JUSTIN BAUMGARTNER SOLSTICE JUnit 5 is launching this fall and will undoubtedly move the needle for automated testing. Simultaneously, the demands of digital continue to grow and place a greater importance on automated testing for backend systems. Join Justin Baumgartner for a discussion where he will highlight the new features of JUnit 5, including Lambda support, dynamic and parameterized tests, and advances in integration testing. Justin will demonstrate the new testing features through the lens of a conversational UX experience.

2. © 2016 Pivotal
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Automated Testing for Digital Experiences
Justin Baumgartner, Technical Senior Consultant, Solstice
With JUnit 5

3. PROPRIETARY & CONFIDENTIAL
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ABOUT ME
• My name is Justin Baumgartner
• Technical Senior Consultant at Solstice
• Replatforming and modernizing Fortune 1000 monolith
• Architect on Fortune 500 Banking iOS app

4. PROPRIETARY & CONFIDENTIAL
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AGENDA
• It’s All About the Tests
• Where we’ve been - through the lens of Java/Spring & JUnit 4
• Where we’re going - JUnit 5
• Slackbot demo

5. PROPRIETARY & CONFIDENTIAL
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IT’S ALL ABOUT THE TESTS
Tests Have Expanded
Unit Tests have grown
into Integration Tests,
Functional Tests and
System Tests
Dev & Build Tools
Tools are constantly
adding new features
for writing/running
tests
TDD & CI/CD
Modern Software
Engineering techniques
highly value automated
tests

6. 6
PROPRIETARY & CONFIDENTIAL
solstice.com
2006 - JUnit 4 introduced
2007 - First iPhone released
2014 - Java 8 released
2013 - Slack launched
2008 - first GitHub repo

7. PROPRIETARY & CONFIDENTIAL
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JUNIT 4 - THE GAPS
Any Day Now…
JUnit 4 built on Java
5, unable to make
use of modern
language features
Developer Friction
Rules, Runner
restrictions, etc.
Tight Coupling
Test Writing API
coupled with Test
Discovery &
Execution API’s

8. JUNIT 5
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PROPRIETARY & CONFIDENTIAL
solstice.com

9. PROPRIETARY & CONFIDENTIAL
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MODULARIZING JUNIT
= JUnit Platform
API for Dev & Build Tools
Test discovery and
execution
JUnit Jupiter+
Contains the developer
API’s to write tests
JUnit Vintage+
Ability to run legacy
tests (JUnit 3 & JUnit 4)
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

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LAMBDA SUPPORT
@Test
void lambaTest() {
List<Integer> numbers = Arrays.asList(1, 2, 3);
assertTrue(numbers
.stream()
.mapToInt(i -> i)
.sum() > 5, () -> "Sum should be greater than 5");
}
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

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EXTENSION MODEL
• Allows developers to hook into different test life cycle callback events via an extension
• BeforeAllCallback, BeforeEachCallback, BeforeTestExecutionCallback
• AfterTestExecutionCallback, AfterEachCallback, AfterAllCallback
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

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EXTENSION MODEL (CONT)
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

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PARAMETERS
@ExtendWith(MockedSystemExtension.class)
public class SystemTest {
@Test
public void test(final MockedSystem mockedSystem) {
final Response response = mockedSystem.target().request().get();
assertEquals(response.getStatusInfo().getFamily(), Response.Status.Family.SUCCESSFUL, () ->
"status code is not 2xx");
assertEquals(response.getHeaderString("X-Hello"), "World", () -> "header 'X-Hello' not
correct");
}
}
• Allows developers to pass parameters into tests
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

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PARAMETERS (CONT)
public class MockedSystemExtension implements ParameterResolver {
@Override
public boolean supports(final ParameterContext parameterContext, final ExtensionContext extensionContext) throws
ParameterResolutionException {
return parameterContext.getParameter().getType().isAssignableFrom(MockedSystem.class);
}
@Override
public Object resolve(final ParameterContext parameterContext, final ExtensionContext extensionContext) throws
ParameterResolutionException {
final MockedSystem mockedSystem = new MockedSystem();
return mockedSystem;
}
}
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

15. @TestFactory
default Collection<DynamicTest> dynamicTestsFromCollection() {
return Arrays.asList(
dynamicTest("1st dynamic test in test interface", () -> assertTrue(true)),
dynamicTest("2nd dynamic test in test interface", () -> assertEquals(4, 2 * 2))
);
}
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DYNAMIC TESTS
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

16. PROPRIETARY & CONFIDENTIAL
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NEW TEST CONVENTIONS
PARAMETERIZED TESTS
@ParameterizedTest
@ValueSource(ints = { 1, 2, 3 })
void testWithValueSource(int argument) {
assertNotNull(argument);
}
@RepeatedTest(10)
void repeatedTest() {
// ...
}
REPEATED TESTS
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

17. PROPRIETARY & CONFIDENTIAL
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OTHER CHANGES - DISABLING TESTS
The @Disabled annotation was added in order to disable test cases and individual tests
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

18. PROPRIETARY & CONFIDENTIAL
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OTHER CHANGES - DISPLAY NAME
The @DisplayName annotation can be used to provide better description names to your tests
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

19. PROPRIETARY & CONFIDENTIAL
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OTHER CHANGES - @TAG
@Tags have replaced @Categories in order to group and filter tests
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

20. PROPRIETARY & CONFIDENTIAL
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AND MORE!
• Nested tests
• Scenario tests
• Dynamic containers
• Java 9 compatibility
ARCHITECTURE
EXTENSIBILITY
NEW TESTS
ANNOTATIONS

21. PROPRIETARY & CONFIDENTIAL
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SLACKBOT DEMO ARCHITECTURE

22. STAY IN TOUCH
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PROPRIETARY & CONFIDENTIAL
solstice.com
Justin Baumgartner
Technical Senior Consultant
jbaumgartner@solstice.com
solstice.com
Slackbot demo: bit.ly/2r8Ctlf