What is new in JUnit5
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JUnit5 – The Next Generation of JUnit Richard Langlois P. Eng. Solutions Architect 10 août 2016
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Transcript of What is new in JUnit5
JUnit5 – The Next Generation of JUnit Richard Langlois P. Eng. Solutions Architect 10 août 2016
Why JUnit5
What is New
Demo
Migration Tips
10 août 2016
Agenda
Junit 4 is an All-in-one library
Difficult for IDEs to deal with the library.
10 août 2016
Why Junit 5
Revamped codebase with a modular architecture.
JUnit 5 = JUnit Platform + JUnit Jupiter + JUnit Vintage
Junit Platform: Defines TestEngine API for developing a testing framework that runs on the platform.
Junit Jupiter: provides TestEngine for running Junit 5 based tests on the platform.
Junit Vintage: provides TestEngine for running Junit 3 and Junit 4 based tests on the platform.
Test code depends only on the JUnit 5 API.
IDE support: As of August 2016, supported by IntelliJ IDEA 2016.2
Milestone 2 released on July 23, 2016
GA release (due late 2016).
Code samples available on GitHub (https://github.com/junit-team/junit5-samples)
10 août 2016
What is Junit 5
MODIFIEZ LE STYLE DU TITRE
Architecture
• Test code depends only on the JUnit 5 API.
• IDEs and build tools depend on the Launcher and Engine APIs and can execute tests independent of the testing framework in use.
10 août 2016
JUnit 4
Import org.junit.Test
public class JUnit4Test {
@Test
public void aJunit4TestCase() {
assertTrue(“message”, 5 > 6);
}
}
JUnit 5
Import org.junit.jupiter.api.Test
class JUnit5Test {
@Test
void aJunit5TestCase() {
assertTrue(5 > 6, “message”);
}
}
10 août 2016
JUnit 4 vs JUnit 5
New set of annotations which resides in a different package (org.junit.jupiter.api) than their JUnit 4 counterparts:
@Test: the method is a test
@TestFactory: the method is a test factory for dynamic tests
@DisplayName: declares a custom display name (class or method)
@BeforeEach: method executed before each test method
@AfterEach: method executed after each test method
@BeforeAll: method executed before all test methods
@AfterAll: method executed after all test methods
@Nested: denotes that the class is a nested, non-static test class
@Tag: declare a tag for filtering tests (class or method)
@Disabled: disable a test class or test method
@ExtendWith: register custom extensions
10 août 2016
What is New
New package org.junit.jupiter.api
Tests do not need to be public
Meta-Annotation: Allows to define our own composed annotation
Display Names with @DisplayName(“…”)
Can contain spaces, special chars, and emoji 😱
Assertions
Optional message is now the last parameter
Grouped assertions using assertAll()
expectThrows: check that method throws an exception, and returns the exception object to allow further testing.
10 août 2016
What is New (continued)
Assumptions: Skip the test execution if the assumption condition is not met.
E.g. assumeTrue, assumingThat
Disabling test with @Disabled
Tagging: used to enable/disable tests with specific tags in a build and execution
Equivalent of the Categories in JUnit 4
e.g. @Tag(“fast”).
Nested Tests: Allow expressing relationship among several group of tests.
10 août 2016
What is New (continued)
Extension Model:
New extension API that supersedes the previous @RunWith and @Rule extension mechanism
Test constructors and methods are now permitted to have parameters enabling dependency injection.
2 built-in resolvers: TestInfo: information about the current test (e.g. display name)
TestReporter: to publish additional data about the current test run
Custom ParameterResolver: Specified with @ExtendWith
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What is New (continued)
Dynamic tests:
A DynamicTest is a test case generated at runtime.
Generated at runtime by a factory method (annotated with @TestFactory).
@TestFactory method returns a Stream, Collection, Iterable or Iterator of DynamicTest instances.
10 août 2016
What is New (continued)
1. AnnotationTestDemo.java
2. MetaAnnotationDemo.java
3. BeforeAfterDemo.java
4. DisplayNameDemo.java
5. AssertionsDemo.java
6. AssumptionsDemo.java
7. DisabledClassDemo.java
8. DisabledTestDemo.java
9. TaggingDemo.java
10. NestedTestDemo.java
11. ParameterTestInfoDemo.java
12. ParameterTestReporterDemo.java
13. DynamicTestDemo.java
10 août 2016
Demo
Annotations reside in the org.junit.jupiter.api package.
Assertions reside in org.junit.jupiter.api.Assertions.
Assumptions reside in org.junit.jupiter.api.Assumptions.
@Before and @After no longer exist; use @BeforeEach and @AfterEach instead.
@BeforeClass and @AfterClass no longer exist; use @BeforeAll and @AfterAll instead.
@Ignore no longer exists: use @Disabled instead.
@Category no longer exists; use @Tag instead.
@RunWith no longer exists; superseded by @ExtendWith.
@Rule and @ClassRule no longer exist; superseded by @ExtendWith.
10 août 2016
JUnit 4 to JUnit 5 Migration Tips
Project Homepage
http://junit.org/junit5
User Guide
http://junit.org/junit5/docs/current/user-guide
Javadoc
https://junit.ci.cloudbees.com/job/JUnit5/javadoc
GitHub
https://github.com/junit-team/junit5
Sample Projects
https://github.com/junit-team/junit5-samples
https://twitter.com/JUnitTeam
Stack Overflow
http://stackoverflow.com/tags/junit5
10 août 2016
References
Questions?
Next Lunch & Learn:
Introduction to Docker, by John Okrasa
10 août 2016
Thank You !
