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How to use Annotation Type Rule class of org.junit package

Best junit code snippet using org.junit.Annotation Type Rule

Source:AnnotationProcessingUtilsTest.java

1// Copyright 2017 The Chromium Authors. All rights reserved.2// Use of this source code is governed by a BSD-style license that can be3// found in the LICENSE file.4package org.chromium.base.test.util;5import static org.hamcrest.Matchers.contains;6import static org.junit.Assert.assertEquals;7import static org.junit.Assert.assertNotNull;8import static org.junit.Assert.assertNull;9import static org.junit.Assert.assertThat;10import static org.junit.Assert.fail;11import static org.junit.runner.Description.createTestDescription;12import org.junit.Ignore;13import org.junit.Rule;14import org.junit.Test;15import org.junit.rules.TestRule;16import org.junit.runner.Description;17import org.junit.runner.RunWith;18import org.junit.runners.BlockJUnit4ClassRunner;19import org.junit.runners.model.FrameworkMethod;20import org.junit.runners.model.InitializationError;21import org.junit.runners.model.Statement;22import org.chromium.base.test.util.AnnotationProcessingUtils.AnnotationExtractor;23import java.lang.annotation.Annotation;24import java.lang.annotation.ElementType;25import java.lang.annotation.Retention;26import java.lang.annotation.RetentionPolicy;27import java.lang.annotation.Target;28import java.util.Arrays;29import java.util.Comparator;30import java.util.List;31/** Test for {@link AnnotationProcessingUtils}. */32@RunWith(BlockJUnit4ClassRunner.class)33public class AnnotationProcessingUtilsTest {34    @Test35    public void testGetTargetAnnotation_NotOnClassNorMethod() {36        TargetAnnotation retrievedAnnotation;37        retrievedAnnotation = AnnotationProcessingUtils.getAnnotation(38                createTestDescription(39                        ClassWithoutTargetAnnotation.class, "methodWithoutAnnotation"),40                TargetAnnotation.class);41        assertNull(retrievedAnnotation);42    }43    @Test44    public void testGetTargetAnnotation_NotOnClassButOnMethod() {45        TargetAnnotation retrievedAnnotation;46        retrievedAnnotation = AnnotationProcessingUtils.getAnnotation(47                getTest(ClassWithoutTargetAnnotation.class, "methodWithTargetAnnotation"),48                TargetAnnotation.class);49        assertNotNull(retrievedAnnotation);50    }51    @Test52    public void testGetTargetAnnotation_NotOnClassDifferentOneOnMethod() {53        TargetAnnotation retrievedAnnotation;54        retrievedAnnotation = AnnotationProcessingUtils.getAnnotation(55                getTest(ClassWithoutTargetAnnotation.class, "methodWithAnnotatedAnnotation"),56                TargetAnnotation.class);57        assertNull(retrievedAnnotation);58    }59    @Test60    public void testGetTargetAnnotation_OnClassButNotOnMethod() {61        TargetAnnotation retrievedAnnotation;62        retrievedAnnotation = AnnotationProcessingUtils.getAnnotation(63                getTest(ClassWithAnnotation.class, "methodWithoutAnnotation"),64                TargetAnnotation.class);65        assertNotNull(retrievedAnnotation);66        assertEquals(Location.Class, retrievedAnnotation.value());67    }68    @Test69    public void testGetTargetAnnotation_OnClassAndMethod() {70        TargetAnnotation retrievedAnnotation;71        retrievedAnnotation = AnnotationProcessingUtils.getAnnotation(72                getTest(ClassWithAnnotation.class, "methodWithTargetAnnotation"),73                TargetAnnotation.class);74        assertNotNull(retrievedAnnotation);75        assertEquals(Location.Method, retrievedAnnotation.value());76    }77    @Test78    @Ignore("Rules not supported yet.")79    public void testGetTargetAnnotation_OnRuleButNotOnMethod() {80        TargetAnnotation retrievedAnnotation;81        retrievedAnnotation = AnnotationProcessingUtils.getAnnotation(82                getTest(ClassWithRule.class, "methodWithoutAnnotation"), TargetAnnotation.class);83        assertNotNull(retrievedAnnotation);84        assertEquals(Location.Rule, retrievedAnnotation.value());85    }86    @Test87    @Ignore("Rules not supported yet.")88    public void testGetTargetAnnotation_OnRuleAndMethod() {89        TargetAnnotation retrievedAnnotation;90        retrievedAnnotation = AnnotationProcessingUtils.getAnnotation(91                getTest(ClassWithRule.class, "methodWithTargetAnnotation"), TargetAnnotation.class);92        assertNotNull(retrievedAnnotation);93        assertEquals(Location.Method, retrievedAnnotation.value());94    }95    @Test96    public void testGetMetaAnnotation_Indirectly() {97        MetaAnnotation retrievedAnnotation;98        retrievedAnnotation = AnnotationProcessingUtils.getAnnotation(99                getTest(ClassWithoutTargetAnnotation.class, "methodWithAnnotatedAnnotation"),100                MetaAnnotation.class);101        assertNotNull(retrievedAnnotation);102    }103    @Test104    public void testGetAllTargetAnnotations() {105        