Best junit code snippet using org.junit.validator.AnnotationValidatorFactory
...5import java.lang.annotation.Annotation;6import static org.hamcrest.core.Is.is;7import static org.hamcrest.core.IsInstanceOf.instanceOf;8import static org.junit.Assert.assertThat;9public class AnnotationValidatorFactoryTest {10 @Rule11 public ExpectedException exception = ExpectedException.none();12 @Test13 public void createAnnotationValidator() {14 ValidateWith validateWith = SampleTestWithValidator.class.getAnnotation(ValidateWith.class);15 AnnotationValidator annotationValidator = new AnnotationValidatorFactory().createAnnotationValidator(validateWith);16 assertThat(annotationValidator, is(instanceOf(Validator.class)));17 }18 @Test19 public void exceptionWhenAnnotationWithNullClassIsPassedIn() {20 exception.expect(IllegalArgumentException.class);21 exception.expectMessage("Can't create validator, value is null in " +22 "annotation org.junit.validator.AnnotationValidatorFactoryTest$ValidatorWithNullValue");23 new AnnotationValidatorFactory().createAnnotationValidator(new ValidatorWithNullValue());24 }25 public static class ValidatorWithNullValue implements ValidateWith {26 public Class<? extends AnnotationValidator> value() {27 return null;28 }29 public Class<? extends Annotation> annotationType() {30 return ValidateWith.class;31 }32 }33 @ValidateWith(value = Validator.class)34 public static class SampleTestWithValidator {35 }36 public static class Validator extends AnnotationValidator {37 }38 @Test39 public void exceptionWhenAnnotationValidatorCantBeCreated() {40 ValidateWith validateWith = SampleTestWithValidatorThatThrowsException.class.getAnnotation(ValidateWith.class);41 exception.expect(RuntimeException.class);42 exception.expectMessage("Exception received when creating AnnotationValidator class " +43 "org.junit.validator.AnnotationValidatorFactoryTest$ValidatorThatThrowsException");44 new AnnotationValidatorFactory().createAnnotationValidator(validateWith);45 }46 @ValidateWith(value = ValidatorThatThrowsException.class)47 public static class SampleTestWithValidatorThatThrowsException {48 }49 public static class ValidatorThatThrowsException extends AnnotationValidator {50 public ValidatorThatThrowsException() throws InstantiationException {51 throw new InstantiationException("Simulating exception in test");52 }53 }54}...
Source: AnnotationValidatorFactory.java
1public class org.junit.validator.AnnotationValidatorFactory {2 public org.junit.validator.AnnotationValidatorFactory();3 public org.junit.validator.AnnotationValidator createAnnotationValidator(org.junit.validator.ValidateWith);4 static {};5}...
AnnotationValidatorFactory
Using AI Code Generation
1public class AnnotationValidatorFactoryExample {2public static void main(String[] args) {3AnnotationValidatorFactory factory = new AnnotationValidatorFactory();4AnnotationValidator validator = factory.getValidator();5AnnotationValidator validatorForClass = factory.getValidatorForClass(AnnotationValidatorFactoryExample.class);6AnnotationValidator validatorForClassAndMethod = factory.getValidatorForClassAndMethod(AnnotationValidatorFactoryExample.class, "main", String[].class);7}8}
AnnotationValidatorFactory
Using AI Code Generation
1public AnnotationValidatorFactory validatorFactory = new AnnotationValidatorFactory();2public void test() {3 AnnotationValidator validator = validatorFactory.getValidator();4 validator.validateAnnotatedMethod(AnnotationValidatorTest.class.getMethod("test"));5}6public ExpectedException exception = ExpectedException.none();7public void test() throws NoSuchMethodException {8 AnnotationValidator validator = validatorFactory.getValidator();9 exception.expect(AnnotationValidator.ValidationException.class);10 validator.validateAnnotatedMethod(AnnotationValidatorTest.class.getMethod("test"));11}12public AnnotationValidator.ValidationException(org.junit.runners.model.FrameworkMethod method,13public org.junit.runners.model.FrameworkMethod getMethod()14public java.lang.annotation.Annotation getAnnotation()15public java.lang.String getMessage()
AnnotationValidatorFactory
Using AI Code Generation
1 [javac] import org.junit.validator.AnnotationValidator;2 [javac] import org.junit.validator.ValidateWith;3 [javac] import org.junit.validator.Validator;4 [javac] import org.junit.validator.ValidatorException;5 [javac] import org.junit.validator.ValidatorFactory;6 [javac] import org.junit.validator.ValidatorService;7 [javac] import org.junit.validator.ValidatorServiceException;8 [javac] import org.junit.validator.ValidatorServiceLoader;
AnnotationValidatorFactory
Using AI Code Generation
1import org.junit.validator.AnnotationValidatorFactory;2import org.junit.validator.AnnotationValidator;3import java.util.List;4public class TestClass {5 public static void main(String args[]) {6 AnnotationValidatorFactory validatorFactory = new AnnotationValidatorFactory();7 List<AnnotationValidator> validators = validatorFactory.getValidators();8 for (AnnotationValidator validator : validators) {9 System.out.println(validator);10 }11 }12}13Example 2: Using getAnnotationValidator() method14import org.junit.validator.AnnotationValidatorFactory;15import org.junit.validator.AnnotationValidator;16import java.lang.annotation.Annotation;17public class TestClass {18 public static void main(String args[]) {19 AnnotationValidatorFactory validatorFactory = new AnnotationValidatorFactory();20 AnnotationValidator validator = validatorFactory.getAnnotationValidator(Annotation.class);21 System.out.println(validator);22 }23}24Example 3: Using getValidator() method25import org.junit.validator.AnnotationValidatorFactory;26import org.junit.validator.AnnotationValidator;27import java.lang.annotation.Annotation;28public class TestClass {29 public static void main(String args[]) {30 AnnotationValidatorFactory validatorFactory = new AnnotationValidatorFactory();31 AnnotationValidator validator = validatorFactory.getValidator(Annotation.class);32 System.out.println(validator);33 }34}35Example 4: Using getAnnotationValidator() method36import org.junit.validator.AnnotationValidatorFactory;37import org.junit.validator.AnnotationValidator;38import java.lang.annotation.Annotation;39public class TestClass {40 public static void main(String args[]) {41 AnnotationValidatorFactory validatorFactory = new AnnotationValidatorFactory();42 AnnotationValidator validator = validatorFactory.getAnnotationValidator(Annotation.class);43 System.out.println(validator);44 }45}46Example 5: Using getValidator() method47import org.junit.validator.AnnotationValidatorFactory;48import org.junit.validator.AnnotationValidator;49import java.lang.annotation.Annotation;50public class TestClass {51 public static void main(String args[]) {52 AnnotationValidatorFactory validatorFactory = new AnnotationValidatorFactory();53 AnnotationValidator validator = validatorFactory.getValidator(Annotation.class
JUnit 4 Expected Exception type
java: how to mock Calendar.getInstance()?
Changing names of parameterized tests
Mocking a class vs. mocking its interface
jUnit ignore @Test methods from base class
Important frameworks/tools to learn
Unit testing a Java Servlet
Meaning of delta or epsilon argument of assertEquals for double values
Different teardown for each @Test in jUnit
Best way to automagically migrate tests from JUnit 3 to JUnit 4?
There's actually an alternative to the @Test(expected=Xyz.class)
in JUnit 4.7 using Rule
and ExpectedException
In your test case you declare an ExpectedException
annotated with @Rule
, and assign it a default value of ExpectedException.none()
. Then in your test that expects an exception you replace the value with the actual expected value. The advantage of this is that without using the ugly try/catch method, you can further specify what the message within the exception was
@Rule public ExpectedException thrown= ExpectedException.none();
@Test
public void myTest() {
thrown.expect( Exception.class );
thrown.expectMessage("Init Gold must be >= 0");
rodgers = new Pirate("Dread Pirate Rodgers" , -100);
}
Using this method, you might be able to test for the message in the generic exception to be something specific.
ADDITION
Another advantage of using ExpectedException
is that you can more precisely scope the exception within the context of the test case. If you are only using @Test(expected=Xyz.class)
annotation on the test, then the Xyz exception can be thrown anywhere in the test code -- including any test setup or pre-asserts within the test method. This can lead to a false positive.
Using ExpectedException, you can defer specifying the thrown.expect(Xyz.class)
until after any setup and pre-asserts, just prior to actually invoking the method under test. Thus, you more accurately scope the exception to be thrown by the actual method invocation rather than any of the test fixture itself.
JUnit 5 NOTE:
JUnit 5 JUnit Jupiter has removed @Test(expected=...)
, @Rule
and ExpectedException
altogether. They are replaced with the new assertThrows()
, which requires the use of Java 8 and lambda syntax. ExpectedException
is still available for use in JUnit 5 through JUnit Vintage. Also JUnit Jupiter will also continue to support JUnit 4 ExpectedException
through use of the junit-jupiter-migrationsupport module, but only if you add an additional class-level annotation of @EnableRuleMigrationSupport
.
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