Refactoring by Leveraging Your Tests with C# & xUnit
Deep dive into the Refactor phase of TDD. Learn to spot code smells and apply refactoring techniques using real examples, while keeping tests passing to preserve functionality.
Lessons and practices
Lesson 1: Eliminating Duplicated Code: Extract Functions and Refactor Magic Numbers
Refactor Duplicated Code in the Tests
Refactor Tests using Parameterization
Extract Function: calculateItemCost
Refactor duplication between calculate functions
Refactor Magic Numbers to Constants
Lesson 2: Refactoring Long Methods with the Extract Method Technique in C#
Extract user validation logic
Extracting validation into validator classes
Extract data normalization code
Setting our sights on the DataStore
Lesson 3: Long Parameter List: Introduce Parameter Object
Streamline Parameters with a Parameter Object
Introduce a CoursePolicy parameter object
Re-order parameters for cohesion
Provide defaults for most parameters
Lesson 4: Feature Envy: Move Method Refactoring with TDD
Extract StudentGrade Logic
Refactor: MoveMethod CalculateFinalGrade
Eliminate the GradeAnalyzer
Eliminate Feature Envy from the Student
Lesson 5: Large Class: Extract Class
Extract a CartItemCollection
Extract the PriceCalculator class
Extract a DiscountCalculator class
Write Tests for Extracted Classes
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