[WIP] test: fix coverage

[atian25]

Checklist

• [ ] npm test passes
• [ ] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [ ] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov[bot]]

Codecov Report

Base: 99.22% // Head: 66.29% // Decreases project coverage by -32.93% :warning:

Coverage data is based on head (50f321e) compared to base (e9bba31). Patch coverage: 93.33% of modified lines in pull request are covered.

:exclamation: Current head 50f321e differs from pull request most recent head de89c07. Consider uploading reports for the commit de89c07 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #59       +/-   ##
===========================================
- Coverage   99.22%   66.29%   -32.94%     
===========================================
  Files           6        6               
  Lines         519      534       +15     
  Branches      102       46       -56     
===========================================
- Hits          515      354      -161     
- Misses          4      180      +176     

Impacted Files	Coverage Δ
app/extend/context.js	58.70% <93.33%> (-39.94%)	:arrow_down:
app/middleware/multipart.js	37.50% <0.00%> (-62.50%)	:arrow_down:
app/schedule/clean_tmpdir.js	46.42% <0.00%> (-53.58%)	:arrow_down:
app.js	80.95% <0.00%> (-19.05%)	:arrow_down:
lib/utils.js	89.87% <0.00%> (-10.13%)	:arrow_down:

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