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Get the Most out of Testing with Spring 4.2

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Join Sam Brannen and Nicolas Fränkel to discover what's new in Spring Framework 4.2's testing support and learn tips and best practices for testing modern, Spring-based applications.

Sam Brannen is the Spring Test component lead and author of the Spring TestContext Framework, and Nicolas Fränkel is the author of the book "Integration Testing from the Trenches".

In this session, Sam and Nicolas will cover the latest testing features in Core Spring, Spring Boot, and Spring Security. In addition to new features, they will also present insider tips and best practices on integration testing with suites in TestNG, database transactions, SQL script execution, granularity of context configuration files, optimum use of the context cache, a discussion on TestNG vs. JUnit, and much more.

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Get the Most out of Testing with Spring 4.2

  1. 1. SPRINGONE2GX WASHINGTON, DC © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution -NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Get the Most out of Testing with Spring 4.2 Sam Brannen @sam_brannen Nicolas Fränkel @nicolas_frankel
  2. 2. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Sam Brannen • Spring and Enterprise Java Consultant @ Swiftmind • Java Developer for over 17 years • Spring Framework Core Committer since 2007 • Component lead for spring-test • Creator of @AliasFor • Spring Trainer • Speaker on Spring, Java, and testing • Swiss Spring User Group Lead 2
  3. 3. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ 3 Your experts for Spring and Enterprise Java Areas of expertise • Spring * • Java EE • Software Architecture • Software Engineering Best Practices Where you find us • Zurich, Switzerland • @swiftmind • http://www.swiftmind.com
  4. 4. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Nicolas Fränkel • Developer & Architect • Consultant • Teacher & Trainer • Blogger • Book Author 4
  5. 5. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Learning Vaadin 7 Integration Testing from the Trenches 5 Nicolas’ Books
  6. 6. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Agenda • Spring Events App • New in Spring 4.2 • JUnit vs. TestNG • Spring Boot Tests • Spring Security Tests • Tips & Tricks 6
  7. 7. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Show of hands… 7
  8. 8. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Spring Events App 8
  9. 9. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ The Spring Events Example Application • Spring Boot powered web app • Simple POJO domain model: Event • Transactional service layer • Spring Data JPA repository layer • Spring @MVC +Thymeleaf & REST presentation layer • Spring Security • https://github.com/sbrannen/spring-events 9
  10. 10. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ New in Spring Framework 4.2 10
  11. 11. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ @AliasFor • New in Spring Framework 4.2, refined in 4.2.1  • Used to declare aliases between attributes within an annotation • e.g., locations and value in @ContextConfiguration, or path and value in @RequestMapping • Used in composed annotations to declare explicit overrides of attributes in meta-annotations • e.g., @Get, @Post, @GetJson, @TransactionalService • See Spring Composed project for examples • https://github.com/sbrannen/spring-composed 11
  12. 12. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Composable Annotations w/ Overrides: pre 4.2 • Composable annotations can override attributes of meta-annotations • Purely convention-based • Matched by attribute name and type • Can lead to potential naming conflicts • Cannot override the value attribute 12
  13. 13. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Convention-based Attribute Override @Target(TYPE) @Retention(RUNTIME) @ContextConfiguration @Transactional public @interface TransactionalTest { String[] locations() default {}; } @TransactionalTest(locations = "/order-test-config.xml") public class OrderRepositoryTests { } 13 seen as locations in @ContextConfiguration redeclares locations attribute declares locations attribute
  14. 14. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Conflict w/ Convention-based Attribute Override @Target(TYPE) @Retention(RUNTIME) @ContextConfiguration @TestPropertySource @Transactional public @interface TransactionalTest { String[] locations() default {}; } @TransactionalTest(locations = "/order-test-config.xml") public class OrderRepositoryTests { } 14 both declare locations attribute ambiguous which one?!
