java-testing-advanced
Original：🇺🇸 English
Translated
1 scriptsChecked / no sensitive code detected
Advanced testing - Testcontainers, contract testing, mutation testing, property-based
2installs
Added on
NPX Install
npx skill4agent add pluginagentmarketplace/custom-plugin-java java-testing-advancedTags
Translated version includes tags in frontmatterSKILL.md Content
View Translation Comparison →Java Testing Advanced Skill
Advanced testing techniques for comprehensive test coverage.
Overview
This skill covers advanced testing patterns including Testcontainers for integration testing, contract testing with Pact, mutation testing with PIT, and property-based testing.
When to Use This Skill
Use when you need to:
- Test with real databases (Testcontainers)
- Verify API contracts
- Find gaps with mutation testing
- Generate test cases automatically
Quick Reference
Testcontainers
java
@Testcontainers
@SpringBootTest
class OrderRepositoryIT {
@Container
static PostgreSQLContainer<?> postgres =
new PostgreSQLContainer<>("postgres:15")
.withDatabaseName("test")
.withUsername("test")
.withPassword("test");
@Container
static KafkaContainer kafka =
new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:7.4.0"));
@DynamicPropertySource
static void configure(DynamicPropertyRegistry registry) {
registry.add("spring.datasource.url", postgres::getJdbcUrl);
registry.add("spring.kafka.bootstrap-servers", kafka::getBootstrapServers);
}
@Test
void shouldPersistOrder() {
Order saved = repository.save(new Order("item", 100.0));
assertThat(saved.getId()).isNotNull();
}
}Contract Testing (Pact)
java
@ExtendWith(PactConsumerTestExt.class)
class UserServiceContractTest {
@Pact(consumer = "order-service", provider = "user-service")
public RequestResponsePact createPact(PactDslWithProvider builder) {
return builder
.given("user exists")
.uponReceiving("get user request")
.path("/users/1")
.method("GET")
.willRespondWith()
.status(200)
.body(new PactDslJsonBody()
.integerType("id", 1)
.stringType("name", "John"))
.toPact();
}
@Test
@PactTestFor(pactMethod = "createPact")
void testGetUser(MockServer mockServer) {
User user = client.getUser(mockServer.getUrl(), 1L);
assertThat(user.getName()).isEqualTo("John");
}
}Mutation Testing (PIT)
xml
<plugin>
<groupId>org.pitest</groupId>
<artifactId>pitest-maven</artifactId>
<version>1.15.0</version>
<configuration>
<targetClasses>
<param>com.example.service.*</param>
</targetClasses>
<mutationThreshold>80</mutationThreshold>
</configuration>
</plugin>Property-Based Testing
java
@Property
void shouldReverseListTwiceReturnsOriginal(@ForAll List<Integer> list) {
Collections.reverse(list);
Collections.reverse(list);
// Original order restored
}Testing Pyramid
/\ E2E Tests (few)
/ \ Contract Tests
/----\ Integration Tests
/------\ Unit Tests (many)Troubleshooting
| Problem | Solution |
|---|---|
| Container slow | Reuse containers |
| Port conflicts | Random ports |
| Flaky tests | Wait strategies |
Usage
Skill("java-testing-advanced")