Mock addPyFile in spark test

[pingsutw]

Tracking issue

NA

Why are the changes needed?

To fix the spark unit test

What changes were proposed in this pull request?

Mock addPyFile since the CI machine doesn't seem to have enough disk space
related issue: https://stackoverflow.com/a/25707870/9574775

How was this patch tested?

unit test

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

NA

Docs link

NA

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.85%. Comparing base (7862ea2) to head (544d65d).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2770       +/-   ##
===========================================
+ Coverage   72.49%   83.85%   +11.35%     
===========================================
  Files         194        3      -191     
  Lines       19872      161    -19711     
  Branches     3921        0     -3921     
===========================================
- Hits        14406      135    -14271     
+ Misses       4768       26     -4742     
+ Partials      698        0      -698     

Flag	Coverage Δ
	83.85% <ø> (+11.35%)	⬆️

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