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MockitoExtension.java
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MockitoExtension.java
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/*
* Copyright (c) 2018 Mockito contributors
* This program is made available under the terms of the MIT License.
*/
package org.mockito.junit.jupiter;
import static org.junit.jupiter.api.extension.ExtensionContext.Namespace.create;
import static org.junit.platform.commons.support.AnnotationSupport.findAnnotation;
import java.lang.reflect.Parameter;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import org.junit.jupiter.api.extension.AfterEachCallback;
import org.junit.jupiter.api.extension.BeforeEachCallback;
import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.ExtensionContext.Namespace;
import org.junit.jupiter.api.extension.ParameterContext;
import org.junit.jupiter.api.extension.ParameterResolutionException;
import org.junit.jupiter.api.extension.ParameterResolver;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.MockitoSession;
import org.mockito.ScopedMock;
import org.mockito.internal.configuration.MockAnnotationProcessor;
import org.mockito.internal.configuration.plugins.Plugins;
import org.mockito.internal.session.MockitoSessionLoggerAdapter;
import org.mockito.junit.MockitoJUnitRunner;
import org.mockito.quality.Strictness;
/**
* Extension that initializes mocks and handles strict stubbings. This extension is the JUnit Jupiter equivalent
* of our JUnit4 {@link MockitoJUnitRunner}.
*
* Example usage:
*
* <pre class="code"><code class="java">
* <b>@ExtendWith(MockitoExtension.class)</b>
* public class ExampleTest {
*
* @Mock
* private List<Integer> list;
*
* @Test
* public void shouldDoSomething() {
* list.add(100);
* }
* }
* </code></pre>
*
* If you would like to configure the used strictness for the test class, use {@link MockitoSettings}.
*
* <pre class="code"><code class="java">
* <b>@MockitoSettings(strictness = Strictness.STRICT_STUBS)</b>
* public class ExampleTest {
*
* @Mock
* private List<Integer> list;
*
* @Test
* public void shouldDoSomething() {
* list.add(100);
* }
* }
* </code></pre>
*
* This extension also supports JUnit Jupiter's method parameters.
* Use parameters for initialization of mocks that you use only in that specific test method.
* In other words, where you would initialize local mocks in JUnit 4 by calling {@link Mockito#mock(Class)},
* use the method parameter. This is especially beneficial when initializing a mock with generics, as you no
* longer get a warning about "Unchecked assignment".
* Please refer to JUnit Jupiter's documentation to learn when method parameters are useful.
*
* <pre class="code"><code class="java">
* <b>@ExtendWith(MockitoExtension.class)</b>
* public class ExampleTest {
*
* @Mock
* private List<Integer> sharedList;
*
* @Test
* public void shouldDoSomething() {
* sharedList.add(100);
* }
*
* @Test
* public void hasLocalMockInThisTest(@Mock List<Integer> localList) {
* localList.add(100);
* sharedList.add(100);
* }
* }
* </code></pre>
*
* Lastly, the extension supports JUnit Jupiter's constructor parameters.
* This allows you to do setup work in the constructor and set
* your fields to <code>final</code>.
* Please refer to JUnit Jupiter's documentation to learn when constructor parameters are useful.
*
* <pre class="code"><code class="java">
* <b>@ExtendWith(MockitoExtension.class)</b>
* public class ExampleTest {
*
* private final List<Integer> sharedList;
*
* ExampleTest(@Mock sharedList) {
* this.sharedList = sharedList;
* }
*
* @Test
* public void shouldDoSomething() {
* sharedList.add(100);
* }
* }
* </code></pre>
*/
public class MockitoExtension implements BeforeEachCallback, AfterEachCallback, ParameterResolver {
private final static Namespace MOCKITO = create("org.mockito");
private final static String SESSION = "session", MOCKS = "mocks";
private final Strictness strictness;
// This constructor is invoked by JUnit Jupiter via reflection or ServiceLoader
@SuppressWarnings("unused")
public MockitoExtension() {
this(Strictness.STRICT_STUBS);
}
private MockitoExtension(Strictness strictness) {
this.strictness = strictness;
}
/**
* Callback that is invoked <em>before</em> each test is invoked.
*
* @param context the current extension context; never {@code null}
*/
@Override
public void beforeEach(final ExtensionContext context) {
List<Object> testInstances = context.getRequiredTestInstances().getAllInstances();
Strictness actualStrictness = this.retrieveAnnotationFromTestClasses(context)
.map(MockitoSettings::strictness)
.orElse(strictness);
MockitoSession session = Mockito.mockitoSession()
.initMocks(testInstances.toArray())
.strictness(actualStrictness)
.logger(new MockitoSessionLoggerAdapter(Plugins.getMockitoLogger()))
.startMocking();
context.getStore(MOCKITO).put(MOCKS, new HashSet<>());
context.getStore(MOCKITO).put(SESSION, session);
}
private Optional<MockitoSettings> retrieveAnnotationFromTestClasses(final ExtensionContext context) {
ExtensionContext currentContext = context;
Optional<MockitoSettings> annotation;
do {
annotation = findAnnotation(currentContext.getElement(), MockitoSettings.class);
if (!currentContext.getParent().isPresent()) {
break;
}
currentContext = currentContext.getParent().get();
} while (!annotation.isPresent() && currentContext != context.getRoot());
return annotation;
}
/**
* Callback that is invoked <em>after</em> each test has been invoked.
*
* @param context the current extension context; never {@code null}
*/
@Override
@SuppressWarnings("unchecked")
public void afterEach(ExtensionContext context) {
context.getStore(MOCKITO).remove(MOCKS, Set.class).forEach(mock -> ((ScopedMock) mock).closeOnDemand());
context.getStore(MOCKITO).remove(SESSION, MockitoSession.class)
.finishMocking(context.getExecutionException().orElse(null));
}
@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext context) throws ParameterResolutionException {
return parameterContext.isAnnotated(Mock.class);
}
@Override
@SuppressWarnings("unchecked")
public Object resolveParameter(ParameterContext parameterContext, ExtensionContext context) throws ParameterResolutionException {
final Parameter parameter = parameterContext.getParameter();
Object mock = MockAnnotationProcessor.processAnnotationForMock(
parameterContext.findAnnotation(Mock.class).get(),
parameter.getType(),
parameter::getParameterizedType,
parameter.getName());
if (mock instanceof ScopedMock) {
context.getStore(MOCKITO).get(MOCKS, Set.class).add(mock);
}
return mock;
}
}