List<TargetAnnotation> retrievedAnnotations;106        retrievedAnnotations = AnnotationProcessingUtils.getAnnotations(107                getTest(ClassWithAnnotation.class, "methodWithTargetAnnotation"),108                TargetAnnotation.class);109        assertEquals(2, retrievedAnnotations.size());110        assertEquals(Location.Class, retrievedAnnotations.get(0).value());111        assertEquals(Location.Method, retrievedAnnotations.get(1).value());112    }113    @Test114    public void testGetAllTargetAnnotations_OnParentClass() {115        List<TargetAnnotation> retrievedAnnotations;116        retrievedAnnotations = AnnotationProcessingUtils.getAnnotations(117                getTest(DerivedClassWithoutAnnotation.class, "newMethodWithoutAnnotation"),118                TargetAnnotation.class);119        assertEquals(1, retrievedAnnotations.size());120        assertEquals(Location.Class, retrievedAnnotations.get(0).value());121    }122    @Test123    public void testGetAllTargetAnnotations_OnDerivedMethodAndParentClass() {124        List<TargetAnnotation> retrievedAnnotations;125        retrievedAnnotations = AnnotationProcessingUtils.getAnnotations(126                getTest(DerivedClassWithoutAnnotation.class, "newMethodWithTargetAnnotation"),127                TargetAnnotation.class);128        assertEquals(2, retrievedAnnotations.size());129        assertEquals(Location.Class, retrievedAnnotations.get(0).value());130        assertEquals(Location.DerivedMethod, retrievedAnnotations.get(1).value());131    }132    @Test133    public void testGetAllTargetAnnotations_OnDerivedMethodAndParentClassAndMethod() {134        List<TargetAnnotation> retrievedAnnotations;135        retrievedAnnotations = AnnotationProcessingUtils.getAnnotations(136                getTest(DerivedClassWithoutAnnotation.class, "methodWithTargetAnnotation"),137                TargetAnnotation.class);138        // We should not look at the base implementation of the method. Mostly it should not happen139        // in the context of tests.140        assertEquals(2, retrievedAnnotations.size());141        assertEquals(Location.Class, retrievedAnnotations.get(0).value());142        assertEquals(Location.DerivedMethod, retrievedAnnotations.get(1).value());143    }144    @Test145    public void testGetAllTargetAnnotations_OnDerivedParentAndParentClass() {146        List<TargetAnnotation> retrievedAnnotations;147        retrievedAnnotations = AnnotationProcessingUtils.getAnnotations(148                getTest(DerivedClassWithAnnotation.class, "methodWithoutAnnotation"),149                TargetAnnotation.class);150        assertEquals(2, retrievedAnnotations.size());151        assertEquals(Location.Class, retrievedAnnotations.get(0).value());152        assertEquals(Location.DerivedClass, retrievedAnnotations.get(1).value());153    }154    @Test155    public void testGetAllAnnotations() {156        List<Annotation> annotations;157        AnnotationExtractor annotationExtractor = new AnnotationExtractor(158                TargetAnnotation.class, MetaAnnotation.class, AnnotatedAnnotation.class);159        annotations = annotationExtractor.getMatchingAnnotations(160                getTest(DerivedClassWithAnnotation.class, "methodWithTwoAnnotations"));161        assertEquals(5, annotations.size());162        // Retrieved annotation order:163        // On Parent Class164        assertEquals(TargetAnnotation.class, annotations.get(0).annotationType());165        assertEquals(Location.Class, ((TargetAnnotation) annotations.get(0)).value());166        // On Class167        assertEquals(TargetAnnotation.class, annotations.get(1).annotationType());168        assertEquals(Location.DerivedClass, ((TargetAnnotation) annotations.get(1)).value());169        // Meta-annotations from method170        assertEquals(MetaAnnotation.class, annotations.get(2).annotationType());171        // On Method172        assertEquals(AnnotatedAnnotation.class, annotations.get(3).annotationType());173        assertEquals(TargetAnnotation.class, annotations.get(4).annotationType());174        assertEquals(Location.DerivedMethod, ((TargetAnnotation) annotations.get(4)).value());175    }176    @SuppressWarnings("unchecked")177    @Test178    public void testAnnotationExtractorSortOrder_UnknownAnnotations() {179        AnnotationExtractor annotationExtractor = new AnnotationExtractor(Target.class);180        Comparator<Class<? extends Annotation>> comparator =181                annotationExtractor.getTypeComparator();182        List<Class<? extends Annotation>> testList =183                Arrays.asList(Rule.class, Test.class, Override.class, Target.class, Rule.class);184        testList.sort(comparator);185        assertThat("Unknown annotations should not be reordered and come before the known ones.",186                testList,187                contains(Rule.class, Test.class, Override.class, Rule.class, Target.class));188    }189    @SuppressWarnings("unchecked")190    @Test191    public void testAnnotationExtractorSortOrder_KnownAnnotations() {192        