Unit Testing with Dependency Injection

unit-test-dependency-injection.cs

public class AccountCreator{
  // Interface'ler tanımlıyoruz. Dolayısıyla kendi sınıflarımızı rahatlıkla kullanabiliriz.
  private IAccountChecker _accountChecker;
  private IAccountRepository _accountRepository;
  
  // Dependency'lerimizi constructor method vasıtasıyla enjekte ediyoruz.
  public AccountCreator(IAccountChecker accountChecker, IAccountRepository accountRepository){
    _accountChecker = accountChecker;
    _accountRepository = new accountRepository;
  }
  
  public void CreateAccount(AccountInfo accountInfo){
    if(HasAccountNumber(accountInfo)){
      throw new InvalidAccountInfo("New accounts cannot have account numbers");
    }
    if(_accountChecker.Exists(SanitizeUserName(accountInfo.UserName)){
      throw new UsernameExistsException("This username is already taken. Please use a different username");
    }
    _accountRepository.Create(GetAccountDataTransferObject(accountInfo));
  }
  
  private string SanitizeUserName(string username){
    var sanitizedUsername = username.Trim().ToLower().HtmlEncode();
  }
  
  private bool HasAccountNumber(AccountInfo accountInfo){
    return accountInfo.AccountNumber != null;
  }
  
  private AccountDTO GetAccountDataTransferObject(AccountInfo accountInfo){
    return new AccountDTO {
      FirstName = accountInfo.FirstName,
      LastName = accountInfo.LastName,
      UserName = accountInfo.UserName,
      AccountCreated = accountInfo.AccountCreated
    }
  }
}