InjectMock should not create a new contextual instance

- resolves quarkusio#32944
- follows up on quarkusio#32409

independent-projects/arc/processor/src/main/java/io/quarkus/arc/processor/BeanGenerator.java

@@ -315,6 +315,7 @@ Collection<Resource> generateSyntheticBean(BeanInfo bean) {
             implementGetStereotypes(bean, beanCreator, stereotypes.getFieldDescriptor());
         }
         implementGetBeanClass(bean, beanCreator);
+        implementGetImplementationClass(bean, beanCreator);
         implementGetName(bean, beanCreator);
         if (bean.isDefaultBean()) {
             implementIsDefaultBean(bean, beanCreator);
@@ -487,6 +488,7 @@ Collection<Resource> generateProducerMethodBean(BeanInfo bean, MethodInfo produc
             implementGetStereotypes(bean, beanCreator, stereotypes.getFieldDescriptor());
         }
         implementGetBeanClass(bean, beanCreator);
+        implementGetImplementationClass(bean, beanCreator);
         implementGetName(bean, beanCreator);
         if (bean.isDefaultBean()) {
             implementIsDefaultBean(bean, beanCreator);
@@ -567,6 +569,7 @@ Collection<Resource> generateProducerFieldBean(BeanInfo bean, FieldInfo producer
             implementGetStereotypes(bean, beanCreator, stereotypes.getFieldDescriptor());
         }
         implementGetBeanClass(bean, beanCreator);
+        implementGetImplementationClass(bean, beanCreator);
         implementGetName(bean, beanCreator);
         if (bean.isDefaultBean()) {
             implementIsDefaultBean(bean, beanCreator);
@@ -1989,6 +1992,12 @@ protected void implementGetBeanClass(BeanInfo bean, ClassCreator beanCreator) {
         getBeanClass.returnValue(getBeanClass.loadClass(bean.getBeanClass().toString()));
     }
 
+    protected void implementGetImplementationClass(BeanInfo bean, ClassCreator beanCreator) {
+        MethodCreator getBeanClass = beanCreator.getMethodCreator("getImplementationClass", Class.class)
+                .setModifiers(ACC_PUBLIC);
+        getBeanClass.returnValue(getBeanClass.loadClass(bean.getImplClazz()));
+    }
+
     protected void implementGetName(BeanInfo bean, ClassCreator beanCreator) {
         if (bean.getName() != null) {
             MethodCreator getName = beanCreator.getMethodCreator("getName", String.class)

independent-projects/arc/runtime/src/main/java/io/quarkus/arc/InjectableBean.java

@@ -143,6 +143,23 @@ default int getPriority() {
         return 0;
     }
 
+    /**
+     * The return value depends on the {@link #getKind()}.
+     *
+     * <ul>
+     * <li>For managed beans, interceptors, decorators and built-in beans, the bean class is returned.</li>
+     * <li>For a producer method, the class of the return type is returned.</li>
+     * <li>For a producer field, the class of the field is returned.</li>
+     * <li>For a synthetic bean, the implementation class defined by the registrar is returned.
+     * </ul>
+     *
+     * @return the implementation class
+     * @see Kind
+     */
+    default Class<?> getImplementationClass() {
+        return getBeanClass();
+    }
+
     enum Kind {
 
         CLASS,

integration-tests/injectmock/src/main/java/io/quarkus/it/mockbean/RequestScopedFoo.java

@@ -0,0 +1,25 @@
+package io.quarkus.it.mockbean;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import jakarta.annotation.PostConstruct;
+import jakarta.enterprise.context.RequestScoped;
+
+import io.quarkus.arc.Unremovable;
+
+@Unremovable
+@RequestScoped
+public class RequestScopedFoo {
+
+    static final AtomicBoolean CONSTRUCTED = new AtomicBoolean();
+
+    public String ping() {
+        return "bar";
+    }
+
+    @PostConstruct
+    void init() {
+        CONSTRUCTED.set(true);
+    }
+
+}

integration-tests/injectmock/src/test/java/io/quarkus/it/mockbean/RequestScopedFooMockTest.java

@@ -0,0 +1,25 @@
+package io.quarkus.it.mockbean;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.mockito.Mockito.when;
+
+import org.junit.jupiter.api.Test;
+
+import io.quarkus.test.junit.QuarkusTest;
+import io.quarkus.test.junit.mockito.InjectMock;
+
+@QuarkusTest
+class RequestScopedFooMockTest {
+
+    @InjectMock
+    RequestScopedFoo foo;
+
+    @Test
+    void testMock() {
+        when(foo.ping()).thenReturn("pong");
+        assertEquals("pong", foo.ping());
+        assertFalse(RequestScopedFoo.CONSTRUCTED.get());
+    }
+
+}

test-framework/junit5-mockito/src/main/java/io/quarkus/test/junit/mockito/internal/CreateMockitoMocksCallback.java

@@ -13,9 +13,7 @@
 
 import io.quarkus.arc.Arc;
 import io.quarkus.arc.ArcContainer;
-import io.quarkus.arc.ClientProxy;
 import io.quarkus.arc.InstanceHandle;
-import io.quarkus.arc.Subclass;
 import io.quarkus.test.junit.callback.QuarkusTestAfterConstructCallback;
 import io.quarkus.test.junit.mockito.InjectMock;
 
