Java 10 Quality Demo

Demonstration project showcasing comprehensive code quality practices:

• 100% Test Coverage with JaCoCo
• DRY (Don't Repeat Yourself)
• KISS (Keep It Simple, Stupid)
• SOLID Principles
• BDD (Behavior-Driven Development) with Cucumber
• DSL (Domain-Specific Language) patterns

Project Status

This project follows the Codev SPIDER-SOLO methodology for context-driven development.

Current Phase: Phase 1 - Foundation ✅

Prerequisites

• Java 10+ (JDK 10 or higher)
• Maven 3.8+

Quick Start

Clone and Build

# Clone the repository
git clone <repository-url>
cd java_10

# Build the project
mvn clean install

# Run tests
mvn test

# Compile only
mvn compile

Project Structure

java_10/
├── src/
│   ├── main/
│   │   ├── java/
│   │   │   └── com/example/demo/
│   │   │       └── HelloWorld.java
│   │   └── resources/
│   └── test/
│       ├── java/
│       │   ├── com/example/demo/
│       │   │   └── HelloWorldTest.java
│       │   └── steps/              # BDD step definitions (Phase 5)
│       └── resources/
│           └── features/           # BDD feature files (Phase 5)
├── codev/
│   ├── specs/                      # Specifications
│   ├── plans/                      # Implementation plans
│   └── reviews/                    # Reviews and lessons learned
├── pom.xml
├── README.md
└── .gitignore

Running Tests

# Run all tests
mvn test

# Run tests with detailed output
mvn test -DtrimStackTrace=false

# Run specific test class
mvn test -Dtest=HelloWorldTest

# Run specific test method
mvn test -Dtest=HelloWorldTest#shouldGreetWithProvidedName

Code Quality Features (Current Implementation)

Phase 1: Foundation ✅

• Maven project structure
• Java 10 configuration
• JUnit 5 for testing
• AssertJ for fluent assertions
• Example code with comprehensive tests

Future Phases

• Phase 2: JaCoCo coverage (100% enforcement)
• Phase 3: Static analysis (Checkstyle, PMD, SpotBugs)
• Phase 4: SOLID validation (ArchUnit)
• Phase 5: BDD framework (Cucumber)
• Phase 6: DSL development
• Phase 7: CI/CD integration
• Phase 8: Documentation and training

Example Usage

HelloWorld greeter = new HelloWorld();
String greeting = greeter.greet("World");
// Returns: "Hello, World!"

Test Examples

The project includes comprehensive tests demonstrating:

• Positive test cases: Valid inputs
• Negative test cases: Invalid inputs (null, empty, blank)
• Edge cases: Single character, long names, special characters
• Parameterized tests: Multiple test cases with different data
• BDD-style naming: Clear, descriptive test names
• Fluent assertions: AssertJ DSL for readable assertions

Example test:

@Test
@DisplayName("Should greet with provided name")
void shouldGreetWithProvidedName() {
    // Given
    String name = "World";

    // When
    String result = helloWorld.greet(name);

    // Then
    assertThat(result)
        .as("Greeting should contain the name")
        .isEqualTo("Hello, World!");
}

Maven Commands Reference

# Clean build artifacts
mvn clean

# Compile source code
mvn compile

# Run tests
mvn test

# Package JAR
mvn package

# Install to local repository
mvn install

# Full clean build and install
mvn clean install

# Skip tests (not recommended!)
mvn install -DskipTests

Development Workflow

Following Codev SPIDER-SOLO protocol:

1. Specification: Define requirements in codev/specs/
2. Planning: Create implementation plan in codev/plans/
3. IDE Loop: Implement, Defend (test), Evaluate
4. Review: Document lessons learned in codev/reviews/

Code Quality Standards

DRY (Don't Repeat Yourself)

• Code duplication target: < 3%
• Reusable utilities and helpers
• Shared test fixtures and builders

KISS (Keep It Simple, Stupid)

• Cyclomatic complexity: < 10 per method
• Clear, descriptive naming
• Single responsibility per method/class

SOLID Principles

• Single Responsibility: Each class has one reason to change
• Open/Closed: Open for extension, closed for modification
• Liskov Substitution: Subtypes substitutable for base types
• Interface Segregation: No unused interface dependencies
• Dependency Inversion: Depend on abstractions

Contributing

1. Write specification in codev/specs/
2. Create implementation plan in codev/plans/
3. Implement with tests (100% coverage required)
4. Run all quality checks
5. Create pull request
6. Document review in codev/reviews/

Resources

• Codev Methodology
• Specifications
• Implementation Plans
• Quality Standards
• BDD Testing

License

[Specify your license here]

Support

For questions or issues, please refer to the project documentation in the codev/ directory.