/**
 * Test class for Config builder pattern implementation
 */
public class ConfigTest {

    /**
     * Main method to run tests
     * @param args Command line arguments
     */
    public static void main(String[] args){
        // Test 1: Using default parameters
        System.out.println("Test 1: Using default parameters");
        Config config1 = new Config.ConfigBuilder("http://example.com")
                .build();
        System.out.println("URL: " + config1.getUrl());
        System.out.println("Encoding: " + config1.getEncoding());
        System.out.println("Max Connections: " + config1.getMaxConnections());
        System.out.println("Timeout: " + config1.getTimeout());
        System.out.println();
        
        // Test 2: Customizing all optional parameters
        System.out.println("Test 2: Customizing all optional parameters");
        Config config2 = new Config.ConfigBuilder("http://test.com")
                .setEncoding("GBK")
                .setMaxConnections(50)
                .setTimeout(5000)
                .build();
        System.out.println("URL: " + config2.getUrl());
        System.out.println("Encoding: " + config2.getEncoding());
        System.out.println("Max Connections: " + config2.getMaxConnections());
        System.out.println("Timeout: " + config2.getTimeout());
        System.out.println();
        
        // Test 3: Validating parameter checks
        System.out.println("Test 3: Parameter validation");
        try {
            new Config.ConfigBuilder("")
                    .build();
            System.out.println("Failed: Empty URL should be rejected");
        } catch (IllegalArgumentException e) {
            System.out.println("Success: Empty URL rejected - " + e.getMessage());
        }
        
        try {
            new Config.ConfigBuilder("http://example.com")
                    .setMaxConnections(-1)
                    .build();
            System.out.println("Failed: Negative max connections should be rejected");
        } catch (IllegalArgumentException e) {
            System.out.println("Success: Negative max connections rejected - " + e.getMessage());
        }
    }
}