[ISSUES-2716]Add VariableRestfulApi unit test

[binbinCheng]

Add VariableRestfulApi unit test Related issue #2716

[codecov[bot]]

Codecov Report

Merging #2717 (7b62b8a) into dev-1.2.1 (f0834a2) will increase coverage by 0.05%. The diff coverage is n/a.

@@               Coverage Diff               @@
##             dev-1.2.1    #2717      +/-   ##
===============================================
+ Coverage        16.01%   16.07%   +0.05%     
- Complexity        1321     1329       +8     
===============================================
  Files              742      742              
  Lines            23252    23252              
  Branches          3441     3441              
===============================================
+ Hits              3724     3737      +13     
+ Misses           19043    19031      -12     
+ Partials           485      484       -1     

Impacted Files	Coverage Δ
...s/scheduler/queue/fifoqueue/FIFOUserConsumer.scala	37.77% <0.00%> (+2.22%)	:arrow_up:
...inkis/variable/restful/api/VariableRestfulApi.java	27.27% <0.00%> (+27.27%)	:arrow_up:
...he/linkis/variable/receiver/VariableReceiver.scala	44.44% <0.00%> (+44.44%)	:arrow_up:
...is/variable/receiver/VariableReceiverChooser.scala	57.14% <0.00%> (+57.14%)	:arrow_up:

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