Adds tests for apps.get_model

[gurkanindibay]

In issues #99 and #138, we had some problems when getting tenant column, when getting class with apps.get_model Problem fixed wirh previous developments. I added a test to test the case

[codecov[bot]]

Codecov Report

Merging #152 (469f3d6) into main (d57f86f) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   98.01%   98.03%   +0.02%     
==========================================
  Files          32       33       +1     
  Lines        1006     1020      +14     
==========================================
+ Hits          986     1000      +14     
  Misses         20       20              

Impacted Files	Coverage Δ
...ngo_multitenant/tests/migrations/0024_data_load.py	100.00% <100.00%> (ø)

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[agedemenli]

there's a skipped test in the check details. As discussed offline, we'll create another issue for it. It's unrelated to this pr

[gurkanindibay]

Two questions:

• The migration reverse_func() is uncovered by tests. While that seems potentially harmless, is it typical for the other test migrations? Or do we cover them by tests in some way?
• You're adding the test after the fix. Have you verified that the test fails prior to applying the fix? (Just want to be sure it's an effective test.)

Removed reverse_func, Yes always verifying. When I'm working tests always fails, at the end I succeed to make them pass