Moq SetupGet Mocking a property

Question

I m trying to mock a class  called UserInputEntity  which contains a property called ColumnNames   it does contain other properties  I ve just simplified it for the question   namespace CsvImporter Entity       public interface IUserInputEntity               List lt String gt  ColumnNames   get  set               public class UserInputEntity   IUserInputEntity               public UserInputEntity List lt String gt  columnNameInputs                        ColumnNames   columnNameInputs                     public List lt String gt  ColumnNames   get  set              I have a presenter class   namespace CsvImporter UserInterface       public interface IMainPresenterHelper                                public class MainPresenterHelper IMainPresenterHelper                                 public class MainPresenter               UserInputEntity inputs           IFileDialog  dialog          IMainForm  view          IMainPresenterHelper  helper           public MainPresenter IMainForm view  IFileDialog dialog  IMainPresenterHelper helper                         view   view               dialog   dialog               helper   helper              view ComposeCollectionOfControls    ComposeCollectionOfControls              view SelectCsvFilePath    SelectCsvFilePath              view SelectErrorLogFilePath    SelectErrorLogFilePath              view DataVerification    DataVerification                      public bool testMethod IUserInputEntity input                        if  inputs ColumnNames 0      testing                                 return true                            else                               return false                                    I ve tried the following test  where I mock the entity  try to get ColumnNames property to return a initialized List lt string gt    but it s not working        Test      public void TestMethod ReturnsTrue                 Mock lt IMainForm gt  view   new Mock lt IMainForm gt             Mock lt IFileDialog gt  dialog   new Mock lt IFileDialog gt             Mock lt IMainPresenterHelper gt  helper   new Mock lt IMainPresenterHelper gt              MainPresenter presenter   new MainPresenter view Object  dialog Object  helper Object            List lt String gt  temp   new List lt string gt             temp Add  testing             Mock lt IUserInputEntity gt  input   new Mock lt IUserInputEntity gt            Errors occur on the below line          input SetupGet x   gt  x ColumnNames  Returns temp 0             bool testing   presenter testMethod input Object           Assert AreEqual testing  true           The errors I get state that there are some invalid arguments   Argument 1 cannot be converted from string to   System Func lt System Collection Generic List lt string gt  gt    Any help would be appreciated

User · Accepted Answer

ColumnNames is a property of type List lt String gt  so when you are setting up you need to pass a List lt String gt  in the Returns call as an argument  or a func which return a List lt String gt    But with this line you are trying to return just a string  input SetupGet x   gt  x ColumnNames  Returns temp 0      which is causing the exception   Change it to return whole list   input SetupGet x   gt  x ColumnNames  Returns temp

User · Answer

But while mocking read-only properties means properties with getter method only you should declare it as virtual otherwise System NotSupportedException will be thrown because it is only supported in VB as moq internally override and create proxy when we mock anything

[c#] Moq, SetupGet, Mocking a property

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