[tests] Fix, removing deprecated function for future Python release compatibility.

[MarcusSorealheis]

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

Here, I replaced all the occurrences of assertEquals with assertEqual in the test files in anticipation of its removal in future Python releases. The alias has been deprecated for sometime.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

run tests.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

@betodealmeida or someone else that works on tests.

[dpgaspar]

Extra info on this: https://docs.python.org/3/library/unittest.html#deprecated-aliases

@MarcusSorealheis while your at it, can I ask you to change assertNotEquals also? (found 2 lines)

[codecov-io]

Codecov Report

Merging #8353 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8353   +/-   ##
=======================================
  Coverage   67.57%   67.57%           
=======================================
  Files         448      448           
  Lines       22529    22529           
  Branches     2363     2363           
=======================================
  Hits        15223    15223           
  Misses       7168     7168           
  Partials      138      138

---

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[MarcusSorealheis]

thanks @dpgaspar

[MarcusSorealheis]

@dpgaspar does this LGTM?

[MarcusSorealheis]

here is where CI failed (which is unrelated to the change):

      Spec                                    Tests  Pass…  Fail…  Pend…  Skip… 
  ┌────────────────────────────────────────────────────────────────────────────┐
  │ ✖ sqllab/index.test.js            00:20      5      2      1      2      - │
  └────────────────────────────────────────────────────────────────────────────┘
    1 of 1 failed (100%)              00:20      5      2      1      2      -  
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! superset@0.999.0-dev cypress: `cypress "run" "--spec" "cypress/integration/sqllab/*" "--record" "false" "--config" "video=false"`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the superset@0.999.0-dev cypress script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2019-10-07T17_16_10_188Z-debug.log
ERROR: InvocationError for command /home/travis/build/apache/incubator-superset/superset/assets/cypress_build.sh sqllab (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   cypress-sqllab: commands failed
The command "tox" exited with 1.

[dpgaspar]

LGTM