  15. 15. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Composable Annotations w/ Overrides: post 4.2 • Composable annotations can explicitly override attributes of meta-annotations, even transitively • Attributes within an annotation that effectively override the same attribute are treated as implicit aliases for each other • Explicitly declared via @AliasFor • Can avoid potential naming conflicts • Can even override the value attribute 15
  16. 16. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Avoid Attribute Override Conflict w/ @AliasFor (1) @ContextConfiguration @TestPropertySource @Transactional public @interface TransactionalTest { @AliasFor(annotation = ContextConfiguration.class, attribute = "locations") String[] xmlFiles() default {}; @AliasFor(annotation = TestPropertySource.class, attribute = "locations") String[] propFiles() default {}; } 16 both declare locations attribute explicit explicit
  17. 17. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Avoid Attribute Override Conflict w/ @AliasFor (2) @TransactionalTest( xmlFiles = "/order-test-config.xml", propFiles = "/order-test.properties" ) public class OrderRepositoryTests { } 17 seen as locations in @ContextConfiguration seen as locations in @TestPropertySource
  18. 18. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Embedded Databases – What’s in a Name? Q: Why should I care what my embedded database is named? A: Because you’ll run into problems if your DataSource config is imported from multiple places within your test suite. Q: Why? Doesn’t it just create a new instance of the database? A: Recreating an embedded database within the same JVM doesn’t actually create anything: a second attempt simply connects to the existing one. Q: Ummmm… What?! A: When you connect to an embedded database, it gets created if it doesn’t already exist; otherwise, you just connect to the existing instance. Assigning each one a unique name results in different JDBC connection URLs and thus different instances. 18
  19. 19. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Unique Names for Embedded Databases 19 • EmbeddedDatabaseBuilder • setName() – since 3.0 • generateUniqueName() – since 4.2 • <jdbc:embedded-database> • id – used as name since 3.0 o but bad since the id is usually “dataSource”... i.e., not unique • database-name – since 4.2 • generate-name – since 4.2
  20. 20. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Ex: Embedded Database in Java Config 20 @Bean public DataSource dataSource() { return new EmbeddedDatabaseBuilder() .generateUniqueName(true) .addScript("schema.sql") .addScript("user_data.sql") .build(); } New in Spring 4.2
  21. 21. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Ex: Embedded Database XML Config 21 <jdbc:embedded-database id="dataSource" generate-name="true"> <jdbc:script location="classpath:/schema.sql" /> <jdbc:script location="classpath:/user_data.sql" /> </jdbc:embedded-database> New in Spring 4.2
  22. 22. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Spring Cleaning • @TransactionConfiguration • Deprecated in 4.2 • @Rollback (and @Commit) now supported at the class level • Use @Transactional qualifiers • AssertThrows • Deprecated in 3.x; gone in 4.2 • JUnit: use @Test(expected = ...) or @Rule ExpectedException • TestNG: use @Test(expectedExceptions = ...) 22
  23. 23. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Extension Points • ContextCache • Now a public API with DefaultContextCache implementation • DefaultTestContext, DefaultBootstrapContext, and DefaultCacheAwareContextLoaderDelegate • Now public classes, allowing for custom extensions • TestContextBootstrapper • Now responsible for building the TestContext 23
  24. 24. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Spring + JUnit … @Rules! • SpringJUnit4ClassRunner • Serving the community since Spring 2.5 (2007) • But… can’t be used with other runners o JUnit's Parameterized, MockitoJUnitRunner, etc. • SpringClassRule & SpringMethodRule • Since Spring 4.2 • Can be used with any JUnit runner! • Have to be used together • Provide full power of the Spring TestContext Framework 24
  25. 25. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Ex: SpringClassRule & SpringMethodRule 25 @RunWith(Parameterized.class) @ContextConfiguration public class ParameterizedSpringRuleTests { @ClassRule public static final SpringClassRule SPRING_CLASS_RULE = new SpringClassRule(); @Rule public final SpringMethodRule springMethodRule = new SpringMethodRule();
  26. 26. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ HtmlUnit, Selenium, & Geb • First-class support for HtmlUnit and Selenium in Spring MVC Test • Initially a stand-alone project • Incorporated into spring-test in Spring 4.2 • Page-based web app testing w/o a Servlet container • The Selenium support can also be used with Geb 26
  27. 27. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ MockMvc & HtmlUnit WebClient Setup • spring-test (4.2+) & htmlunit (2.18+) • MockMvcWebClientBuilder: several options, simplest case below 27 @Autowired WebApplicationContext wac; WebClient webClient; @Before public void setup() { webClient = MockMvcWebClientBuilder .webAppContextSetup(wac).build(); }