AnnotationExtractor annotationExtractor =193                new AnnotationExtractor(Test.class, Target.class, Rule.class);194        Comparator<Class<? extends Annotation>> comparator =195                annotationExtractor.getTypeComparator();196        List<Class<? extends Annotation>> testList =197                Arrays.asList(Rule.class, Test.class, Override.class, Target.class, Rule.class);198        testList.sort(comparator);199        assertThat(200                "Known annotations should be sorted in the same order as provided to the extractor",201                testList,202                contains(Override.class, Test.class, Target.class, Rule.class, Rule.class));203    }204    private static Description getTest(Class<?> klass, String testName) {205        Description description = null;206        try {207            description = new DummyTestRunner(klass).describe(testName);208        } catch (InitializationError initializationError) {209            initializationError.printStackTrace();210            fail("DummyTestRunner initialization failed:" + initializationError.getMessage());211        }212        if (description == null) {213            fail("Not test named '" + testName + "' in class" + klass.getSimpleName());214        }215        return description;216    }217    // region Test Data: Annotations and dummy test classes218    private enum Location { Unspecified, Class, Method, Rule, DerivedClass, DerivedMethod }219    @Retention(RetentionPolicy.RUNTIME)220    @Target({ElementType.TYPE, ElementType.METHOD})221    private @interface TargetAnnotation {222        Location value() default Location.Unspecified;223    }224    @Retention(RetentionPolicy.RUNTIME)225    @Target({ElementType.ANNOTATION_TYPE, ElementType.TYPE, ElementType.METHOD})226    private @interface MetaAnnotation {}227    @Retention(RetentionPolicy.RUNTIME)228    @Target({ElementType.TYPE, ElementType.METHOD})229    @MetaAnnotation230    private @interface AnnotatedAnnotation {}231    private @interface SimpleAnnotation {}232    @SimpleAnnotation233    private static class ClassWithoutTargetAnnotation {234        @Test235        public void methodWithoutAnnotation() {}236        @Test237        @TargetAnnotation238        public void methodWithTargetAnnotation() {}239        @Test240        @AnnotatedAnnotation241        public void methodWithAnnotatedAnnotation() {}242    }243    @TargetAnnotation(Location.Class)244    private static class ClassWithAnnotation {245        @Test246        public void methodWithoutAnnotation() {}247        @Test248        @TargetAnnotation(Location.Method)249        public void methodWithTargetAnnotation() {}250        @Test251        @MetaAnnotation252        public void methodWithMetaAnnotation() {}253        @Test254        @AnnotatedAnnotation255        public void methodWithAnnotatedAnnotation() {}256    }257    private static class DerivedClassWithoutAnnotation extends ClassWithAnnotation {258        @Test259        public void newMethodWithoutAnnotation() {}260        @Test261        @TargetAnnotation(Location.DerivedMethod)262        public void newMethodWithTargetAnnotation() {}263        @Test264        @Override265        @TargetAnnotation(Location.DerivedMethod)266        public void methodWithTargetAnnotation() {}267    }268    @TargetAnnotation(Location.DerivedClass)269    private static class DerivedClassWithAnnotation extends ClassWithAnnotation {270        @Test271        public void newMethodWithoutAnnotation() {}272        @Test273        @AnnotatedAnnotation274        @TargetAnnotation(Location.DerivedMethod)275        public void methodWithTwoAnnotations() {}276    }277    private static class ClassWithRule {278        @Rule279        Rule1 mRule = new Rule1();280        @Test281        public void methodWithoutAnnotation() {}282        @Test283        @TargetAnnotation284        public void methodWithTargetAnnotation() {}285    }286    @TargetAnnotation(Location.Rule)287    @MetaAnnotation288    private static class Rule1 implements TestRule {289        @Override290        public Statement apply(Statement statement, Description description) {291            return null;292        }293    }294    private static class DummyTestRunner extends BlockJUnit4ClassRunner {295        public DummyTestRunner(Class<?> klass) throws InitializationError {296            super(klass);297        }298        @Override299        protected void collectInitializationErrors(List<Throwable> errors) {300            // Do nothing. BlockJUnit4ClassRunner requires the class to be public, but we don't301            // want/need it.302        }303        public Description describe(String testName) {304            List<FrameworkMethod> tests = getTestClass().getAnnotatedMethods(Test.class);305            for (FrameworkMethod testMethod : tests) {306                if (testMethod.getName().equals(testName)) return describeChild(testMethod);307            }308            return null;309        }310    }311    // endregion312    }...

