Package org.springframework.test.context.bean.override.convention

Annotation Interface TestBean

@Target(FIELD)
@Retention(RUNTIME)
@Documented
public @interface TestBean

Mark a field to override a bean definition in the BeanFactory.

By default, the bean to override is inferred from the type of the annotated field. This requires that exactly one matching definition is present in the application context. To explicitly specify a bean name to replace, set the value() or name() attribute.

The instance is created from a zero-argument static factory method in the test class whose return type is compatible with the annotated field. In the case of a nested test, any enclosing class it might have is also considered. Similarly, in case the test class inherits from a base class the whole class hierarchy is considered. The method is deduced as follows.

• If the methodName() is specified, look for a static method with that name.
• If a method name is not specified, look for exactly one static method named with a suffix equal to "TestOverride" and starting with either the name of the annotated field or the name of the bean (if specified).

Consider the following example.

 class CustomerServiceTests {

     @TestBean
     private CustomerRepository repository;

     // Tests

     private static CustomerRepository repositoryTestOverride() {
         return new TestCustomerRepository();
     }
 }

In the example above, the repository bean is replaced by the instance generated by the repositoryTestOverride() method. Not only is the overridden instance injected into the repository field, but it is also replaced in the BeanFactory so that other injection points for that bean use the overridden bean instance.

To make things more explicit, the bean and method names can be set, as shown in the following example.

 class CustomerServiceTests {

     @TestBean(name = "repository", methodName = "createTestCustomerRepository")
     private CustomerRepository repository;

     // Tests

     private static CustomerRepository createTestCustomerRepository() {
         return new TestCustomerRepository();
     }
 }

Since:

6.2

Author:

Simon Baslé, Stephane Nicoll, Sam Brannen

See Also:

• TestBeanOverrideProcessor

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
String	methodName	Name of a static factory method to look for in the test class, which will be used to instantiate the bean to override.
String	name	Name of the bean to override.
String	value	Alias for name().

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CONVENTION_SUFFIX	Required suffix for the name of a factory method that overrides a bean instance when the factory method is detected by convention.

Field Details

CONVENTION_SUFFIX

static final String CONVENTION_SUFFIX

Required suffix for the name of a factory method that overrides a bean instance when the factory method is detected by convention.

See Also:

• methodName()
• Constant Field Values

Element Details

value

@AliasFor("name")
String value

Alias for name().

Intended to be used when no other attributes are needed — for example, @TestBean("customBeanName").

See Also:

• name()

Default:

""

name

@AliasFor("value")
String name

Name of the bean to override.

If left unspecified, the bean to override is selected according to the annotated field's type.

See Also:

• value()

Default:

""

methodName

String methodName

Name of a static factory method to look for in the test class, which will be used to instantiate the bean to override.

In the case of a nested test, any enclosing class it might have is also considered. Similarly, in case the test class inherits from a base class the whole class hierarchy is considered.

If left unspecified, the name of the factory method will be detected based on convention.

See Also:

• CONVENTION_SUFFIX

Default:

""