Mikroservis Entegrasyon Testleri: Gerçek DB mi Mock mi?

1<dependency>
2<groupId>org.testcontainers</groupId>
3<artifactId>testcontainers</artifactId>
4<version>1.19.0</version>
5<scope>test</scope>
6</dependency>
7<dependency>
8<groupId>org.testcontainers</groupId>
9<artifactId>postgresql</artifactId>
10<version>1.19.0</version>
11<scope>test</scope>
12</dependency>

1import org.testcontainers.containers.PostgreSQLContainer;
2import org.junit.jupiter.api.Test;
3
4class PaymentServiceTest {
5static PostgreSQLContainer<?> postgres = new PostgreSQLContainer<>("postgres:15").withDatabaseName("testdb").withUsername("test").withPassword("test");
6
7@Test
8void testPaymentDeduction() {
9// Test başında otomatik başlar
10String jdbcUrl = postgres.getJdbcUrl();
11
12// Veritabanına bağlan
13Connection conn = DriverManager.getConnection(
14jdbcUrl, "test", "test"
15);
16
17// Kullanıcı ekle: ID=1, Bakiye=100
18conn.createStatement().execute(
19"INSERT INTO users (id, balance) VALUES (1, 100)"
20);
21
22// Ödeme servisi çağır
23PaymentService service = new PaymentService(conn);
24boolean success = service.deductBalance(1, 30);
25
26// Sonuç kontrol et
27assert success;
28
29ResultSet rs = conn.createStatement().executeQuery("SELECT balance FROM users WHERE id=1");
30rs.next();
31assert rs.getInt("balance") == 70; // 100 - 30
32}
33}

1Test başarılı.
2PostgreSQL konteyneri başlatıldı: localhost:32768
3Test bitti, konteynir silindi.