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Integrating IPathWrapper into the ReallyHardToTest class
// This is an example class illustrating some common patterns
// that negatively impact testability
// In this round, we have removed the static dependency on
// System.IO.Path
public class ReallyHardToTest{
SomeModel model;
IPathWrapper pathWrapper;
public ReallyHardToTest(SomeOtherDependency otherDependency, IPathWrapper pathWrapper){
this.pathWrapper = pathWrapper;
model = new SomeModel();
public void SetFilename(string fileName){
model.Filename = pathWrapper.GetFileName(fileName);
public class SomeModel{
public string Filename{get;set;}
public class SomeOtherDependency{
public void DoSomething(){
// Just here for illustration
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