@@ -29,24 +27,25 @@ public void afterConstruct(Object testInstance) {
                 InjectMock injectMockAnnotation = field.getAnnotation(InjectMock.class);
                 if (injectMockAnnotation != null) {
                     boolean returnsDeepMocks = injectMockAnnotation.returnsDeepMocks();
-                    Object contextualReference = getContextualReference(testInstance, field, InjectMock.class);
-                    Optional<Object> result = createMockAndSetTestField(testInstance, field, contextualReference,
+                    InstanceHandle<?> beanHandle = getBeanHandle(testInstance, field, InjectMock.class);
+                    Optional<Object> result = createMockAndSetTestField(testInstance, field, beanHandle,
                             new MockConfiguration(returnsDeepMocks));
                     if (result.isPresent()) {
-                        MockitoMocksTracker.track(testInstance, result.get(), contextualReference);
+                        MockitoMocksTracker.track(testInstance, result.get(), beanHandle.get());
                     }
                 }
             }
             current = current.getSuperclass();
         }
     }
 
-    private Optional<Object> createMockAndSetTestField(Object testInstance, Field field, Object contextualReference,
+    private Optional<Object> createMockAndSetTestField(Object testInstance, Field field, InstanceHandle<?> beanHandle,
             MockConfiguration mockConfiguration) {
-        Class<?> implementationClass = getImplementationClass(contextualReference);
+        Class<?> implementationClass = beanHandle.getBean().getImplementationClass();
         Object mock;
         boolean isNew;
-        Optional<Object> currentMock = MockitoMocksTracker.currentMock(testInstance, contextualReference);
+        // Note that beanHandle.get() returns a client proxy for normal scoped beans; i.e. the contextual instance is not created
+        Optional<Object> currentMock = MockitoMocksTracker.currentMock(testInstance, beanHandle.get());
         if (currentMock.isPresent()) {
             mock = currentMock.get();
             isNew = false;
@@ -71,15 +70,7 @@ private Optional<Object> createMockAndSetTestField(Object testInstance, Field fi
         }
     }
 
-    /**
-     * Contextual reference of a normal scoped bean is a client proxy.
-     *
-     * @param testInstance
-     * @param field
-     * @param annotationType
-     * @return a contextual reference of a bean
-     */
-    static Object getContextualReference(Object testInstance, Field field, Class<? extends Annotation> annotationType) {
+    static InstanceHandle<?> getBeanHandle(Object testInstance, Field field, Class<? extends Annotation> annotationType) {
         Type fieldType = field.getGenericType();
         ArcContainer container = Arc.container();
         BeanManager beanManager = container.beanManager();
@@ -100,15 +91,7 @@ static Object getContextualReference(Object testInstance, Field field, Class<? e
                             + ". Offending field is " + field.getName() + " of test class "
                             + testInstance.getClass());
         }
-        return handle.get();
-    }
-
-    static Class<?> getImplementationClass(Object contextualReference) {
-        // Unwrap the client proxy if needed
-        Object contextualInstance = ClientProxy.unwrap(contextualReference);
-        // If the contextual instance is an intercepted subclass then mock the extended implementation class
-        return contextualInstance instanceof Subclass ? contextualInstance.getClass().getSuperclass()
-                : contextualInstance.getClass();
+        return handle;
     }
 
     static Annotation[] getQualifiers(Field fieldToMock, BeanManager beanManager) {

test-framework/junit5-mockito/src/main/java/io/quarkus/test/junit/mockito/internal/CreateMockitoSpiesCallback.java

@@ -6,6 +6,7 @@
 import org.mockito.Mockito;
 
 import io.quarkus.arc.ClientProxy;
+import io.quarkus.arc.InstanceHandle;
 import io.quarkus.test.junit.callback.QuarkusTestAfterConstructCallback;
 import io.quarkus.test.junit.mockito.InjectSpy;
 
@@ -18,22 +19,22 @@ public void afterConstruct(Object testInstance) {
             for (Field field : current.getDeclaredFields()) {
                 InjectSpy injectSpyAnnotation = field.getAnnotation(InjectSpy.class);
                 if (injectSpyAnnotation != null) {
-                    Object contextualReference = CreateMockitoMocksCallback.getContextualReference(testInstance, field,
+                    InstanceHandle<?> beanHandle = CreateMockitoMocksCallback.getBeanHandle(testInstance, field,
                             InjectSpy.class);
-                    Object spy = createSpyAndSetTestField(testInstance, field, contextualReference,
+                    Object spy = createSpyAndSetTestField(testInstance, field, beanHandle,
                             injectSpyAnnotation.delegate());
-                    MockitoMocksTracker.track(testInstance, spy, contextualReference);
+                    MockitoMocksTracker.track(testInstance, spy, beanHandle.get());
                 }
             }
             current = current.getSuperclass();
         }
     }
 
-    private Object createSpyAndSetTestField(Object testInstance, Field field, Object contextualReference, boolean delegate) {
+    private Object createSpyAndSetTestField(Object testInstance, Field field, InstanceHandle<?> beanHandle, boolean delegate) {
         Object spy;
-        Object contextualInstance = ClientProxy.unwrap(contextualReference);
+        Object contextualInstance = ClientProxy.unwrap(beanHandle.get());
         if (delegate) {
-            spy = Mockito.mock(CreateMockitoMocksCallback.getImplementationClass(contextualReference),
+            spy = Mockito.mock(beanHandle.getBean().getImplementationClass(),
                     AdditionalAnswers.delegatesTo(contextualInstance));
         } else {
             // Unwrap the client proxy if needed