Source:RuleMemberValidator.java

1package org.junit.internal.runners.rules;2import org.junit.ClassRule;3import org.junit.Rule;4import org.junit.rules.MethodRule;5import org.junit.rules.TestRule;6import org.junit.runners.model.FrameworkMember;7import org.junit.runners.model.TestClass;8import java.lang.annotation.Annotation;9import java.lang.reflect.Modifier;10import java.util.ArrayList;11import java.util.List;12/**13 * A RuleMemberValidator validates the rule fields/methods of a14 * {@link org.junit.runners.model.TestClass}. All reasons for rejecting the15 * {@code TestClass} are written to a list of errors.16 *17 * <p>There are four slightly different validators. The {@link #CLASS_RULE_VALIDATOR}18 * validates fields with a {@link ClassRule} annotation and the19 * {@link #RULE_VALIDATOR} validates fields with a {@link Rule} annotation.</p>20 *21 * <p>The {@link #CLASS_RULE_METHOD_VALIDATOR}22 * validates methods with a {@link ClassRule} annotation and the23 * {@link #RULE_METHOD_VALIDATOR} validates methods with a {@link Rule} annotation.</p>24 */25public class RuleMemberValidator {26    /**27     * Validates fields with a {@link ClassRule} annotation.28     */29    public static final RuleMemberValidator CLASS_RULE_VALIDATOR =30            classRuleValidatorBuilder()31            .withValidator(new DeclaringClassMustBePublic())32            .withValidator(new MemberMustBeStatic())33            .withValidator(new MemberMustBePublic())34            .withValidator(new FieldMustBeATestRule())35            .build();36    /**37     * Validates fields with a {@link Rule} annotation.38     */39    public static final RuleMemberValidator RULE_VALIDATOR =40            testRuleValidatorBuilder()41            .withValidator(new MemberMustBeNonStaticOrAlsoClassRule())42            .withValidator(new MemberMustBePublic())43            .withValidator(new FieldMustBeARule())44            .build();45    /**46     * Validates methods with a {@link ClassRule} annotation.47     */48    public static final RuleMemberValidator CLASS_RULE_METHOD_VALIDATOR =49            classRuleValidatorBuilder()50            .forMethods()51            .withValidator(new DeclaringClassMustBePublic())52            .withValidator(new MemberMustBeStatic())53            .withValidator(new MemberMustBePublic())54            .withValidator(new MethodMustBeATestRule())55            .build();56    /**57     * Validates methods with a {@link Rule} annotation.58     */59    public static final RuleMemberValidator RULE_METHOD_VALIDATOR =60            testRuleValidatorBuilder()61            .forMethods()62            .withValidator(new MemberMustBeNonStaticOrAlsoClassRule())63            .withValidator(new MemberMustBePublic())64            .withValidator(new MethodMustBeARule())65            .build();66    private final Class<? extends Annotation> annotation;67    private final boolean methods;68    private final List<RuleValidator> validatorStrategies;69    RuleMemberValidator(Builder builder) {70        this.annotation = builder.annotation;71        this.methods = builder.methods;72        this.validatorStrategies = builder.validators;73    }74    /**75     * Validate the {@link org.junit.runners.model.TestClass} and adds reasons76     * for rejecting the class to a list of errors.77     *78     * @param target the {@code TestClass} to validate.79     * @param errors the list of errors.80     */81    public void validate(TestClass target, List<Throwable> errors) {82        List<? extends FrameworkMember<?>> members = methods ? target.getAnnotatedMethods(annotation)83                : target.getAnnotatedFields(annotation);84        for (FrameworkMember<?> each : members) {85            validateMember(each, errors);86        }87    }88    private void validateMember(FrameworkMember<?> member, List<Throwable> errors) {89        for (RuleValidator strategy : validatorStrategies) {90            strategy.validate(member, annotation, errors);91        }92    }93    private static Builder classRuleValidatorBuilder() {94        return new Builder(ClassRule.class);95    }96    private static Builder testRuleValidatorBuilder() {97        return new Builder(Rule.class);98    }99    private static class Builder {100        private final Class<? extends Annotation> annotation;101        private boolean methods;102        private final List<RuleValidator> validators;103        private Builder(Class<? extends Annotation> annotation) {104            this.annotation = annotation;105            this.methods = false;106            this.validators = new ArrayList<RuleValidator>();107        }108        Builder forMethods() {109            methods = true;110            return this;111        }112        Builder withValidator(RuleValidator validator) {113            validators.add(validator);114            return this;115        }116        RuleMemberValidator build() {117            return new RuleMemberValidator(this);118        }119    }120    private static boolean isRuleType(FrameworkMember<?> member) {121        return isMethodRule(member) || isTestRule(member);122    }123    private static boolean isTestRule(FrameworkMember<?> member) {124        return TestRule.class.isAssignableFrom(member.getType());125    }126    private static boolean isMethodRule(FrameworkMember<?