junit5

In JUnit 5, how to run code before all tests

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This is now possible in JUnit5 by creating a custom Extension, from which you can register a shutdown hook on the root test-context. Your extension would look like this; import org.junit.jupiter.api.extension.BeforeAllCallback; import org.junit.jupiter.api.extension.ExtensionContext; import static org.junit.jupiter.api.extension.ExtensionContext.Namespace.GLOBAL; public class YourExtension implements BeforeAllCallback, ExtensionContext.Store.CloseableResource { private static boolean started = false; @Override public void beforeAll(ExtensionContext context) { … Read more

Surefire is not picking up Junit 5 tests

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The maven-surefire-plugin, as of today, does not have full support of JUnit 5. There is an open issue about adding this support in SUREFIRE-1206. As such, you need to use a custom provider. One has already been developed by the JUnit team; from the user guide, you need to add the junit-platform-surefire-provider provider and the … Read more

How to use Mockito with JUnit5

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There are different ways to use Mockito – I’ll go through them one by one. Manually Creating mocks manually with Mockito::mock works regardless of the JUnit version (or test framework for that matter). Annotation Based Using the @Mock-annotation and the corresponding call to MockitoAnnotations::initMocks to create mocks works regardless of the JUnit version (or test … Read more

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0

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Run the Gradle build with a command line argument –warning-mode=all to see what exactly the deprecated features are. It will give you a detailed description of found issues with links to the Gradle docs for instructions how to fix your build. Adding –stacktrace to that, you will also be able to pinpoint where the warning … Read more

JUnit 5: How to assert an exception is thrown?

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You can use assertThrows(), which allows you to test multiple exceptions within the same test. With support for lambdas in Java 8, this is the canonical way to test for exceptions in JUnit. Per the JUnit docs: import static org.junit.jupiter.api.Assertions.assertThrows; @Test void exceptionTesting() { MyException thrown = assertThrows( MyException.class, () -> myObject.doThing(), “Expected doThing() to … Read more

Difference between @Before, @BeforeClass, @BeforeEach and @BeforeAll

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The code marked @Before is executed before each test, while @BeforeClass runs once before the entire test fixture. If your test class has ten tests, @Before code will be executed ten times, but @BeforeClass will be executed only once. In general, you use @BeforeClass when multiple tests need to share the same computationally expensive setup … Read more