Refactor deprecated unittest aliases for Python 3.11 compatibility.

[tirkarthi]

The aliases were deprecated and removed in Python 3.11 .

Ref : python/cpython#28268

assertEquals -> assertEqual

Regex to check :

rg -t py 'assertEquals|assertNotEquals|assertAlmostEquals|assertNotAlmostEquals|assertRegexpMatches|assertNotRegexpMatches|assertRaisesRegexp|failUnlessEqual|failIfEqual|failUnlessAlmostEqual|failUnless|failUnlessRaises|failIf'

[codecov-commenter]

Codecov Report

Merging #41 (0bc2220) into master (2907e1f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #41   +/-   ##
=======================================
  Coverage   90.25%   90.25%           
=======================================
  Files           3        3           
  Lines         154      154           
  Branches       26       26           
=======================================
  Hits          139      139           
  Misses         10       10           
  Partials        5        5           

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[marksweb]

Thank you for your contribution @tirkarthi