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Refactoring by Leveraging Your Tests with Go & Testify

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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 Go and Testify

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 Duplicated 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 in Go

Extract user validation logic
Extracting validation into smaller functions
Extract data normalization code
Setting our sights on the DataStore

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: MoveMethod CalculateFinalGrade
Eliminate the GradeAnalyzer
Eliminate Feature Envy from the Student

Unit 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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