test: add unit tests for ClassApiExporterHelper

[tangcent]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 27 lines in your changes missing coverage. Please review.

Project coverage is 63.728%. Comparing base (42969f3) to head (160817b).
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%	12 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##              master      #560       +/-   ##
===============================================
- Coverage     63.798%   63.728%   -0.070%     
+ Complexity      2032      2028        -4     
===============================================
  Files            224       224               
  Lines          11447     11447               
  Branches        2579      2587        +8     
===============================================
- Hits            7303      7295        -8     
+ Misses          2794      2793        -1     
- Partials        1350      1359        +9     

Flag	Coverage Δ
unittests	63.728% <25.000%> (-0.070%)	⬇️

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

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