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/*
* Copyright (c) 2006 Rogério Liesenfeld
* This file is subject to the terms of the MIT license (see LICENSE.txt).
*/
package mockit;
import java.lang.annotation.*;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
/**
* Indicates a class to be tested, with optional automatic instantiation and/or automatic injection of dependencies.
* This annotation is applicable to instance fields of a test class, and to test method parameters; alternatively, it
* can be used as a meta-annotation on a user-defined annotation which, in turn, needs to have
* {@linkplain RetentionPolicy#RUNTIME runtime} {@linkplain Retention retention} and be {@linkplain Target applicable}
* to {@linkplain ElementType#FIELD fields} and/or {@linkplain ElementType#PARAMETER parameters}.
*
* Every non-{@code final} tested field and every tested parameter is eligible for automatic instantiation and
* initialization.
* By default, automatic instantiation occurs just before a test method is executed.
* This default can be changed by specifying the {@link #availableDuringSetup} optional attribute as {@code true} in a
* tested field declaration (it is ignored if applied to a tested parameter).
* Whenever automatic creation occurs, a suitable instance of the tested class is created, initialized, and assigned to
* the tested field or passed as argument to the tested parameter when the test method gets executed.
* Available {@linkplain Injectable injectables} and other {@code @Tested} values are used, either as argument values
* for the chosen constructor of the tested class, or as values to set into injected fields of the newly-created tested
* object.
*
* For constructor injection, all constructor parameters (if any) must be satisfied with available
* tested/injectable values.
* If the tested class has a constructor annotated with the standard CDI annotation "@Inject", then it is
* the one to be used;
* otherwise, if there are multiple satisfiable constructors then the one with the most parameters and the
* widest accessibility (ie, first {@code public}, then {@code protected}, then package-private, and finally
* {@code private}) is chosen.
* The matching between injectable values and constructor parameters is done by type when there is only one
* parameter of a given type; otherwise, by type and name.
*
* Field injection is performed on all tested objects, even when it was not instantiated automatically.
* Only non-final fields are considered, between those declared in the tested class itself or in one of its
* super-classes; at this time constructor injection already occurred, so only fields which remain uninitialized are
* targeted.
* For each such target field, the value of a still unused injectable of a matching type is assigned, if any is
* available.
* When a tested object has multiple target fields of a matching type, not just the type but also the name of
* each field will be used when looking for available injectables.
* Finally, if there is no matching and available injectable value for a given target field, it is left unassigned,
* unless the target field is for a required dependency; note that all fields marked with a DI annotation
* (such as {@code @Inject}, {@code @Autowired}, etc.) indicate required dependencies by default
* (the use of "@Autowired(required = false)" is respected, if present).
*
* Tested fields/parameters whose declared type is primitive, a primitive wrapper, numeric, or an enum can use the
* {@link #value} attribute to specify an initial value from a string.
*
* Custom names specified in field annotations from Java EE ({@code @Resource(name)}, {@code @Named}) or the Spring
* framework ({@code @Qualifier}) are used when looking for a matching {@code @Injectable} or {@code @Tested} value.
* When such a name contains a {@code -} (dash) or {@code .} (dot) character, the corresponding camel-cased name is used
* instead.
*
* Whenever constructor or field injection is used, the value of each injectable goes into at most one matching
* constructor parameter or instance field of a tested class.
*
* The tested class can be {@code abstract}.
* In this case, if the tested field is left null then a subclass implementing all abstract methods is automatically
* generated and instantiated.
* The abstract method implementations are automatically mocked so that expectations can be recorded or
* verified on them.
*
* When the {@link #fullyInitialized} attribute is {@code true}, all eligible fields in the tested object will get
* initialized with a suitable instance, which itself is recursively initialized in the same way.
*
* @see Tutorial
*/
@Retention(RUNTIME)
@Target({FIELD, PARAMETER, ANNOTATION_TYPE, METHOD})
public @interface Tested
{
/**
* Specifies a literal value when the type of the tested field/parameter is {@code String}, a primitive or wrapper
* type, a number type, or an enum type.
* For a primitive/wrapper/number type, the value provided must be convertible to it.
* For an enum type, the given textual value must equal the name of one of the possible enum values.
*/
String value() default "";
/**
* Indicates that each non-{@code final} field of the tested object that is eligible for injection should be assigned
* a value, which can be an available {@linkplain Injectable @Injectable} or {@code @Tested} value of a type
* assignable to the field type, or a real (unmocked) instance of the field type.
*
* Non-eligible fields are those that have already being assigned from a constructor, or that have a primitive,
* array, annotation, or JRE type (with the exception of the types described below, which are given special
* treatment).
* Also non-eligible are any {@code static} or {@code volatile} fields, unless annotated with an injection
* annotation (one of {@code @Inject}, {@code @Resource}, {@code @Autowired}, {@code @Value}, {@code @EJB},
* {@code @PersistenceContext}, or {@code @PersistenceUnit}).
*
* For each field of a reference type that would otherwise remain {@code null}, an attempt is made to automatically
* create and recursively initialize a suitable real instance.
* For this attempt to succeed, the type of the field must either be a concrete class having a constructor that can
* be satisfied by available tested/injectable values and/or by recursively created dependencies, or a known
* interface (see below) for which a real instance can be created.
*
* Constructor injection is also supported.
* In this case, the same rules used for injected fields apply to the parameters of the constructor that gets chosen
* for automatic instantiation.
*
* Currently, the following standard types (some of which are Java EE interfaces) have special support:
*
*
* {@link java.util.logging.Logger}: a logger is automatically
* {@linkplain java.util.logging.Logger#getLogger(String) created} with the name of the tested class.
*
*
* {@link javax.sql.DataSource}: a JDBC data source is created and configured according to a matching
* {@link javax.annotation.sql.DataSourceDefinition @DataSourceDefinition} in the tested class.
*
*
* {@link javax.inject.Provider Provider<T>}: a provider which produces an instance of type {@code T} is
* injected.
*
*
* JPA interfaces {@link javax.persistence.EntityManagerFactory} and {@link javax.persistence.EntityManager}:
* created through calls to {@link javax.persistence.Persistence#createEntityManagerFactory(String)} and
* {@link javax.persistence.EntityManagerFactory#createEntityManager()}, provided a suitable
* {@code META-INF/persistence.xml} file is available in the runtime classpath.
*
*
* Servlet interfaces {@link javax.servlet.ServletContext} and {@link javax.servlet.http.HttpSession}:
* objects that emulate the servlet context and HTTP session are automatically created for use in tests.
*
*
* {@link javax.enterprise.context.Conversation}: an object that emulates a web application's conversation
* context is created.
*
*
*/
boolean fullyInitialized() default false;
/**
* Indicates whether the tested class gets instantiated and initialized before the execution of test setup
* methods (ie, those annotated as {@code @Before} or {@code @BeforeMethod}), or after them.
*
* Typically, the early creation of tested objects is useful in a test setup method, which can use them for the
* initialization of other objects.
* Another potential use is to affect the initialization of other tested objects in the same test class, during their
* creation after setup.
* Finally, objects made available during setup are also available during the execution of any tear-down methods.
*/
boolean availableDuringSetup() default false;
}