org.junit.jupiter.api.BeforeEach Maven / Gradle / Ivy
/*
* Copyright 2015-2020 the original author or authors.
*
* All rights reserved. This program and the accompanying materials are
* made available under the terms of the Eclipse Public License v2.0 which
* accompanies this distribution and is available at
*
* https://www.eclipse.org/legal/epl-v20.html
*/
package org.junit.jupiter.api;
import static org.apiguardian.api.API.Status.STABLE;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.apiguardian.api.API;
/**
* {@code @BeforeEach} is used to signal that the annotated method should be
* executed before each {@code @Test},
* {@code @RepeatedTest}, {@code @ParameterizedTest}, {@code @TestFactory},
* and {@code @TestTemplate} method in the current test class.
*
* Method Signatures
*
* {@code @BeforeEach} methods must have a {@code void} return type,
* must not be {@code private}, and must not be {@code static}.
* They may optionally declare parameters to be resolved by
* {@link org.junit.jupiter.api.extension.ParameterResolver ParameterResolvers}.
*
*
Inheritance and Execution Order
*
* {@code @BeforeEach} methods are inherited from superclasses as long as
* they are not overridden. Furthermore, {@code @BeforeEach} methods from
* superclasses will be executed before {@code @BeforeEach} methods in subclasses.
*
*
Similarly, {@code @BeforeEach} methods declared as interface default
* methods are inherited as long as they are not overridden, and
* {@code @BeforeEach} default methods will be executed before {@code @BeforeEach}
* methods in the class that implements the interface.
*
*
JUnit Jupiter does not guarantee the execution order of multiple
* {@code @BeforeEach} methods that are declared within a single test class or
* test interface. While it may at times appear that these methods are invoked
* in alphabetical order, they are in fact sorted using an algorithm that is
* deterministic but intentionally non-obvious.
*
*
In addition, {@code @BeforeEach} methods are in no way linked to
* {@code @AfterEach} methods. Consequently, there are no guarantees with regard
* to their wrapping behavior. For example, given two
* {@code @BeforeEach} methods {@code createA()} and {@code createB()} as well
* as two {@code @AfterEach} methods {@code destroyA()} and {@code destroyB()},
* the order in which the {@code @BeforeEach} methods are executed (e.g.
* {@code createA()} before {@code createB()}) does not imply any order for the
* seemingly corresponding {@code @AfterEach} methods. In other words,
* {@code destroyA()} might be called before or after
* {@code destroyB()}. The JUnit Team therefore recommends that developers
* declare at most one {@code @BeforeEach} method and at most one
* {@code @AfterEach} method per test class or test interface unless there are
* no dependencies between the {@code @BeforeEach} methods or between the
* {@code @AfterEach} methods.
*
*
Composition
*
* {@code @BeforeEach} may be used as a meta-annotation in order to create
* a custom composed annotation that inherits the semantics of
* {@code @BeforeEach}.
*
* @since 5.0
* @see AfterEach
* @see BeforeAll
* @see AfterAll
* @see Test
* @see RepeatedTest
* @see TestFactory
* @see TestTemplate
*/
@Target({ ElementType.ANNOTATION_TYPE, ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
@Documented
@API(status = STABLE, since = "5.0")
public @interface BeforeEach {
}