[tests] migrate to unittest.assertEqual

[emmanuel-ferdman]

Before submitting

• Lint code. If there are lint issues, please format the code first.

# Install and register `pre-commit` in the project folder
pip install pre-commit && pre-commit install

# Process previous code files separately
pre-commit run --file XXXX.py

• Add test cases into tests folder. If there are codecov issues, please add tests cases first.

PR types

Refactoring

PR changes

Tests

Description

This small PR migrates from unittest.assertEquals to unittest.assertEqual which is deprecated from Python2.7:

DeprecationWarning: Please use assertEqual instead.

[paddle-bot]

Thanks for your contribution!

[ZHUI]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.77%. Comparing base (c309aa7) to head (42a7825).
Report is 58 commits behind head on develop.

❌ Your project status has failed because the head coverage (46.77%) is below the target coverage (58.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #10670      +/-   ##
===========================================
- Coverage    46.91%   46.77%   -0.14%     
===========================================
  Files          799      802       +3     
  Lines       132457   133646    +1189     
===========================================
+ Hits         62136    62508     +372     
- Misses       70321    71138     +817     

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