jaxwsdemo/TEST_GUIDE.md

# Unit Testing Guide

This guide explains how to run and write unit tests for the JAX-WS Hello World Service project.

## Quick Start

### Run Tests with Docker (Recommended)

#### Windows
```cmd
run-tests.bat
```

#### Linux/Mac
```bash
./run-tests.sh
```

### Run Tests with Maven (Local)

If you have Maven installed locally:

```bash
mvn test
```

## Test Results Summary

### Current Test Coverage

| Service | Test Class | Test Cases | Status |
|---------|-----------|------------|--------|
| Hello World Service | HelloWorldServiceImplTest | 10 | ✅ Passing |

### Test Case Details

The `HelloWorldServiceImplTest` includes the following test cases:

1. **testGetHelloWorld_WithValidName** - Verifies greeting with valid name
2. **testGetHelloWorld_WithEmptyString** - Handles empty string input
3. **testGetHelloWorld_WithNull** - Handles null input gracefully
4. **testGetHelloWorld_WithSpecialCharacters** - Handles special characters
5. **testGetHelloWorld_WithSpaces** - Handles names with spaces
6. **testGetHelloWorld_WithLongName** - Handles long names
7. **testGetHelloWorld_ReturnsNonNull** - Ensures non-null response
8. **testGetHelloWorld_StartsWithHelloWorld** - Verifies message format
9. **testGetHelloWorld_EndsWithExclamation** - Verifies message ending
10. **testGetHelloWorld_ContainsName** - Verifies name inclusion

## Docker Test Configuration

### Test Architecture

The project uses a multi-stage Dockerfile:

- **Stage 1 (tester)**: Runs unit tests
- **Stage 2 (builder)**: Builds the WAR file
- **Stage 3**: Deploys to Tomcat

### Test Docker Compose

The `docker-compose.test.yml` file is configured to:
- Target the `tester` stage of the Dockerfile
- Mount source code for live testing
- Cache Maven dependencies for faster subsequent runs
- Set appropriate memory limits

### Run Tests Manually

```bash
# Build and run tests
docker-compose -f docker-compose.test.yml up --build

# Clean up after tests
docker-compose -f docker-compose.test.yml down
```

## Testing Framework

### Dependencies

The project uses:

- **JUnit 5 (Jupiter)** - Testing framework
  - `junit-jupiter-api:5.9.3` - Test annotations and assertions
  - `junit-jupiter-engine:5.9.3` - Test execution engine

- **Mockito** - Mocking framework (for future complex tests)
  - `mockito-core:5.3.1` - Core mocking functionality
  - `mockito-junit-jupiter:5.3.1` - JUnit 5 integration

- **Maven Surefire** - Test runner plugin
  - Configured to run all `*Test.java` files

## Writing New Tests

### Test Structure

Tests follow the standard JUnit 5 structure:

```java
package com.example.service;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.DisplayName;

import static org.junit.jupiter.api.Assertions.*;

@DisplayName("Service Tests")
class YourServiceTest {

    private YourService service;

    @BeforeEach
    void setUp() {
        service = new YourServiceImpl();
    }

    @Test
    @DisplayName("Should do something")
    void testSomething() {
        // Arrange
        String input = "test";
        String expected = "expected result";

        // Act
        String result = service.doSomething(input);

        // Assert
        assertEquals(expected, result);
    }
}
```

### Test Best Practices

1. **Use Descriptive Names**: Use `@DisplayName` for readable test descriptions
2. **Follow AAA Pattern**: Arrange, Act, Assert
3. **Test Edge Cases**: Include null, empty, and boundary conditions
4. **Keep Tests Isolated**: Each test should be independent
5. **Test One Thing**: Each test should verify one specific behavior

### Adding Tests for New Services

To add tests for other services (e.g., LoanApprovalService):

1. Create test class in `src/test/java/com/example/service/`
2. Follow the naming convention: `{ServiceName}Test.java`
3. Run tests to verify