> member) {127        return MethodRule.class.isAssignableFrom(member.getType());128    }129    /**130     * Encapsulates a single piece of validation logic, used to determine if {@link org.junit.Rule} and131     * {@link org.junit.ClassRule} annotations have been used correctly132     */133    interface RuleValidator {134        /**135         * Examine the given member and add any violations of the strategy's validation logic to the given list of errors136         * @param member The member (field or member) to examine137         * @param annotation The type of rule annotation on the member138         * @param errors The list of errors to add validation violations to139         */140        void validate(FrameworkMember<?> member, Class<? extends Annotation> annotation, List<Throwable> errors);141    }142    /**143     * Requires the validated member to be non-static144     */145    private static final class MemberMustBeNonStaticOrAlsoClassRule implements RuleValidator {146        public void validate(FrameworkMember<?> member, Class<? extends Annotation> annotation, List<Throwable> errors) {147            boolean isMethodRuleMember = isMethodRule(member);148            boolean isClassRuleAnnotated = (member.getAnnotation(ClassRule.class) != null);149            // We disallow:150            //  - static MethodRule members151            //  - static @Rule annotated members152            //    - UNLESS they're also @ClassRule annotated153            // Note that MethodRule cannot be annotated with @ClassRule154            if (member.isStatic() && (isMethodRuleMember || !isClassRuleAnnotated)) {155                String message;156                if (isMethodRule(member)) {157                    message = "must not be static.";158                } else {159                    message = "must not be static or it must be annotated with @ClassRule.";160                }161                errors.add(new ValidationError(member, annotation, message));162            }163        }164    }165    /**166     * Requires the member to be static167     */168    private static final class MemberMustBeStatic implements RuleValidator {169        public void validate(FrameworkMember<?> member, Class<? extends Annotation> annotation, List<Throwable> errors) {170            if (!member.isStatic()) {171                errors.add(new ValidationError(member, annotation,172                        "must be static."));173            }174        }175    }176    /**177     * Requires the member's declaring class to be public178     */179    private static final class DeclaringClassMustBePublic implements RuleValidator {180        public void validate(FrameworkMember<?> member, Class<? extends Annotation> annotation, List<Throwable> errors) {181            if (!isDeclaringClassPublic(member)) {182                errors.add(new ValidationError(member, annotation,183                        "must be declared in a public class."));184            }185        }186        private boolean isDeclaringClassPublic(FrameworkMember<?> member) {187            return Modifier.isPublic(member.getDeclaringClass().getModifiers());188        }189    }190    /**191     * Requires the member to be public192     */193    private static final class MemberMustBePublic implements RuleValidator {194        public void validate(FrameworkMember<?> member, Class<? extends Annotation> annotation, List<Throwable> errors) {195            if (!member.isPublic()) {196                errors.add(new ValidationError(member, annotation,197                        "must be public."));198            }199        }200    }201    /**202     * Requires the member is a field implementing {@link org.junit.rules.MethodRule} or {@link org.junit.rules.TestRule}203     */204    private static final class FieldMustBeARule implements RuleValidator {205        public void validate(FrameworkMember<?> member, Class<? extends Annotation> annotation, List<Throwable> errors) {206            if (!isRuleType(member)) {207                errors.add(new ValidationError(member, annotation,208                        "must implement MethodRule or TestRule."));209            }210        }211    }212    /**213     * Require the member to return an implementation of {@link org.junit.rules.MethodRule} or214     * {@link org.junit.rules.TestRule}215     */216    private static final class MethodMustBeARule implements RuleValidator {217        public void validate(FrameworkMember<?> member, Class<? extends Annotation> annotation, List<Throwable> errors) {218            if (!isRuleType(member)) {219                errors.add(new ValidationError(member, annotation,220                        "must return an implementation of MethodRule or TestRule."));221            }222        }223    }224    225    /**226     * Require the member to return an implementation of {@link org.junit.rules.TestRule}227     */228    private static final class MethodMustBeATestRule implements RuleValidator {229        public void validate(FrameworkMember<?> member,230                Class<? extends Annotation> annotation, List<Throwable> errors) {231            if (!isTestRule(member)) {232                errors.add(new ValidationError(member, annotation, 233                        "must return an implementation of TestRule."));234            }235        }236    }237    238    /**239     * Requires the member is a field implementing {@link org.junit.rules.TestRule}240     */241    private static final class FieldMustBeATestRule implements RuleValidator {242        public void validate(FrameworkMember<?> member,243                Class<? extends Annotation> annotation, List<Throwable> errors) {244            if (!isTestRule(member)) {245                errors.add(new ValidationError(member, annotation,246                        "must implement TestRule."));247            }248        }249    }250}...

