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Refactoring by Leveraging Tests with Java & JUnit

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Details

Provider

CodeSignal
Pricing

Free Certificate
Languages

English
Certificate

Certificate Available
Duration & workload

3 hours
Sessions

On-Demand
Level

Intermediate

Found in

Part of

Test-Driven Development in Java, JUnit, and Mockito

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 Duplicated Code: Extract Functions and Refactor Magic Numbers

Refactor Duplicate Code in the Tests
Refactor Tests using Parameterization
Extract Function: calculateItemCost
Refactor Duplication between Calculate Functions
Refactor Magic Numbers to Constants

Unit 2: Refactoring Long Methods with the Extract Method Technique

Extract User Validation
Extracting Validation into Validator Classes
Extract Data Normalization
Focusing on the Data Store

Unit 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

Unit 4: Feature Envy: Move Method Refactoring with TDD

Extract StudentGrade Logic
Refactor: Move Method calculateFinalGrade
Getting rid of the GradeAnalyzer
Eliminate Feature Envy from the Student

Unit 5: Large Classes: Extract Class Refactoring

Extract a CartItemCollection
Extract a PriceCalculator Class
Refactor ShoppingCart to Use DiscountCalculator Class
Write Tests for Extracted Classes

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