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/*
* Copyright 2002-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.test.context;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.function.Function;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEvent;
import org.springframework.core.AttributeAccessor;
import org.springframework.lang.Nullable;
import org.springframework.test.annotation.DirtiesContext.HierarchyMode;
/**
* {@code TestContext} encapsulates the context in which a test is executed,
* agnostic of the actual testing framework in use.
*
* As of Spring Framework 5.0, concrete implementations are highly encouraged
* to implement a copy constructor in order to allow the immutable state
* and attributes of a {@code TestContext} to be used as a template for additional
* contexts created for parallel test execution. The copy constructor must accept a
* single argument of the type of the concrete implementation. Any implementation
* that does not provide a copy constructor will likely fail in an environment
* that executes tests concurrently.
*
* @author Sam Brannen
* @since 2.5
* @see TestContextManager
* @see TestExecutionListener
*/
public interface TestContext extends AttributeAccessor, Serializable {
/**
* Determine if the {@linkplain ApplicationContext application context} for
* this test context is known to be available.
*
If this method returns {@code true}, a subsequent invocation of
* {@link #getApplicationContext()} should succeed.
*
The default implementation of this method always returns {@code false}.
* Custom {@code TestContext} implementations are therefore highly encouraged
* to override this method with a more meaningful implementation. Note that
* the standard {@code TestContext} implementation in Spring overrides this
* method appropriately.
* @return {@code true} if the application context has already been loaded
* @since 5.2
* @see #getApplicationContext()
*/
default boolean hasApplicationContext() {
return false;
}
/**
* Get the {@linkplain ApplicationContext application context} for this
* test context, possibly cached.
*
Implementations of this method are responsible for loading the
* application context if the corresponding context has not already been
* loaded, potentially caching the context as well.
* @return the application context (never {@code null})
* @throws IllegalStateException if an error occurs while retrieving the
* application context
* @see #hasApplicationContext()
*/
ApplicationContext getApplicationContext();
/**
* Publish the {@link ApplicationEvent} created by the given {@code eventFactory}
* to the {@linkplain ApplicationContext application context} for this
* test context.
*
The {@code ApplicationEvent} will only be published if the application
* context for this test context {@linkplain #hasApplicationContext() is available}.
* @param eventFactory factory for lazy creation of the {@code ApplicationEvent}
* @since 5.2
* @see #hasApplicationContext()
* @see #getApplicationContext()
*/
default void publishEvent(Function eventFactory) {
if (hasApplicationContext()) {
getApplicationContext().publishEvent(eventFactory.apply(this));
}
}
/**
* Get the {@linkplain Class test class} for this test context.
* @return the test class (never {@code null})
*/
Class getTestClass();
/**
* Get the current {@linkplain Object test instance} for this test context.
* Note: this is a mutable property.
* @return the current test instance (never {@code null})
* @see #updateState(Object, Method, Throwable)
*/
Object getTestInstance();
/**
* Get the current {@linkplain Method test method} for this test context.
*
Note: this is a mutable property.
* @return the current test method (never {@code null})
* @see #updateState(Object, Method, Throwable)
*/
Method getTestMethod();
/**
* Get the {@linkplain Throwable exception} that was thrown during execution
* of the {@linkplain #getTestMethod() test method}.
*
Note: this is a mutable property.
* @return the exception that was thrown, or {@code null} if no exception was thrown
* @see #updateState(Object, Method, Throwable)
*/
@Nullable
Throwable getTestException();
/**
* Call this method to signal that the {@linkplain ApplicationContext application
* context} associated with this test context is dirty and should be
* removed from the context cache.
*
Do this if a test has modified the context — for example, by
* modifying the state of a singleton bean, modifying the state of an embedded
* database, etc.
* @param hierarchyMode the context cache clearing mode to be applied if the
* context is part of a hierarchy (may be {@code null})
*/
void markApplicationContextDirty(@Nullable HierarchyMode hierarchyMode);
/**
* Update this test context to reflect the state of the currently executing test.
*
WARNING: This method should only be invoked by the
* {@link TestContextManager}.
*
Caution: concurrent invocations of this method might not be thread-safe,
* depending on the underlying implementation.
* @param testInstance the current test instance (may be {@code null})
* @param testMethod the current test method (may be {@code null})
* @param testException the exception that was thrown in the test method,
* or {@code null} if no exception was thrown
*/
void updateState(@Nullable Object testInstance, @Nullable Method testMethod, @Nullable Throwable testException);
}