Source:RuleFieldValidator.java

1package org.junit.internal.runners.rules;2import java.lang.annotation.Annotation;3import java.util.List;4import org.junit.ClassRule;5import org.junit.Rule;6import org.junit.rules.MethodRule;7import org.junit.rules.TestRule;8import org.junit.runners.model.FrameworkMember;9import org.junit.runners.model.TestClass;10/**11 * A RuleFieldValidator validates the rule fields of a12 * {@link org.junit.runners.model.TestClass}. All reasons for rejecting the13 * {@code TestClass} are written to a list of errors.14 *15 * There are four slightly different validators. The {@link #CLASS_RULE_VALIDATOR}16 * validates fields with a {@link ClassRule} annotation and the17 * {@link #RULE_VALIDATOR} validates fields with a {@link Rule} annotation.18 *19 * The {@link #CLASS_RULE_METHOD_VALIDATOR}20 * validates methods with a {@link ClassRule} annotation and the21 * {@link #RULE_METHOD_VALIDATOR} validates methods with a {@link Rule} annotation.22 */23public enum RuleFieldValidator {24    /**25     * Validates fields with a {@link ClassRule} annotation.26     */27    CLASS_RULE_VALIDATOR(ClassRule.class, false, true),28    /**29     * Validates fields with a {@link Rule} annotation.30     */31    RULE_VALIDATOR(Rule.class, false, false),32    /**33     * Validates methods with a {@link ClassRule} annotation.34     */35    CLASS_RULE_METHOD_VALIDATOR(ClassRule.class, true, true),36    /**37     * Validates methods with a {@link Rule} annotation.38     */39    RULE_METHOD_VALIDATOR(Rule.class, true, false);40    private final Class<? extends Annotation> fAnnotation;41    private final boolean fStaticMembers;42    private final boolean fMethods;43    private RuleFieldValidator(Class<? extends Annotation> annotation,44            boolean methods, boolean fStaticMembers) {45        this.fAnnotation = annotation;46        this.fStaticMembers = fStaticMembers;47        this.fMethods = methods;48    }49    /**50     * Validate the {@link org.junit.runners.model.TestClass} and adds reasons51     * for rejecting the class to a list of errors.52     *53     * @param target the {@code TestClass} to validate.54     * @param errors the list of errors.55     */56    public void validate(TestClass target, List<Throwable> errors) {57        List<? extends FrameworkMember<?>> members = fMethods ? target.getAnnotatedMethods(fAnnotation)58                : target.getAnnotatedFields(fAnnotation);59        for (FrameworkMember<?> each : members) {60            validateMember(each, errors);61        }62    }63    private void validateMember(FrameworkMember<?> member, List<Throwable> errors) {64        validateStatic(member, errors);65        validatePublic(member, errors);66        validateTestRuleOrMethodRule(member, errors);67    }68    private void validateStatic(FrameworkMember<?> member,69            List<Throwable> errors) {70        if (fStaticMembers && !member.isStatic()) {71            addError(errors, member, "must be static.");72        }73        if (!fStaticMembers && member.isStatic()) {74            addError(errors, member, "must not be static.");75        }76    }77    private void validatePublic(FrameworkMember<?> member, List<Throwable> errors) {78        if (!member.isPublic()) {79            addError(errors, member, "must be public.");80        }81    }82    private void validateTestRuleOrMethodRule(FrameworkMember<?