Kotlin Architecture Tests with Konture: Practical Guide
How to create structural rules that enforce module boundaries in Kotlin projects
1Importance of Architecture Tests
Architecture tests are crucial for maintaining modular structure in Kotlin projects. The Konture library automatically verifies dependency rules between project modules, helping preserve clean architecture. It's particularly valuable for growing projects that need clear boundaries.
2Test Module Setup
Creating a dedicated architecture-test module is a best practice. This approach provides project-wide visibility without adding test dependencies to production code. You can easily configure the konture-test module using Gradle Kotlin DSL.
3Basic Dependency Rule
Preventing horizontal dependencies between feature modules is a fundamental architectural rule. For example, a feature implementation module shouldn't depend on another feature implementation module. Konture makes it simple to define such rules.
4Cycle Detection
Circular dependencies in module graphs increase build times and weaken boundaries. Konture's assertNoCycles() method helps proactively detect this issue. It's an essential check for multi-module projects.
5Domain Layer Protection
You can define specific rules to keep the domain layer clean. For instance, ensuring domain classes only depend on domain packages and standard libraries helps maintain architectural integrity.
6Framework Import Restrictions
Konture allows creating rules to prevent framework dependencies (like Spring or Android) from leaking into the domain layer. These specific controls help maintain clear architectural layers.
7Repository Contracts
Ensuring repositories in the domain layer remain interfaces is important for layered architecture. Konture can automatically verify whether repository classes are properly defined as interfaces.
8Package-Based Rules
Konture's advanced package matching features let you create rules for specific package prefixes. This is particularly useful for KMP projects with different policies for commonMain, androidMain, and iosMain.
9Custom Assertions
The scopeFromPackage method enables custom validations for specific packages, allowing fine-grained architectural rules tailored to your project's unique needs.
10CI Integration
Architecture tests can be easily integrated into your CI/CD pipeline. Using a separate module allows running these tests with a single Gradle task, making them part of your build process.
11Rule Development Strategy
Start with simple rules already agreed upon by the team, then add more specific checks as the project grows. Each rule should serve a concrete purpose in maintaining your architecture.
12Benefits of Architecture Tests
Konture-powered architecture tests prevent complexity as projects scale. By enforcing clear boundaries, they reduce maintenance costs and ensure team adherence to architectural decisions. It's a critical investment for long-term project health.