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Breaking Dependencies to Improve Code

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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: Breaking Dependencies to Improve Code in C++

Understanding and Reviewing the Order Processing System
Improving Object Management in OrderProcessor
Creating Interfaces for Database and Payment Dependencies
Refactoring OrderProcessor to Use Interfaces

Unit 2: Dependency Injection in C++: Enhancing Flexibility and Testability

Implementing Dependency Injection with the Null Object Pattern
Preparing Mock Objects for OrderProcessor Tests
Testing Failed Payment Handling in Order Processing
Testing Order Processing with Missing Products
Testing Exception Handling in OrderProcessor
Testing Order Processor with Varied Product Prices

Unit 3: Method Dependency Injection in C++: Enhancing Flexibility and Testability

Add Optional Dependencies to Process Order Method
Testing Order Processing with Mock Dependencies
Testing Order Processing with Non-Existent Customer
Testing Non-Existent Product Handling in OrderProcessor
Add Test for Payment Processing Failures
Testing Exception Handling in Order Processing

Unit 4: Refactoring Global State in C++: Enhancing Modularity and Testability

Creating Order Configuration Interface and Implementation
Integrating OrderConfiguration with OrderProcessor
Add Configuration Injection Constructor to OrderProcessor
Unit Testing the OrderProcessor with GoogleMock
Testing Bulk Order Discounts with Mock Configuration
Testing Orders Below Bulk Threshold

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