How do you test code that uses encapsulation?

This article explains how to effectively test code that utilizes encapsulation principles in Java. Encapsulation is a fundamental concept in object-oriented programming that helps to hide the internal state and behavior of an object, exposing only what is necessary through public methods.

encapsulation, Java, testing, object-oriented programming, unit testing


        // Example of encapsulation in a Java class
        public class Account {
            private double balance;

            public Account(double initialBalance) {
                balance = initialBalance;
            }

            public void deposit(double amount) {
                if (amount > 0) {
                    balance += amount;
                }
            }

            public void withdraw(double amount) {
                if (amount > 0 && amount <= balance) {
                    balance -= amount;
                }
            }

            public double getBalance() {
                return balance;
            }
        }

        // Testing the Account class
        public class AccountTest {
            private Account account;

            @Before
            public void setUp() {
                account = new Account(100.0); // Initialize with balance of 100
            }

            @Test
            public void testDeposit() {
                account.deposit(50.0);
                assertEquals(150.0, account.getBalance(), 0.001);
            }

            @Test
            public void testWithdraw() {
                account.withdraw(30.0);
                assertEquals(70.0, account.getBalance(), 0.001);
            }

            @Test
            public void testWithdrawTooMuch() {
                account.withdraw(150.0);
                assertEquals(100.0, account.getBalance(), 0.001);
            }
        }

How do you test code that uses encapsulation?

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How do you test code that uses encapsulation?

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