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Breaking Dependencies to Improve Code

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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

Refactoring techniques in C#

Overview

Breaking dependencies is crucial in existing systems to make them more testable, maintainable, and extensible. By reducing coupling and isolating functionality, developers can introduce changes incrementally while minimizing risks. In this course we focus on removing coupling with interfaces and dependency injection techniques for testability.

Syllabus

Unit 1: Refactoring Tight Coupling with Interfaces

Order Processing System in Action
Class Level Fields for Better Performance
Adding New Interfaces and Applying Them
Using New Interfaces in OrderProcessor Fields

Unit 2: Dependency Injection with Constructors

Adding a Constructor to the Order Processor
Mocking Dependencies for Order Tests
Testing Failed Payments with Mocks
Testing Order Processing with Missing Products
Testing Exception Handling in Order Processing
Testing Order Totals with Different Prices

Unit 3: Dependency Injection with Methods

Optional Parameters for Dependency Injection
Mocking Dependencies for Order Processing
Testing Order Processing with Missing Customer
Testing Missing Products in Order Processing
Testing Failed Payments in Order Processing
Testing Error Handling in Order Processing

Unit 4: Removing Global State

Create Order Configuration Interface
Configuration Injection for Order Processing
Add Constructor for Custom Configuration
Mock Testing Order Processing Logic
Testing Bulk Discount Order Processing
Testing Orders Without Bulk Discounts

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