ConfigReader + Properties — Environment-Specific Config

# src/test/resources/config.properties

# Application
base.url=https://testerrank.com
app.name=TesterRank Practice Portals

# Browser
browser=chrome
headless=false

# Timeouts (in seconds)
implicit.wait=5
explicit.wait=10
page.load.timeout=30

# Test Credentials (for practice portals only)
default.username=testuser
default.password=password123

# Screenshots
screenshot.on.failure=true
screenshot.dir=screenshots

# Retry
retry.count=1

# Logging
log.level=INFO

package com.testerrank.utils;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;

public class ConfigReader {

    private static Properties properties;
    private static final String DEFAULT_CONFIG =
        "src/test/resources/config.properties";

    // Load once during suite initialization
    public static void init() {
        if (properties != null) return; // Already loaded

        properties = new Properties();
        String configFile = System.getProperty(
            "config.file", DEFAULT_CONFIG);

        try (FileInputStream fis =
                new FileInputStream(configFile)) {
            properties.load(fis);
        } catch (IOException e) {
            throw new RuntimeException(
                "Cannot load config file: " + configFile, e);
        }
    }

    // Get string value: system property > config file > default
    public static String get(String key, String defaultValue) {
        // System property always wins (for CI/CD overrides)
        String sysValue = System.getProperty(key);
        if (sysValue != null) return sysValue;

        // Then check config file
        init(); // Ensure loaded
        return properties.getProperty(key, defaultValue);
    }

    public static String get(String key) {
        return get(key, null);
    }

    public static int getInt(String key, int defaultValue) {
        String value = get(key);
        if (value == null) return defaultValue;
        return Integer.parseInt(value.trim());
    }

    public static boolean getBoolean(String key,
                                      boolean defaultValue) {
        String value = get(key);
        if (value == null) return defaultValue;
        return Boolean.parseBoolean(value.trim());
    }
}

# Local development — uses config.properties defaults
mvn test

# CI staging environment — overrides via -D flags
mvn test \
  -Dbase.url=https://staging.testerrank.com \
  -Dbrowser=chrome \
  -Dheadless=true \
  -Dscreenshot.on.failure=true

# CI production smoke test
mvn test \
  -Dbase.url=https://testerrank.com \
  -Dgroups=smoke \
  -Dheadless=true

# Run with a completely different config file
mvn test -Dconfig.file=src/test/resources/config-staging.properties