完善task & 补充测试

[hookokoko]

#9
#7

[codecov]

Codecov Report

Merging #10 (b0d9bd7) into dev (c92c5b1) will increase coverage by 80.61%.
The diff coverage is 85.33%.

@@           Coverage Diff            @@
##           dev      #10       +/-   ##
========================================
+ Coverage     0   80.61%   +80.61%     
========================================
  Files        0        3        +3     
  Lines        0       98       +98     
========================================
+ Hits         0       79       +79     
- Misses       0       17       +17     
- Partials     0        2        +2     

Files	Coverage Δ
pkg/iterator/iterator.go	100.00% <100.00%> (ø)
task.go	74.60% <81.03%> (ø)

... and 1 file with indirect coverage changes

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