Example of a C# class with untestable dependencies

csharp-class-with-untestable-dependencies.cs

// This is an example class illustrating some common patterns
// that negatively impact testability
public class ReallyHardToTest{
  SomeModel model;
    
  public ReallyHardToTest(SomeOtherDependency otherDependency){
    model = new SomeModel();
    otherDependency.DoSomething();
  }
  
  public void SetFilename(string fileName){  
    model.Filename = Path.GetFileName(fileName);
  }
}

public class SomeModel{
  public string Filename{get;set;}
}

public class SomeOtherDependency{
  public void DoSomething(){
   // Just here for illustration 
  };
}