test: add unit tests for ClassApiExporterHelper

[tangcent]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 23.07692% with 30 lines in your changes missing coverage. Please review.

Project coverage is 63.053%. Comparing base (a020e49) to head (4657508).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...tangcent/idea/plugin/api/ClassApiExporterHelper.kt	37.500%	3 Missing and 12 partials ⚠️
...gcent/idea/plugin/api/export/suv/SuvApiExporter.kt	0.000%	15 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##              master     #1179       +/-   ##
===============================================
- Coverage     63.113%   63.053%   -0.060%     
+ Complexity      2398      2394        -4     
===============================================
  Files            255       255               
  Lines          13273     13273               
  Branches        3033      3042        +9     
===============================================
- Hits            8377      8369        -8     
+ Misses          3302      3298        -4     
- Partials        1594      1606       +12     

Flag	Coverage Δ
unittests	63.053% <23.077%> (-0.060%)	⬇️

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Files with missing lines	Coverage Δ
...tangcent/idea/plugin/api/ClassApiExporterHelper.kt	71.569% <37.500%> (-7.843%)	⬇️
...gcent/idea/plugin/api/export/suv/SuvApiExporter.kt	0.000% <0.000%> (ø)

... and 1 file with indirect coverage changes

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