fix: compatible with midway mock

[chenbin92]

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-io]

Codecov Report

Merging #299 into master will decrease coverage by 0.08%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master     #299      +/-   ##
==========================================
- Coverage    86.7%   86.61%   -0.09%     
==========================================
  Files          35       35              
  Lines         692      695       +3     
  Branches       47       48       +1     
==========================================
+ Hits          600      602       +2     
- Misses         82       83       +1     
  Partials       10       10

Impacted Files	Coverage Δ
packages/midway-mock/src/index.ts	82.6% <40%> (-2.4%)	⬇️

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