QuarkusComponentTest: programmatic lookup improvements

- handle programmatic lookup injection points specifically: register
type arguments as tested components and consider these types in the
unused beans removal exclusion
- support programmatic lookup in test method params (`Instance<>`, `@All
List<>`)
- add "Tested components" section in the docs
- related to quarkusio#42643

docs/src/main/asciidoc/testing-components.adoc

@@ -177,6 +177,19 @@ Dependent beans injected into the fields and test method arguments are correctly
 
 NOTE: Arguments of a `@ParameterizedTest` method that are provided by an `ArgumentsProvider`, for example with `@org.junit.jupiter.params.provider.ValueArgumentsProvider`, must be annotated with `@SkipInject`. 
 
+=== Tested components
+
+The initial set of tested components is derived from the test class:
+
+1. The types of all fields annotated with `@jakarta.inject.Inject` are considered the component types.
+2. The types of test methods parameters that are not annotated with `@InjectMock`, `@SkipInject`, or `@org.mockito.Mock` are also considered the component types.
+3. If `@QuarkusComponentTest#addNestedClassesAsComponents()` is set to `true` (default) then all static nested classes declared on the test class are components too.
+
+NOTE: `@Inject Instance<T>` and `@Inject @All List<T>` injection points are handled specifically. The actual type argument is registered as a component. However, if the type argument is an interface the implementations _are not registered_ automatically. 
+
+Additional components classes can be set using `@QuarkusComponentTest#value()` or `QuarkusComponentTestExtensionBuilder#addComponentClasses()`.
+
+
 [[auto_mocking]]
 === Auto Mocking Unsatisfied Dependencies
 

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

@@ -119,7 +119,7 @@ public T get() {
         return new Guard<>(result);
     }
 
-    static <T> InstanceImpl<T> forGlobalEntrypoint(Type requiredType, Set<Annotation> requiredQualifiers) {
+    public static <T> InstanceImpl<T> forGlobalEntrypoint(Type requiredType, Set<Annotation> requiredQualifiers) {
         return new InstanceImpl<>(new CreationalContextImpl<>(null), requiredType, requiredQualifiers,
                 null, null, Collections.emptySet(), null, -1, false, true);
     }
@@ -309,7 +309,7 @@ private T getInternal() {
         return getBeanInstance(bean());
     }
 
-    void destroy() {
+    public void destroy() {
         creationalContext.release();
     }
 

test-framework/junit5-component/src/main/java/io/quarkus/test/component/QuarkusComponentTestConfiguration.java

@@ -1,14 +1,21 @@
 package io.quarkus.test.component;
 
+import java.lang.reflect.Array;
 import java.lang.reflect.Field;
+import java.lang.reflect.GenericArrayType;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.lang.reflect.Parameter;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.lang.reflect.TypeVariable;
+import java.lang.reflect.WildcardType;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.function.Consumer;
 
 import jakarta.enterprise.event.Event;
@@ -20,6 +27,7 @@
 
 import org.eclipse.microprofile.config.spi.Converter;
 import org.jboss.logging.Logger;
+import org.mockito.Mock;
 
 import io.quarkus.arc.InjectableInstance;
 import io.quarkus.arc.processor.AnnotationsTransformer;
@@ -52,14 +60,14 @@ class QuarkusComponentTestConfiguration {
             new ZoneIdConverter(),
             new LevelConverter());
 
-    static final QuarkusComponentTestConfiguration DEFAULT = new QuarkusComponentTestConfiguration(Map.of(), List.of(),
+    static final QuarkusComponentTestConfiguration DEFAULT = new QuarkusComponentTestConfiguration(Map.of(), Set.of(),
             List.of(), false, true, QuarkusComponentTestExtensionBuilder.DEFAULT_CONFIG_SOURCE_ORDINAL, List.of(),
             DEFAULT_CONVERTERS, null);
 
     private static final Logger LOG = Logger.getLogger(QuarkusComponentTestConfiguration.class);
 
     final Map<String, String> configProperties;
-    final List<Class<?>> componentClasses;
+    final Set<Class<?>> componentClasses;
     final List<MockBeanConfiguratorImpl<?>> mockConfigurators;
     final boolean useDefaultConfigProperties;
     final boolean addNestedClassesAsComponents;
@@ -68,7 +76,7 @@ class QuarkusComponentTestConfiguration {
     final List<Converter<?>> configConverters;
     final Consumer<SmallRyeConfigBuilder> configBuilderCustomizer;
 