  28. 28. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ MockMvc & Selenium WebDriver Setup • spring-test (4.2+) & selenium-htmlunit-driver (2.47+) • MockMvcHtmlUnitDriverBuilder: several options, simplest case below 28 @Autowired WebApplicationContext wac; WebDriver webDriver; @Before public void setup() { webDriver = MockMvcHtmlUnitDriverBuilder .webAppContextSetup(wac).build(); }
  29. 29. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Odds & Ends (1) • ReflectionTestUtils • Now you can get or set static fields, including constants • AopTestUtils • Obtain reference to target object hidden behind one or more Spring proxies • Useful if your mock gets proxied (e.g., if your interface is @Transactional) • @DirtiesContext • New BEFORE_METHOD, BEFORE_CLASS, & BEFORE_EACH_TEST_METHOD modes • Requires DirtiesContextBeforeModesTestExecutionListener, enabled by default 29
  30. 30. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ ReflectionTestUtils vs. Proper Design • Proper design mandates that we use the most narrow visibility possible. • But it’s sometimes meaningful to test private methods, or change values of final fields, etc. • As a work-around, set the visibility to package (no keyword) and put the test class in the same package. • Guava provides the @VisibleForTesting annotation to document this hack. • ReflectionTestUtils is an alternative to such work-arounds that promotes proper design. 30
  31. 31. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Odds & Ends (2) • @Commit • Syntactical sugar for @Rollback(false) • Inlined statements with @Sql • When a dedicated SQL script is overkill • Configured via the new statements attribute • Executed after SQL scripts in same @Sql annotation • Great for one-liners • Spring MVC Test - MvcResult logging • New log(), print(OutputStream), and print(Writer) methods in MockMvcResultHandlers complement existing print() method 31
  32. 32. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ 32 @Test @Sql(statements = "DROP TABLE user IF EXISTS") @Sql( scripts = "/test-schema.sql", statements = "INSERT INTO user VALUES ('Dilbert')" ) public void userTest() { // code that uses the test schema and test user } Ex: Inlined @Sql Statements
  33. 33. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ 33 @Before public void setUpMockMvc() { mockMvc = MockMvcBuilders .webAppContextSetup(wac) .alwaysDo(print(System.err)) .build(); } Ex: Logging MvcResult to STDERR
  34. 34. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ JUnit vs TestNG 34
  35. 35. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ JUnit • De facto testing framework for Java • Most popular library in the entire Java ecosystem • http://bit.ly/1iwwboO 35
  36. 36. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ JUnit • Unit for… unit testing! • Test methods are independent and isolated • Simplicity can be both a pro and a con • Can be used for integration testing, too • Test methods are unordered • Unless you use @FixMethodOrder • Single Runner • Spring OR Mockito OR Parameterized • Rules to the rescue 36
  37. 37. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ TestNG • Implemented test annotations before JUnit • Richer lifecycle than JUnit • Ordering and grouping of test methods • Concurrent test execution 37
  38. 38. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Spring Boot Tests 38
  39. 39. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Integration Tests with Spring Boot • @SpringApplicationConfiguration • Like @ContextConfiguration but with SpringApplicationContextLoader • Fully Loaded • @IntegrationTest o IntegrationTestPropertiesListener vs. @TestPropertySource • @WebIntegrationTest • Limit scope of auto-configuration • @TestRepositoryConfig as example 39
  40. 40. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Spring Security Tests 40
  41. 41. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Spring Security Test Annotations • WithSecurityContextTestExecutionListener • auto-detected • @WithMockUser • See RestEventsControllerIT in spring-events • @WithUserDetails • @WithSecurityContext 41
  42. 42. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Spring Security & MockMvc • apply(springSecurity()) • with(...) • user(...) • authentication(...) • securityContext(...) • httpBasic(...) • perform(...) • formLogin() • logout() 42
  43. 43. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Testing Tips & Tricks 43
  44. 44. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Eclipse • Define key bindings for executing tests quickly • Alt + Shift + X… T  too awkward to type frequently! • Sam’s personal settings: o Run JUnit Test  Ctrl + J o Rerun JUnit Test  Ctrl + Shift + J • Set up content assist favorites for common static imports • org.junit.Assert OR org.assertj.core.api.Assertions • org.mockito.Mockito • org.springframework.test.web.servlet.request.MockMvcRequestBuilders • org.springframework.test.web.servlet.result.MockMvcResultMatchers 44
  45. 45. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Context Caching • Granularity of context configuration files • Goal: one entry point for production and one for testing • But… not very practical: you’ll need to support different scenarios • Too many constellations  too many contexts • Too few constellations  all tests use the same config • Optimum use of the context cache • Avoid frequent use of @DirtiesContext • Cache statistics are logged at DEBUG level for category org.springframework.test.context.cache 45
