77.72%   +0.47%     
==========================================
  Files          72       72              
  Lines        9074     9083       +9     
==========================================
+ Hits         7010     7060      +50     
+ Misses       1587     1556      -31     
+ Partials      477      467      -10     

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