Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 65“Production-grade backends”

Integration Testing

Integration tests spin up a slice (or all) of the Spring context against real dependencies — best done with Testcontainers for Postgres, Redis, Kafka.

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Examples included

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Introduction

Integration tests spin up a slice (or all) of the Spring context against real dependencies — best done with Testcontainers for Postgres, Redis, Kafka.

Informative example

@SpringBootTest
@Testcontainers
@AutoConfigureMockMvc
class OrderApiIT {

  @Container
  static PostgreSQLContainer<?> pg = new PostgreSQLContainer<>("postgres:16");

  @DynamicPropertySource
  static void props(DynamicPropertyRegistry r) {
    r.add("spring.datasource.url", pg::getJdbcUrl);
    r.add("spring.datasource.username", pg::getUsername);
    r.add("spring.datasource.password", pg::getPassword);
  }

  @Autowired MockMvc mvc;

  @Test @WithMockUser(roles = "USER")
  void createsOrder() throws Exception {
    mvc.perform(post("/api/v1/orders")
            .contentType(APPLICATION_JSON)
            .content("""
              { "userId": 1, "items": [{"productId":10,"qty":2}], "currency":"USD" }
            """))
        .andExpect(status().isCreated())
        .andExpect(jsonPath("$.status").value("PLACED"));
  }
}

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