Error when unit testing string was not stubbed

Question

Hi,

I'm new to unit testing and not sure why I'm getting this error any ideas..?

SIDirectoryAccessor.i: IDirectoryAccessor.Exists(string) was not stubbed

I have mocked out the classes and now I am wanting to unit test. The method I would like to unit test is below:

public bool createDirectoryStructure(out string _createDirectoryStructureMessage)
        {
            _directoryStructureCreated = (!_directoryAccessor.Exists(_settingAccessor.GetSetting<string>("TargetInstallationFolderPath")));
            
            if (_directoryStructureCreated)
            {
                _createDirectoryStructureMessage = "Creating Directory";
                _directoryAccessor.Create(_settingAccessor.GetSetting<string>("TargetInstallationFolderPath"));
                _directoryAccessor.Create(_settingAccessor.GetSetting<string>("LogFileLocation"));
                return false;
            }
            else
            {
                
                _createDirectoryStructureMessage = "Directory Exists";
                return true;
            
            }
        }

My Unit test is below:

 [TestMethod]
        public void TargetLocationFolderAlreadyCreated()
        {
            SIDirectoryAccessor dirstub = new SIDirectoryAccessor();
            SISettings setstub = new SISettings();

            InstallController controller = new InstallController(null, dirstub, null, null, setstub, null, null, null, null);

            setstub.GetSettingString<string>((settingName) => "TargetInstallationFolderPath");

            string expectedMessage = "Directory Exists";
            string actualMessage = string.Empty;

            Assert.IsTrue(controller.createDirectoryStructure(out actualMessage));
            Assert.AreEqual(expectedMessage, actualMessage);
        }

Don't understand why the error display as I have added the code below, it compiles fine but doesn't run successfully..

 setstub.GetSettingString<string>((settingName) => "TargetInstallationFolderPath");

Can someone please explain what I'm doing wrong..?

Thanks

Answer 1

had to stub out

_directoryAccessor.Exists

dirstub.ExistsString = (path) => true; 

this resolved the issue