> member,83            List<Throwable> errors) {84        if (!isMethodRule(member) && !isTestRule(member)) {85            addError(errors, member, fMethods ?86                    "must return an implementation of MethodRule or TestRule." :87                    "must implement MethodRule or TestRule.");88        }89    }90    private boolean isTestRule(FrameworkMember<?> member) {91        return TestRule.class.isAssignableFrom(member.getType());92    }93    @SuppressWarnings("deprecation")94    private boolean isMethodRule(FrameworkMember<?> member) {95        return MethodRule.class.isAssignableFrom(member.getType());96    }97    private void addError(List<Throwable> errors, FrameworkMember<?> member,98            String suffix) {99        String message = "The @" + fAnnotation.getSimpleName() + " '"100                + member.getName() + "' " + suffix;101        errors.add(new Exception(message));102    }103}...

Annotation Type Rule

Using AI Code Generation

1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ExpectedException;4public class TestExceptionRule {5    public ExpectedException thrown = ExpectedException.none();6    public void throwsNothing() {7    }8    public void throwsNullPointerException() {9        thrown.expect(NullPointerException.class);10        throw new NullPointerException();11    }12    public void throwsNullPointerExceptionWithMessage() {13        thrown.expect(NullPointerException.class);14        thrown.expectMessage("Hello World");15        throw new NullPointerException("Hello World");16    }17}

Annotation Type Rule

Using AI Code Generation

1package com.journaldev.junit;2import org.junit.rules.TestRule;3import org.junit.runner.Description;4import org.junit.runners.model.Statement;5public class MyRule implements TestRule {6    public Statement apply(Statement base, Description description) {7        return base;8    }9}10package com.journaldev.junit;11import org.junit.rules.TestRule;12import org.junit.runner.Description;13import org.junit.runners.model.Statement;14public class MyRule implements TestRule {15    public Statement apply(Statement base, Description description) {16        return base;17    }18}19package com.journaldev.junit;20import org.junit.rules.TestRule;21import org.junit.runner.Description;22import org.junit.runners.model.Statement;23public class MyRule implements TestRule {24    public Statement apply(Statement base, Description description) {25        return base;26    }27}28package com.journaldev.junit;29import org.junit.rules.TestRule;30import org.junit.runner.Description;31import org.junit.runners.model.Statement;32public class MyRule implements TestRule {33    public Statement apply(Statement base, Description description) {34        return base;35    }36}37package com.journaldev.junit;38import org.junit.rules.TestRule;39import org.junit.runner.Description;40import org.junit.runners.model.Statement;41public class MyRule implements TestRule {42    public Statement apply(Statement base, Description description) {43        return base;44    }45}46package com.journaldev.junit;47import org.junit.rules.TestRule;48import org.junit.runner.Description;49import org.junit.runners.model.Statement;50public class MyRule implements TestRule {51    public Statement apply(Statement base, Description description) {52        return base;53    }54}55package com.journaldev.junit;56import org.junit.rules.TestRule;57import org.junit.runner.Description;58import org.junit.runners.model.Statement;59public class MyRule implements TestRule {60    public Statement apply(Statement base, Description description) {61        return base;62    }63}

