The document discusses refactoring code to improve structure without changing behavior. It provides an example of refactoring code to find prime numbers using various techniques like extracting methods, renaming methods, and applying the template method pattern to abstract the prime finding logic from different algorithms. Refactoring aims to simplify code structure to make it easier to understand and modify over time.

1. Refactoring: A Brief Introduction

3. An Example with NUnit #region Using using NUnit.Framework; #endregion namespace com.sds.prime { [TestFixture] public class PrimeTest { [Test] public void testMethod() { Prime prime = new Prime(); } } }

5. Run Test with NUnit plugin

7. An Example with NUnit #region Using using NUnit.Framework; #endregion namespace com.sds.prime { [TestFixture] public class PrimeTest { [Test] public void testMethod() { Prime prime = new Prime(); Assert.IsTrue(prime.getNext(1) == 1); } } }

9. Run Test with NUnit plugin

11. An Example with NUnit #region Using using NUnit.Framework; #endregion namespace com.sds.prime { [TestFixture] public class PrimeTest { [Test] public void testMethod() { Prime prime = new Prime(); Assert.IsTrue(prime.getNext(1) == 1); Assert.IsTrue(prime.getNext(2) == 2); } } }

13. Run Test with NUnit plugin

15. An Example with NUnit #region Using using NUnit.Framework; #endregion namespace com.sds.prime { [TestFixture] public class PrimeTest { [Test] public void testMethod() { Prime prime = new Prime(); Assert.IsTrue(prime.getNext(1) == 1); Assert.IsTrue(prime.getNext(2) == 2); Assert.IsTrue(prime.getNext(10) == 23); } } }

18. Run Test with NUnit plugin

22. Run Test with NUnit plugin