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Currently I am writing my first TDD application. The project is in Xamarin.Forms and tested in xUnit.

I am wondering, that maybe more experienced developers will have any comments or suggestions regarding the code or architecture, before I will continue with next View Models, to avoid corrections.

I am using also Autofac and Moq.

Test class:
https://github.com/przemyslawbak/Flashcards/blob/master/Flascards.UnitTests/ViewModels/MainPageViewModelTests.cs

public class MainPageViewModelTests
 w pliku
 

Tested View Model class:
https://github.com/przemyslawbak/Flashcards/blob/master/Flashcards/Flashcards/ViewModels/MainPageViewModel.cs

public interface IMainPageViewModel
 
 void LoadGroups();
 
 public class MainPageViewModel : ViewModelBase, IMainPageViewModel
 
 List<Phrase> oldPhrases = new List<Phrase>(); //verification for PopulateDb method;
 private Func<IPhraseEditViewModel> _phraseEditVmCreator;
 private IMainDataProvider _dataProvider;
 public string FileLocation get; set; 
 public ObservableCollection<string> Groups get; set; 
 public List<Phrase> LoadedPhrases get; set; 
 public bool PhraseEdit get; set; 
 public IPhraseEditViewModel SelectedPhraseEditViewModel get; set; 
 public MainPageViewModel(IMainDataProvider dataProvider,
 Func<IPhraseEditViewModel> phraseditVmCreator) //ctor
 
 _dataProvider = dataProvider;
 _phraseEditVmCreator = phraseditVmCreator;
 Groups = new ObservableCollection<string>();
 LoadedPhrases = new List<Phrase>();
 //commands tests
 AddPhraseCommand = new DelegateCommand(OnNewPhraseExecute);
 LoadFile = new DelegateCommand(OnLoadFileExecute);
 

 public ICommand AddPhraseCommand get; private set; 
 public ICommand LoadFile get; private set; 

 private void OnNewPhraseExecute(object obj)
 
 SelectedPhraseEditViewModel = CreateAndLoadPhraseEditViewModel(null);
 

 private IPhraseEditViewModel CreateAndLoadPhraseEditViewModel(int? phraseId)
 
 //Application.Current.MainPage.Navigation.PushAsync(new PhraseEditPage());
 var phraseEditVm = _phraseEditVmCreator();
 PhraseEdit = true;
 phraseEditVm.LoadPhrase(phraseId);
 return phraseEditVm;
 
 private async void OnLoadFileExecute(object obj)
 
 LoadedPhrases.Clear();
 FileLocation = await _dataProvider.PickUpFile();
 LoadedPhrases = LoadFromFile(FileLocation);
 PopulateDb(LoadedPhrases);
 LoadGroups();
 
 public void LoadGroups() //loads group list from the DB
 
 Groups.Clear();
 foreach (var group in _dataProvider.GetGroups())
 
 Groups.Add(group);
 
 
 public List<Phrase> LoadFromFile(string filePath)
 
 if (filePath != "")
 '))
 
 int fieldCount = csv.FieldCount;
 string[] headers = csv.GetFieldHeaders();
 for (int i = 0; i < fieldCount; i++)
 
 myPhraseMap[headers[i]] = i;
 
 while (csv.ReadNextRecord())
 
 Phrase phrase = new Phrase
 
 Name = csv[myPhraseMap["Name"]],
 Definition = csv[myPhraseMap["Definition"]],
 Category = csv[myPhraseMap["Category"]],
 Group = csv[myPhraseMap["Group"]],
 Priority = csv[myPhraseMap["Priority"]],
 Learned = false
 ;
 LoadedPhrases.Add(phrase);
 
 
 
 else
 
 LoadedPhrases.Clear();
 
 return LoadedPhrases;
 
 public void PopulateDb(List<Phrase> phrases)
 
 if (oldPhrases != phrases) //populates only if collection is new
 
 foreach (var item in phrases)
 
 _dataProvider.SavePhrase(item);
 
 oldPhrases = phrases;
 
 
 

GH repository of the project:
https://github.com/przemyslawbak/Flashcards/tree/master/Flashcards/Flashcards