  46. 46. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Integration Tests: Spring Boot vs. Spring Core • The key differences are speed and scope • @SpringApplicationConfiguration vs. @ContextConfiguration • @EnableAutoConfiguration vs. hand-crafted test @Configuration • See @TestRepositoryConfig in spring-events app 46
  47. 47. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Scope • Think about the scope of your test • SUT: Subject Under Test • The larger the SUT, the smaller the number of tests • Mock or fake the dependencies of your SUT 47
  48. 48. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ End-to-end Testing • A few nominal scenarios • Very brittle • Use the Page pattern • Decouples the page structure from the test itself 48
  49. 49. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Integration Testing Challenges • Speed • Diagnosing the problem • Brittleness 49
  50. 50. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Speed • Integration tests are often slow • Execute unit tests before integration tests • No need to run integration tests if unit tests fail • Separate unit and integration tests in the build • Maven: use the maven-failsafe-plugin • Gradle: configure dependent Test tasks o See spring-events for an example 50
  51. 51. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Diagnosing the Problem • Consider an e-commerce checkout process • Multi-step use case • Many places where things can go wrong • Use small, focused, and aptly named methods • Order and group methods • According to the steps in the process • Easy with TestNG; possible with JUnit 51
  52. 52. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Brittleness • All applications have infrastructure dependencies • Database, web services, file system, time, etc. • External dependencies might be unavailable during testing • Sends a bad signal to developers • Causes builds to fail intermittently • Solution: approximate the production environment • Mock or fake external dependencies 52
  53. 53. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Developer & Test Databases • Embedded databases • HSQL, H2, Derby • in-memory or persistent mode • H2 supports compatibility modes for Oracle, MySQL, etc. • Developer databases • Use a single schema per developer if possible • Be aware of the mismatch if you’re not using the same RDBMS in tests as in production 53
  54. 54. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Fake Remote Web Services with SoapUI & Spark • SOAP • SoapUI has an API • REST • Spark 54 setPort(5678); get("/hello", (request, response) -> { return "Hello World!"; });
  55. 55. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Mock Remote Web Services with Spring • In-memory mocks for remote Web Service endpoints • Don’t actually connect to a server over the network • SOAP – Spring Web Services • spring-ws-test module • MockWebServiceServer • REST – Spring MVC REST • spring-test module • MockRestServiceServer 55
  56. 56. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ DataSource pool exhaustion check • Set the maximum number of connections in the pool to 1 • Tests blow up fast if connections are not returned to pool 56
  57. 57. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Checking the database when a test fails If a database related test is failing… • Commit your transactions in your tests • Via @Commit or the TestTransaction API • Use a clean setup strategy • Instead of a clean tear down strategy • Use a file based database • Use persistent storage mode for embedded DBs • Inspect database state after failed test 57
  58. 58. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Testing is about Saving Money • Not about having more test coverage than your neighbor • Think about ROI 58
  59. 59. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ JUnit Lambda 59
  60. 60. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Give back to the project that’s given us so much! • JUnit is the de facto standard testing framework in the Java ecosystem • Last major release 10 years ago • Times have changed: Java 8, etc. • Introducing … JUnit Lambda … the crowdfunding campaign to help make the next major release of JUnit a reality • Pitch in if you can, & help spread the word! • @JUnitLambda • https://www.indiegogo.com/projects/junit-lambda 60
  61. 61. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ In closing… 61
  62. 62. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Spring Resources Spring Framework http://projects.spring.io/spring-framework Spring Guides http://spring.io/guides Spring JIRA https://jira.spring.io Spring on GitHub https://github.com/spring-projects/spring-framework Stack Overflow spring, spring-test, spring-mvc, spring-boot, spring-security, … 62
  63. 63. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ Blogs Spring Blog http://spring.io/blog Swiftmind Blog http://www.swiftmind.com/blog Nicolas Fränkel’s Blog https://blog.frankel.ch 63
  64. 64. © 2013-2015 Sam Brannen & Nicolas Fränkel and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by -nc/3.0/ 64 Sam Brannen @sam_brannen www.slideshare.net/sbrannen www.swiftmind.com Learn More. Stay Connected. @springcentral Spring.io/video Nicolas Fränkel @nicolas_frankel

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