Unit Test Example for Medium

Unit-test-example-for-medium.cs

public class AccountCreatorTest{
   private IAccountChecker _accountCheckerMock;
   private IAccountRepository _accountRepositoryMock;
   
   [TestInitialize]
   public void Initialize(){
     _accountCheckerMock = new AccountCheckerMock();
     _accountRepositoryMock = new AccountRepositoryMock();
   }
   
   private class AccountCheckerMock: IAccountChecker{
      public bool Exists(){ return true; }
   }
   
   private class AccountRepositoryMock: IAccountRepository{
      public void Create(){}
   }
   
   [TestMethod]
   [ExceptedException(typeof(InvalidUsername))]
   public void TestUsernameIsNotEmpty(){
     var accountInfo = new AccountInfo() {UserName="Test"};
     var accountCreator = new AccountCreator(_accountChecker, _accountRepository);
     accountCreator.CreateAccount(accountInfo);
   }
}