Use factories instead of statically created objects

[codecov[bot]]

Codecov Report

Merging #1080 into master will increase coverage by 0.2%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #1080     +/-   ##
=========================================
+ Coverage   91.01%   91.21%   +0.2%     
=========================================
  Files         117      116      -1     
  Lines        2792     2845     +53     
  Branches       31       31             
=========================================
+ Hits         2541     2595     +54     
+ Misses        247      246      -1     
  Partials        4        4

Impacted Files	Coverage Δ
...ntulo/tests/views/api/organizations/test_create.py	100% <100%> (ø)	:arrow_up:
...lontulo/tests/views/api/organizations/test_read.py	100% <100%> (ø)	:arrow_up:
...lontulo/tests/views/api/organizations/test_list.py	100% <100%> (ø)	:arrow_up:
...s/volontulo/tests/views/offers/test_offers_list.py	100% <100%> (ø)	:arrow_up:
...apps/volontulo/tests/views/api/offers/test_list.py	100% <100%> (ø)	:arrow_up:
...ps/volontulo/tests/views/api/offers/test_delete.py	100% <100%> (ø)	:arrow_up:
...apps/volontulo/tests/views/api/offers/test_read.py	100% <100%> (ø)	:arrow_up:
...apps/volontulo/tests/views/api/offers/test_join.py	100% <100%> (ø)	:arrow_up:
...ps/volontulo/tests/views/api/offers/test_create.py	100% <100%> (ø)	:arrow_up:
...ps/volontulo/tests/views/api/offers/test_update.py	100% <100%> (ø)	:arrow_up:
... and 3 more

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