Unit tests todoItemService

[reerden]

Issue #1

Added unittests for TodoItemService.AddItemAsync() using Entity Framework Core InMemory database.

[codecov-io]

Codecov Report

Merging #31 into develop will increase coverage by 8.36%.
The diff coverage is 40%.

@@             Coverage Diff             @@
##           develop      #31      +/-   ##
===========================================
+ Coverage    21.86%   30.23%   +8.36%     
===========================================
  Files           94       87       -7     
  Lines         3457     2550     -907     
===========================================
+ Hits           756      771      +15     
+ Misses        2701     1779     -922

Impacted Files	Coverage Δ
TodoList.Web/Data/ApplicationDbContext.cs	70% <40%> (+70%)	⬆️
TodoList.Web/Views/Home/Contact.cshtml	0% <0%> (ø)	⬆️
TodoList.Web/Startup.cs	0% <0%> (ø)	⬆️
...ta/Migrations/ApplicationDbContextModelSnapshot.cs	0% <0%> (ø)	⬆️
TodoList.Web/Views/Shared/_Layout.cshtml	0% <0%> (ø)	⬆️
TodoList.Web/Views/Todos/Home.cshtml	0% <0%> (ø)	⬆️
TodoList.Web/Views/Todos/Index.cshtml	0% <0%> (ø)	⬆️
TodoList.Web/Views/Todos/Create.cshtml	0% <0%> (ø)	⬆️
TodoList.Web/Views/Todos/Details.cshtml	0% <0%> (ø)	⬆️
TodoList.Web/Models/EditViewModel.cs	100% <0%> (ø)	⬆️
... and 16 more

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[amoraitis]

I am going to keep this PR open. I would like the whole interface in one commit.

Thanks for contributing to the project.

[reerden]

I'll try to add some more tests in this PR soon 😃

[amoraitis]

@reerden What's the status of this one? Can we please resolve this?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 40.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 30.23%. Comparing base (00e73e1) to head (e5354c7).
Report is 140 commits behind head on develop.

Files with missing lines	Patch %	Lines
TodoList.Web/Data/ApplicationDbContext.cs	40.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #31      +/-   ##
===========================================
+ Coverage    28.63%   30.23%   +1.60%     
===========================================
  Files           87       87              
  Lines         2546     2550       +4     
===========================================
+ Hits           729      771      +42     
+ Misses        1817     1779      -38     

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