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Course Summary: Mastering Unit and Integration Testing in Clean Architecture

This document summarizes the key points from the course. I highly recommend watching the full course if you have the opportunity.

Before You Get Started

  • I summarize key points from useful courses to learn and review quickly.
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Teach Me: 5 Years Old | Beginner | Intermediate | Advanced | (reset auto redirect)

Learn Differently: Analogy | Storytelling | Cheatsheet | Mindmap | Flashcards | Practical Projects | Code Examples | Common Mistakes

Check Understanding: Generate Quiz | Interview Me | Refactor Challenge | Assessment Rubric | Next Steps

1. Course Introduction – What You’ll Learn and Tools You’ll Use

Summary: Junior starts with a clear overview: you’ll build a complete Clean Architecture e-commerce demo (ABC Store) with two entities (Category & Product), implement full CQRS using MediatR, and write 55 real tests (23 unit + 32 integration) that all pass independently. Tools covered: xUnit, FluentAssertions, Moq, AutoMapper, Entity Framework Core, WebApplicationFactory for integration tests.

Example: The final test runner shows 55 green tests with 100 % pass rate – the goal is always-independent, reliable tests.

Link for More Details: Ask AI: Unit and Integration Testing Overview in Clean Architecture

2. Setting Up the Clean Architecture Solution (Layers & Dependencies)

Summary: Create a blank solution named ABCStore, add five projects: Domain, Application, Infrastructure, WebAPI, and a Common layer for shared models. Set correct project references following the onion principle (Domain → Application → Infrastructure → WebAPI). Disable nullable reference types globally for cleaner code.

Example: Application references Domain + Common; Infrastructure references Application; WebAPI only references Infrastructure – everything else is accessed indirectly.

Link for More Details: Ask AI: Clean Architecture Layer Setup in .NET

3. Domain Entities and Relationships

Summary: Define simple POCO entities in the Domain layer (Category: Id, Name, Description; Product: Id, Name, Description, Price, CategoryId + navigation property). Keep Domain completely independent – no external packages.

Example: Product has CategoryId (FK) and Category navigation; Category can optionally have ICollection<Product> Products.

Link for More Details: Ask AI: Domain Entities and Relationships in Clean Architecture

4. Request & Response Models (Common Layer)

Summary: Create single-responsibility request objects (CreateProductRequest, UpdateProductRequest, etc.) and separate response objects so the API never leaks domain models. This keeps the API surface clean and future-proof for auditing fields.

Example: CreateProductRequest has Name, Description, Price, CategoryId (no Id); ProductResponse mirrors the domain but lives in Common.

Link for More Details: Ask AI: DTOs and Request-Response Models in Clean Architecture

5. CQRS with MediatR + Global Response Wrapper

Summary: Install MediatR and AutoMapper → create commands (mutations) and queries (reads) in Application/Features → implement handlers that return a generic Response<T> wrapper with IsSuccessful, Message, Data. This gives every API response the same shape.

Example: Response<ProductResponse> → { "isSuccessful": true, "message": "Product created", "data": { ... } }

Link for More Details: Ask AI: CQRS with MediatR and Response Wrapper

6. Category CRUD with MediatR (Commands & Queries)

Summary: Full implementation of Create, Update, Delete, GetById, GetAll for Category using commands/queries + handlers + AutoMapper mapping.

Example: CreateCategoryCommandHandler maps request → Category entity → _categoryService.AddAsync → SaveChangesAsync → returns wrapped success response.

Link for More Details: Ask AI: Category CRUD Operations with MediatR

7. Product CRUD + Get Products by Category

Summary: Same pattern as Category plus an extra query GetProductsByCategoryIdQuery to filter products by category.

Example: UpdateProductCommandHandler checks if product exists → maps updated fields saves returns wrapped response or failure if not found.

Link for More Details: Ask AI: Product CRUD and Filtering Queries in MediatR

8. Infrastructure Layer – EF Core DbContext & Services

Summary: Create ApplicationDbContext with DbSet and DbSet → implement ICategoryService and IProductService in Infrastructure → register everything in DI container.

Example: ProductService.UpdateAsync finds entity by Id → updates properties → SaveChangesAsync.

Link for More Details: Ask AI: EF Core Setup in Clean Architecture Infrastructure

9. Unit Testing Handlers (xUnit + Moq + FluentAssertions)

Summary: Write tests for every handler: happy path + failure cases (null request, not-found Ids). Mock services with Moq, mock AutoMapper, assert with FluentAssertions.

Example: CreateProductCommandHandler test setups mock to assign Id = 1 → asserts response.IsSuccessful should be true and data.Id == 1.

Link for More Details: Ask AI: Unit Testing MediatR Handlers with Moq

10. Integration Testing the Full Stack

Summary: Use in-memory database or WebApplicationFactory to test the entire flow from controller → handler → EF Core. Seed data, call endpoints, assert database state.

Example: Create category via API client → query database → assert exactly one record with correct name exists.

Link for More Details: Ask AI: Integration Testing Clean Architecture ASP.NET Core

11. Minimal API Controllers + Migrations + Running the App

Summary: Create thin controllers that only forward to MediatR → register all services → add migrations → run Swagger and test real endpoints.

Example: POST /categories with JSON body returns 200 OK and wrapped response; GET /categories returns array of categories.

Link for More Details: Ask AI: Minimal Controllers with MediatR and Swagger Testing

Watch the full course here: https://www.udemy.com/course/mastering-unit-and-integration-testing-in-clean-architecture/

About the summarizer

I'm Ali Sol, a Backend Developer. Learn more: