Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

C# Unit Testing in C# Test Driven Development TDD

Stub out the Calculator class so that the code compiles, but the test cases in CalculatorTests fail as expected.

what's exactly Stub out mean?? I don't understand...this is my code: using System; public class Calculator { public double Add(double val) var double Result = 0.0; { return Result; } } And keep telling me Unexpected symbol "double" Can someone please help me. Thank you.

1 Answer

Steven Parker
Steven Parker
230,235 Points

The term "stub out" means to minimally implement the required elements for the code to compile but not necessary operate. From looking at how the class will be used, you can see that the "Calculator" class will need:

  • a constructor that takes a double argument
  • a public property named "Result"
  • a method named "Add" that takes a double argument

And the error is caused by the declaration "var double", only one of those words should be used at a time.