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JUnit 4 Rule to run individual tests with a different default locale
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| import java.util.Locale; | |
| import org.junit.rules.TestWatcher; | |
| import org.junit.runner.Description; | |
| public class DefaultLocaleRule extends TestWatcher { | |
| private Locale originalDefault; | |
| private Locale currentDefault; | |
| public DefaultLocaleRule() { | |
| this( null ); | |
| } | |
| public DefaultLocaleRule( Locale defaultForTests ) { | |
| currentDefault = defaultForTests; | |
| } | |
| @Override | |
| protected void starting( Description description ) { | |
| originalDefault = Locale.getDefault(); | |
| if( null != currentDefault ) { | |
| Locale.setDefault( currentDefault ); | |
| } | |
| } | |
| @Override | |
| protected void finished( Description description ) { | |
| Locale.setDefault( originalDefault ); | |
| } | |
| public void setDefault( Locale locale ) { | |
| if( null == locale ) { | |
| locale = originalDefault; | |
| } | |
| Locale.setDefault( locale ); | |
| } | |
| public static DefaultLocaleRule en() { | |
| return new DefaultLocaleRule( Locale.ENGLISH ); | |
| } | |
| public static DefaultLocaleRule de() { | |
| return new DefaultLocaleRule( Locale.GERMAN ); | |
| } | |
| public static DefaultLocaleRule fr() { | |
| return new DefaultLocaleRule( Locale.FRENCH ); | |
| } | |
| } |
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| To use the rule, add this to your JUnit test class: | |
| // make all tests run with the English locale | |
| @Rule | |
| public DefaultLocaleRule defaultLocaleRule = DefaultLocaleRule.en(); | |
| If a test has special demands, you can switch: | |
| @Test | |
| public void testDE() { | |
| defaultLocaleRule.setDefault( Locale.GERMAN ); | |
| ... | |
| } |
I found the reason. It seems like @BeforeClass block are run first, then @rule block is run. So the solute I found is to replace the @rule annotation with @ClassRule that is run before @BeforeClass block and the rule variable should be static:
@ClassRule
public static DefaultLocaleRule defaultLocaleRule = DefaultLocaleRule.fr();
@BeforeClass
public static void setUp() {
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
validator = factory.getValidator();
}
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It fails when using
before_classand javax.validation.Validator as follows:Here is the output:
It seems like Validator does not take it in account.
By te way, if I remove the commented code that forces th FR locale in
before_classblock, and remove all the call to DefaultRule class, it works as need. Unfortunately, it is not so DRY and the FR locale has to beard coded :(.Any idea about that?
Thank you.