-    QuarkusComponentTestConfiguration(Map<String, String> configProperties, List<Class<?>> componentClasses,
+    QuarkusComponentTestConfiguration(Map<String, String> configProperties, Set<Class<?>> componentClasses,
             List<MockBeanConfiguratorImpl<?>> mockConfigurators, boolean useDefaultConfigProperties,
             boolean addNestedClassesAsComponents, int configSourceOrdinal,
             List<AnnotationsTransformer> annotationsTransformers, List<Converter<?>> configConverters,
@@ -124,8 +132,18 @@ QuarkusComponentTestConfiguration update(Class<?> testClass) {
         while (current != null && current != Object.class) {
             // All fields annotated with @Inject represent component classes
             for (Field field : current.getDeclaredFields()) {
-                if (field.isAnnotationPresent(Inject.class) && !resolvesToBuiltinBean(field.getType())) {
-                    componentClasses.add(field.getType());
+                if (field.isAnnotationPresent(Inject.class)) {
+                    if (Instance.class.isAssignableFrom(field.getType())
+                            || QuarkusComponentTestExtension.isListAllInjectionPoint(field.getGenericType(),
+                                    field.getAnnotations(),
+                                    field)) {
+                        // Special handling for Instance<Foo> and @All List<Foo>
+                        componentClasses
+                                .add(getRawType(
+                                        QuarkusComponentTestExtension.getFirstActualTypeArgument(field.getGenericType())));
+                    } else if (!resolvesToBuiltinBean(field.getType())) {
+                        componentClasses.add(field.getType());
+                    }
                 }
             }
             // All static nested classes declared on the test class are components
@@ -138,17 +156,26 @@ QuarkusComponentTestConfiguration update(Class<?> testClass) {
             }
             // All params of test methods but:
             // - not covered by built-in extensions
-            // - not annotated with @InjectMock
-            // - not annotated with @SkipInject
+            // - not annotated with @InjectMock, @SkipInject, @org.mockito.Mock
             for (Method method : current.getDeclaredMethods()) {
                 if (QuarkusComponentTestExtension.isTestMethod(method)) {
                     for (Parameter param : method.getParameters()) {
                         if (QuarkusComponentTestExtension.BUILTIN_PARAMETER.test(param)
                                 || param.isAnnotationPresent(InjectMock.class)
-                                || param.isAnnotationPresent(SkipInject.class)) {
+                                || param.isAnnotationPresent(SkipInject.class)
+                                || param.isAnnotationPresent(Mock.class)) {
                             continue;
                         }
-                        componentClasses.add(param.getType());
+                        if (Instance.class.isAssignableFrom(param.getType())
+                                || QuarkusComponentTestExtension.isListAllInjectionPoint(param.getParameterizedType(),
+                                        param.getAnnotations(),
+                                        param)) {
+                            // Special handling for Instance<Foo> and @All List<Foo>
+                            componentClasses.add(getRawType(
+                                    QuarkusComponentTestExtension.getFirstActualTypeArgument(param.getParameterizedType())));
+                        } else {
+                            componentClasses.add(param.getType());
+                        }
                     }
                 }
             }
@@ -161,9 +188,8 @@ QuarkusComponentTestConfiguration update(Class<?> testClass) {
             configProperties.put(testConfigProperty.key(), testConfigProperty.value());
         }
 
-        return new QuarkusComponentTestConfiguration(Map.copyOf(configProperties), List.copyOf(componentClasses),
-                this.mockConfigurators,
-                useDefaultConfigProperties, addNestedClassesAsComponents, configSourceOrdinal,
+        return new QuarkusComponentTestConfiguration(Map.copyOf(configProperties), Set.copyOf(componentClasses),
+                this.mockConfigurators, useDefaultConfigProperties, addNestedClassesAsComponents, configSourceOrdinal,
                 List.copyOf(annotationsTransformers), List.copyOf(configConverters), configBuilderCustomizer);
     }
 
@@ -188,4 +214,43 @@ private static boolean resolvesToBuiltinBean(Class<?> rawType) {
                 || BeanManager.class.equals(rawType);
     }
 
+    @SuppressWarnings("unchecked")
+    static <T> Class<T> getRawType(Type type) {
+        if (type instanceof Class<?>) {
+            return (Class<T>) type;
+        }
+        if (type instanceof ParameterizedType) {
+            final ParameterizedType parameterizedType = (ParameterizedType) type;
+            if (parameterizedType.getRawType() instanceof Class<?>) {
+                return (Class<T>) parameterizedType.getRawType();
+            }
+        }
+        if (type instanceof TypeVariable<?>) {
+            TypeVariable<?> variable = (TypeVariable<?>) type;
+            Type[] bounds = variable.getBounds();
+            return getBound(bounds);
+        }
+        if (type instanceof WildcardType) {
+            WildcardType wildcard = (WildcardType) type;
+            return getBound(wildcard.getUpperBounds());
+        }
+        if (type instanceof GenericArrayType) {
+            GenericArrayType genericArrayType = (GenericArrayType) type;
+            Class<?> rawType = getRawType(genericArrayType.getGenericComponentType());
+            if (rawType != null) {
+                return (Class<T>) Array.newInstance(rawType, 0).getClass();
+            }
+        }
+        return null;
+    }
+
+    @SuppressWarnings("unchecked")
+    private static <T> Class<T> getBound(Type[] bounds) {
+        if (bounds.length == 0) {
+            return (Class<T>) Object.class;
+        } else {
+            return getRawType(bounds[0]);
+        }
+    }
+
 }