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CodeSignal

Refactoring by Leveraging Tests with Kotlin & JUnit

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Overview

This course focuses on the Refactor step in TDD, teaching developers to spot code smells and resolve them through refactoring. Using real-world examples, you'll identify common issues, apply refactoring techniques, and ensure functionality is preserved with existing tests.

Syllabus

  • Unit 1: Eliminating Duplicate Code and Magic Numbers with Kotlin
    • Refactoring Test Code for Maintainability in ShoppingCartTest
    • Refactor Test Cases Using Parameterized Tests in ShoppingCartTest Suite
    • Refactor the ShoppingCart to Eliminate Duplication
    • Refactor ShoppingCart to Eliminate Loop Duplication
    • Refactor ShoppingCart by Removing Magic Numbers
  • Unit 2: Refactoring Long Methods in Kotlin with Extract Method Technique
    • Refactor User Validation Logic in UserRegistrationService
    • Refactor Address Validation to AddressValidator Class
    • Refactor User Registration for Data Normalization
    • User ID Generation and Registration Service Refactoring Task
  • Unit 3: Refactoring Complex Function Signatures with Parameter Objects in Kotlin
    • Refactor to Use ScoreWeights Parameter Object
    • Parameter Object Refactoring for Exam Score Processing Task
    • Refactor and Reorder Method Parameters for Clarity and Cohesion
    • Refactoring Method with Default Parameters in Kotlin
  • Unit 4: Refactoring Feature Envy in Kotlin with the Move Method Technique
    • Refactoring Feature Envy in Kotlin Classes
    • Refactor CalculateFinalGrade Method to Student Class
    • Refactor getFailedAssignments Method in Student Class
    • Refactoring Feature Envy: Extracting StudentGradeCollection Class
  • Unit 5: Addressing Large Classes with the Extract Class Pattern in Kotlin
    • Refactoring Shopping Cart for Single Responsibility Principle
    • Enhancing ShoppingCart with PriceCalculator Refactoring
    • Refactoring ShoppingCart with DiscountCalculator in Kotlin
    • Implement Unit Tests for DiscountCalculator and PriceCalculator

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