Example structure for LoanApprovalService tests:

```java
package com.example.service;

import com.example.model.*;
import com.example.repository.*;
import org.junit.jupiter.api.*;
import org.mockito.*;

import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.Mockito.*;

@DisplayName("LoanApprovalService Tests")
class LoanApprovalServiceTest {

    @Mock
    private CustomerRepository customerRepository;

    @Mock
    private CreditScoreService creditScoreService;

    private LoanApprovalService service;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        service = new LoanApprovalService();
        // Inject mocks if needed
    }

    @Test
    @DisplayName("Should approve loan for high credit score")
    void testLoanApproval_HighCreditScore() {
        // Test implementation
    }
}
```

## Test Directory Structure

```
src/
├── main/
│   └── java/
│       └── com/
│           └── example/
│               └── service/
│                   ├── HelloWorldService.java
│                   └── HelloWorldServiceImpl.java
└── test/
    └── java/
        └── com/
            └── example/
                └── service/
                    └── HelloWorldServiceImplTest.java
```

## Continuous Integration

### Running Tests in CI/CD

The Dockerfile includes testing as the first stage, which means:

- Tests run automatically during Docker build
- Build fails if tests fail
- Ensures code quality before deployment

To run tests in CI/CD pipelines:

```bash
# Option 1: Run full build (includes tests)
docker build -t jaxws-app .

# Option 2: Run tests only
docker build --target tester -t jaxws-test .

# Option 3: Use docker-compose
docker-compose -f docker-compose.test.yml up --abort-on-container-exit
```

## Viewing Test Reports

### Console Output

Test results are displayed in the console with summary:

```
-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.example.service.HelloWorldServiceImplTest
Tests run: 10, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.024 s

Results:

Tests run: 10, Failures: 0, Errors: 0, Skipped: 0

BUILD SUCCESS
```

### Surefire Reports

Maven Surefire generates detailed reports in:
- `target/surefire-reports/` (text and XML formats)

## Troubleshooting

### Tests Not Running

**Problem**: Maven doesn't find tests

**Solution**:
- Ensure test files end with `Test.java`
- Verify test directory structure: `src/test/java/`
- Check pom.xml includes maven-surefire-plugin

### Docker Build Fails on Tests

**Problem**: Docker build fails at test stage

**Solution**:
```bash
# View detailed test output
docker build --target tester -t jaxws-test .

# Check test container logs
docker logs <container-id>
```

### Dependency Issues

**Problem**: Cannot resolve JUnit dependencies

**Solution**:
```bash
# Clear Maven cache and rebuild
docker-compose -f docker-compose.test.yml build --no-cache
```

### Permission Denied on run-tests.sh

**Problem**: Cannot execute run-tests.sh on Linux/Mac

**Solution**:
```bash
chmod +x run-tests.sh
./run-tests.sh
```

## Future Enhancements

Consider adding tests for:

1. **LoanApprovalService**
   - Customer registration workflows
   - Loan approval logic
   - Credit score evaluation
   - Blacklist handling

2. **Repository Layer**
   - Database operations
   - CRUD functionality
   - Error handling

3. **Integration Tests**
   - End-to-end SOAP request/response
   - Database integration
   - Multi-service workflows

4. **Performance Tests**
   - Load testing
   - Stress testing
   - Response time validation

## Resources

- [JUnit 5 User Guide](https://junit.org/junit5/docs/current/user-guide/)
- [Mockito Documentation](https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html)
- [Maven Surefire Plugin](https://maven.apache.org/surefire/maven-surefire-plugin/)
- [Test-Driven Development Best Practices](https://martinfowler.com/bliki/TestDrivenDevelopment.html)

## Summary

This project now has a complete unit testing setup with:

- ✅ JUnit 5 testing framework
- ✅ 10 passing test cases for HelloWorldService
- ✅ Docker-based test execution
- ✅ Convenient test runner scripts
- ✅ Multi-stage Dockerfile with test stage
- ✅ Maven Surefire configuration
- ✅ Mockito for future mocking needs

To add more tests, simply create new test classes following the established patterns and run them using the provided scripts.