```
@Retention(RUNTIME)
@Target(TYPE)
@ExtendWith(TestGuiceyAppExtension.class)
@Inherited
public @interface TestGuiceyApp
```
Guicey app junit 5 extension. Runs only guice context without starting web part (jetty and jersey). Useful for testing core business services.
Note: in spite of the fact that jersey not started, Managed objects would be started and stopped normally.
Extension may be declared on test class or on any nested class. When declared on nested class, applies to all lower nested classes (default junit 5 extension appliance behaviour). Multiple extension declarations (on multiple nested levels) is useless as junit will use only the top declared extension instance (and other will be ignored).
Guice context started before all tests (before BeforeAll) and shut down after all tests (after AfterAll). If you need to restart application between tests then declare extension in RegisterExtension non-static field instead of annotation.
Guice injections will work on test fields annotated with Inject or Inject (Injector.injectMembers(Object) applied on test instance). Guice AOP will not work on test methods (because test itself is not created by guice).
Test constructor, lifecycle and test methods may use additional parameters:
- Any declared (possibly with qualifier annotation or generified) guice bean
- For not declared beans use Jit to force JIT binding (create declared bean with guice, even if it wasn't registered)
- Specially supported objects:
  - Application or exact application class
  - ObjectMapper
  - ClientSupport for calling external urls
Internally use DropwizardTestSupport with custom command (TestCommand).
It is possible to apply extension manually using RegisterExtension and TestGuiceyAppExtension.forApp(Class) builder. For static field the behaviour would be the same as with annotation, for non-static field application will restart before each test method.
Since:

29.04.2020

Required Element Summary

Required Elements
Modifier and Type Required Element Description

java.lang.Class<? extends io.dropwizard.Application> value

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`java.lang.String`	`config`
`java.lang.String[]`	`configOverride`	Each value must be written as `key: value`.
`boolean`	`debug`	Enables debug output for extension: used setup objects, hooks and applied config overrides.
`java.lang.Class<? extends GuiceyConfigurationHook>[]`	`hooks`	Hooks provide access to guice builder allowing complete customization of application context in tests.
`boolean`	`reuseApplication`	By default, new application instance is started for each test.
`java.lang.Class<? extends TestEnvironmentSetup>[]`	`setup`	Environment support object is the simplest way to prepare additional objects for test (like database) and apply configuration overrides.

- Element Detail
  - value
```
java.lang.Class<? extends io.dropwizard.Application> value
```
    Returns:
    
    application class
- - config
```
java.lang.String config
```
    Returns:
    
    path to configuration file (optional)
    
    Default:
    
    ""
- - configOverride
```
java.lang.String[] configOverride
```
    Each value must be written as key: value.
    In order to specify raw ConfigOverride values (for delayed evaluation) use direct extension registration with RegisterExtension instead of annotation.
    
    Returns:
    
    list of overridden configuration values (may be used even without real configuration)
    
    Default:
    
    {}
- - hooks
```
java.lang.Class<? extends GuiceyConfigurationHook>[] hooks
```
    Hooks provide access to guice builder allowing complete customization of application context in tests.
    For anonymous hooks you can simply declare hook as field: @EnableHook static GuiceyConfigurationHook hook = builder -> builder.disableExtension(Something.class). Non-static fields may be used only when extension is registered with non-static field (static fields would be also counted in this case). All annotated fields will be detected automatically and objects registered. Fields declared in base test classes are also counted.
    
    Returns:
    
    list of hooks to use
    
    See Also:
    
    for more info, EnableHook
    
    Default:
    
    {}
- - setup
```
java.lang.Class<? extends TestEnvironmentSetup>[] setup
```
    Environment support object is the simplest way to prepare additional objects for test (like database) and apply configuration overrides. Provided classes would be instantiated with the default constructor.
    To avoid confusion with guicey hooks: setup object required to prepare test environment before test (and apply required configurations) whereas hooks is a general mechanism for application customization (not only in tests).
    Anonymous implementation could be simply declared as field: @EnableSetup static TestEnvironmentSetup ext = ext -> ext.configOverrides("foo:1"). Non-static fields may be used only when extension is registered with non-static field (static fields would be also counted in this case). All annotated fields will be detected automatically and objects registered. Fields declared in base test classes are also counted.
    
    Returns:
    
    setup objects to use
    
    See Also:
    
    EnableSetup
    
    Default:
    
    {}
- - debug
```
boolean debug
```
    Enables debug output for extension: used setup objects, hooks and applied config overrides. Might be useful for concurrent tests too because each message includes configuration prefix (exactly pointing to context test or method).
    Configuration overrides are printed after application startup (but before the test) because overridden values are resolved from system properties (applied by DropwizardTestSupport.before()). If application startup failed, no configuration overrides would be printed (because dropwizard would immediately cleanup system properties). Using system properties is the only way to receive actually applied configuration value because property overrides might be implemented as value providers and potentially return different values.
    System property might be used to enable debug mode: -Dguicey.extensions.debug=true. Or alias in code: TestSupport.debugExtensions().
    
    Returns:
    
    true to enable debug output, false otherwise
    
    Default:
    
    false
- - reuseApplication
```
boolean reuseApplication
```
    By default, new application instance is started for each test. If you want to re-use the same application instance between several tests then declare application in BASE test class and enable reuse option: all tests, derived from this base class would use the same application instance.
    You may have multiple base classes with reusable application declaration (different test hierarchies) - in this case, multiple applications would be kept running during tests execution.
    All other extensions (without enabled re-use) will start new applications: take this into account to prevent port clashes with already started reusable apps.
    Reused application instance would be stopped after all tests execution.
    
    Returns:
    
    true to reuse application, false to start application for each test
    
    Default:
    
    false

Annotation Type TestGuiceyApp

Required Element Summary

Optional Element Summary

Element Detail

value

config

configOverride

hooks

setup

debug

reuseApplication