Add users model tests

[zelenyhleb]

No description provided.

[codecov]

Codecov Report

Merging #190 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #190      +/-   ##
=========================================
+ Coverage    9.57%   9.59%   +0.02%     
=========================================
  Files         518     515       -3     
  Lines       13935   13896      -39     
  Branches     1130    1130              
=========================================
  Hits         1334    1334              
+ Misses      12564   12525      -39     
  Partials       37      37              

Impacted Files	Coverage Δ
...pse/passage/loc/internal/workbench/CreateRoot.java	0.00% <0.00%> (ø)
...se/passage/loc/internal/workbench/CreateInner.java	0.00% <0.00%> (ø)
...ssage/loc/internal/workbench/CreateClassifier.java	0.00% <0.00%> (ø)
...loc/internal/workbench/i18n/WorkbenchMessages.java	0.00% <0.00%> (ø)
...oc/internal/workbench/LocDomainRegistryAccess.java	0.00% <0.00%> (ø)
...oc/internal/users/core/i18n/UsersCoreMessages.java	0.00% <0.00%> (ø)
...ternal/workbench/wizards/BaseClassifierWizard.java	0.00% <0.00%> (ø)
...ternal/workbench/wizards/RootClassifierWizard.java	0.00% <0.00%> (ø)
...ernal/workbench/wizards/InnerClassifierWizard.java	0.00% <0.00%> (ø)
...al/workbench/wizards/BaseClassifierWizardPage.java	0.00% <0.00%> (ø)
... and 11 more

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[ruspl-afed]

Thanks, @zelenyhleb