add brain

.brain/.agent/skills/custom-skills/GenerateTest/UnitTest.md

@@ -0,0 +1,32 @@
+---
+name: GenerateUnitTest
+description: Guide to creating isolated Unit Tests (high speed) using Mocking (Moq or NSubstitute).
+---
+
+# GenerateUnitTest Skill
+
+When a user requests a **Unit Test** for a class/method, you must adhere to the following principles to generate the test code:
+
+## Purpose
+- Test solely one class/method in isolation.
+- Completely ignore real Databases, Redis, or HTTP calls.
+- Extremely fast execution speed.
+
+## 1. For CQRS Handlers or Services
+- **Identify Dependencies:** Automatically identify the Interfaces (e.g., `IRepository`, `IUnitOfWork`, `ILogger`, `IMediator`) injected into the constructor.
+- **Create Mock Objects:** Use a Mocking library (like `Moq` or `NSubstitute`) to create fake instances of these Interfaces.
+- **Test Scenario (Arrange - Act - Assert):**
+  - **Arrange:** Provide fake data (Mock data) for the Interface methods.
+  - **Act:** Call the method being executed (e.g., `Handle()` in CQRS or Service methods).
+  - **Assert:** Check the returned result, OR verify if a Mock object's method was called the correct number of times (e.g., checking if `_repository.AddAsync()` was called), OR verify if it throws a `ValidationException` given invalid input.
+
+## 2. For Domain Entities
+- **Goal:** Verify internal business logic and calculations of the Entity.
+- **Scenario:**
+  - Initialize the Entity with specific states.
+  - Call a method that alters the state or performs a calculation (e.g., `Order.CalculateTotal()`).
+  - Verify if the modified value adheres to business rules (e.g., `Total` must equal `Price * Quantity`).
+
+## Output File Format
+- **Path:** Placed in the `tests/MyNewProjectName.UnitTests/...` project (corresponding to the tested class's root directory).
+- **File Name:** `[ClassName]Tests.cs` (e.g., `CreateOrderCommandHandlerTests.cs`).