Java में Integration Testing

public class Main {
	static class Database { String read() { return "data"; } }
	static class Service {
		Database db;
		Service(Database db) { this.db = db; }
		String process() { return "Processed: " + db.read(); } // real components wired together
	}
	public static void main(String[] args) {
		Service service = new Service(new Database());
		System.out.println(service.process());
	}
}

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public class Main {
	interface Database { String read(); }
	static class FakeDatabase implements Database { public String read() { return "mocked"; } } // unit test: mock
	static class RealDatabase implements Database { public String read() { return "real data"; } } // integration: real flow
	public static void main(String[] args) {
		Database mock = new FakeDatabase();
		Database real = new RealDatabase();
		System.out.println(mock.read() + " vs " + real.read());
	}
}

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import java.util.*;
public class Main {
	static class FakeDb {
		List<String> rows = new ArrayList<>();
		void insert(String name) { rows.add(name); } // simulates a real INSERT
		List<String> selectAll() { return rows; }
	}
	public static void main(String[] args) {
		FakeDb db = new FakeDb(); // stand-in for a real, temporary test database
		db.insert("Riya");
		System.out.println(db.selectAll());
	}
}

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public class Main {
	interface ApiClient { String fetchUser(int id); }
	static class RealApiClient implements ApiClient {
		public String fetchUser(int id) { return "{\"id\":" + id + ",\"name\":\"Riya\"}"; } // realistic response shape
	}
	public static void main(String[] args) {
		ApiClient client = new RealApiClient();
		System.out.println(client.fetchUser(1));
	}
}

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import java.util.*;
public class Main {
	static List<String> testData = new ArrayList<>();
	public static void main(String[] args) {
		testData.add("temp-record"); // created in an isolated test environment
		System.out.println("Before cleanup: " + testData);
		testData.clear(); // cleaned up afterward so it doesn't pollute other tests
		System.out.println("After cleanup: " + testData);
	}
}

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