Integration testing with spring @snow one
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This document provides an overview of integration testing strategies and techniques. It discusses the differences between unit tests and integration tests, including that integration tests involve multiple layers and dependencies like databases, files, and web services, making them slower and more fragile. It also covers best practices for integration tests such as using an in-memory database, WireMock for stubbing external services, transaction management, and strategies for cleaning up after tests.
![127 © VictorRentea.ro
a training by
WireMock.stubFor(get(urlEqualTo("/some/thing"))
.withHeader("Accept", equalTo("text/xml"))
.willReturn(aResponse()
.withStatus(200)
.withHeader("Content-Type", "application/json")
.withBody("[{"id":12, "value":"WireMock"}]")));
B) Programmatically
{
"request": {
"method": "GET",
"url": "/some/thing"
},
"response": {
"status": 200,
"body": "Hello WireMock!",
"headers": {
"Content-Type": "text/plain"
}
}
}
A) via .json config files:
Templatize content
from a .json file on disk
Record them
from real systems
http://wiremock.org/docs/running-standalone/
WireMock](https://image.slidesharecdn.com/integrationtestingwithspringsnowone-210227124400/85/Integration-testing-with-spring-snow-one-27-320.jpg)
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Integration testing with spring @snow one
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- 10. 103 © VictorRentea.ro a training by @ActiveProfile("db-mem") Toggle @Component, @Bean or @Configuration Overrides properties with application-db-mem.properties
- 11. 107 © VictorRentea.ro a training by Used to debug test dependencies Cleanup After Test +10-60 wasted seconds Spring Don't push it to Jenkins! @DirtiesContext or Manually Before
- 12. 111 © VictorRentea.ro a training by Isolated Repository Tests @SpringBootTest @RunWith(SpringRunner.class) // if on JUnit 4 public class TrainingServiceTest { @Autowired private TrainingRepo repo; @Before/@BeforeEach public void checkEmptyDatabase() { assertThat(repo.findAll()).isEmpty(); } @Test public void getAll() { ... repo.save(entity); var results = repo.search(...); assertEquals(...); } @DirtiesContext(methodMode = DirtiesContext.MethodMode.AFTER_METHOD) Safest but wastes time Use For: debugging repo.deleteAll(); ... // others.deleteAll()… // in FK order @Transactional Run each test in a Transaction, rolled back after each test. Use For: Relational DBs In Large Apps: Check that the state is clean Manual Cleanup Use For: non-transacted resources (eg files, nosql)
- 13. 112 © VictorRentea.ro a training by If every test class is @Transactional Can I still have problems? YES Intermediate COMMITs aka nested transaction @Transactional(REQUIRES_NEW)
- 14. 113 © VictorRentea.ro a training by Inserting Test Data repo.save() in @Test in @BeforeEach in superclass in @RegisterExtension (JUnit5) Insert via @Profile A Spring bean persisting data at app startup src/test/resources/data.sql (auto-inserted after src/test/resources/schema.sql creation) @Sql CascadeType.PERSIST helps A LOT !
- 15. 114 © VictorRentea.ro a training by Running SQL Scripts @Sql @Sql("data.sql") @Sql({"schema.sql", "data.sql"}) On method or class @SqlMergeMode TestClass.testMethod.sql before or after @Test in the same transaction
- 16. 115 © VictorRentea.ro a training by What DB to use in Tests in-memory H2 (create schema via Hibernate) Same DB in Local Docker (create schema via scripts) Personal Schema on Physical DB (eg. REGLISS_VICTOR) Shared Test Schema on Physical DB Legacy 500+ tables schemas For PL/SQL, native features For JPA + native standard SQL
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- 18. 117 © VictorRentea.ro a training by Assertions.* assertThat(scoreStr).isEqualTo("Game won"); assertThat(list).anyMatch(e -> e.getX() == 1); .doesNotContain(2); .containsExactlyInAnyOrder(1,2,3); .isEmpty(); assertThatThrownBy(() -> prod()) .hasMessageContaining("address"); +50 more <dependency> <groupId>org.assertj</groupId> <artifactId>assertj-core</artifactId> </dependency> +60 more Actual>Expected Expected empty but was: <list.toString()> Expressive Failure Message: Testing Collections Exceptions: assertThat(list.stream().map(...))
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- 21. 120 © VictorRentea.ro a training by @Bean @Mock
- 22. 121 © VictorRentea.ro a training by @Bean @Mock Replaces that bean with a Mockito Mock Auto-reset() after each @Test
- 23. 123 © VictorRentea.ro a training by Application Context is Reused Starting Spring is slow. Pro Tip: Maximize Reuse by test classes with the same: @ActiveProfiles @MockBean set custom properties locations= .xml config classes= .class more
- 24. 124 © VictorRentea.ro a training by Faster Spring Tests 1. Tune JVM: -ea -noverify -mx2048m -XX:TieredStopAtLevel=1 Debugging Test Context reuse: logging.level.org.springframework.test.context.cache=DEBUG 4. Reuse Contexts: reduce no of Spring Banners on Jenkins 6. Disable/Limit Auto-Configuration 2. Lazy-Load only Tested Beans: spring.main.lazy-initialization=true 3. Disable Web: @SpringBootTest(webEnvironment = NONE) https://stackoverflow.com/a/49663075 = +30 sec test run time 5. Run in parallel
- 25. 125 © VictorRentea.ro a training by Reusing Test Context @SpringBootTest @Transactional @ActiveProfiles({"db-mem", "test"}) public abstract class SpringTestBase { @MockBean protected FileRepo fileRepoMock; ... all @MockBeans ever needed } @ActiveProfiles("db-mem") public class FeedProcessorWithMockTest extends SpringTestBase { @MockBean when(fileRepoMock).then... } nothing requiring dedicated context
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- 27. 127 © VictorRentea.ro a training by WireMock.stubFor(get(urlEqualTo("/some/thing")) .withHeader("Accept", equalTo("text/xml")) .willReturn(aResponse() .withStatus(200) .withHeader("Content-Type", "application/json") .withBody("[{"id":12, "value":"WireMock"}]"))); B) Programmatically { "request": { "method": "GET", "url": "/some/thing" }, "response": { "status": 200, "body": "Hello WireMock!", "headers": { "Content-Type": "text/plain" } } } A) via .json config files: Templatize content from a .json file on disk Record them from real systems http://wiremock.org/docs/running-standalone/ WireMock
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- 29. 139 © VictorRentea.ro a training by files databases queues web services Integration Tests
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