Annotation Type Rule

Using AI Code Generation

1import org.junit.Test;2import org.junit.Ignore;3import org.junit.Before;4import org.junit.After;5import org.junit.BeforeClass;6import org.junit.AfterClass;7public class TestJunit1 {8   public static void beforeClass() {9      System.out.println("in before class");10   }11   public static void  afterClass() {12      System.out.println("in after class");13   }14   public void before() {15      System.out.println("in before");16   }17   public void after() {18      System.out.println("in after");19   }20   public void test() {21      System.out.println("in test");22   }23   public void ignoreTest() {24      System.out.println("in ignore test");25   }26}27public class CustomRule implements TestRule {28   public Statement apply(Statement base, Description description) {29      return statement(base, description);30   }31   private Statement statement(final Statement base, Description description) {32      return new Statement() {33         public void evaluate() throws Throwable {34            System.out.println("in custom rule");35            try {36               base.evaluate();37            } finally {38               System.out.println("in custom rule");39            }40         }41      };42   }43}

Annotation Type Rule

Using AI Code Generation

1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.Timeout;4public class TimeoutTest {5    public Timeout globalTimeout = new Timeout(2000);6    public void infiniteLoop1() {7        while (true) {8        }9    }10    public void infiniteLoop2() {11        while (true) {12        }13    }14}15        at java.lang.Thread.sleep(Native Method)16        at org.junit.rules.Timeout$1.evaluate(Timeout.java:106)17        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)18        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)19        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)20        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)21        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)22        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)23        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)24        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)25        at org.junit.runners.ParentRunner.run(ParentRunner.java:309)26        at org.junit.runner.JUnitCore.run(JUnitCore.java:160)27        at org.junit.runner.JUnitCore.run(JUnitCore.java:138)28        at org.junit.runner.JUnitCore.runMain(JUnitCore.java:117)29        at org.junit.runner.JUnitCore.main(JUnitCore.java:106)30package com.mkyong.common;31import org.junit.Test;32public class InfiniteLoopTest {33    public void infiniteLoop1() {34        while (true) {35        }36    }37    public void infiniteLoop2() {38        while (true) {39        }40    }41}42        at java.lang.Thread.sleep(Native Method)43        at org.junit.rules.Timeout$1.evaluate(Timeout.java:106)

Annotation Type Rule

Using AI Code Generation

1import org.junit.*;2import org.junit.rules.Timeout;3import org.junit.runner.Description;4public class TestJUnit {5   public Timeout globalTimeout = new Timeout(20);6   public void testInfiniteLoop1() {7      while (true);8   }9   public void testInfiniteLoop2() {10      while (true);11   }12   public void testInfiniteLoop3() {13      while (true);14   }15}

Source: How to map a composite key with JPA and Hibernate?

1@Pointcut("if()")2public static boolean isActive() {3    return Aspects.aspectOf(PerformanceMonitorAspect.class).eventJournalService != null;4}56// ...78@AfterReturning(pointcut = "isActive() && anyPublicMethod() && inService() && @annotation(eventJournal) && args(entity,..)", returning = "id")9// ...1011@AfterThrowing(pointcut = "isActive() && anyPublicMethod() && inService() && @annotation(eventJournal) && args(entity,..)", throwing="ex")12// ...13

Source:How to map a composite key with JPA and Hibernate?

@Pointcut("if()")
public static boolean isActive() {
    return Aspects.aspectOf(PerformanceMonitorAspect.class).eventJournalService != null;
}

// ...

@AfterReturning(pointcut = "isActive() && anyPublicMethod() && inService() && @annotation(eventJournal) && args(entity,..)", returning = "id")
// ...

@AfterThrowing(pointcut = "isActive() && anyPublicMethod() && inService() && @annotation(eventJournal) && args(entity,..)", throwing="ex")
// ...

JUnit Tutorial:

LambdaTest also has a detailed JUnit tutorial explaining its features, importance, advanced use cases, best practices, and more to help you get started with running your automation testing scripts.

JUnit Tutorial Chapters:

Here are the detailed JUnit testing chapters to help you get started:

Importance of Unit testing - Learn why Unit testing is essential during the development phase to identify bugs and errors.
Top Java Unit testing frameworks - Here are the upcoming JUnit automation testing frameworks that you can use in 2023 to boost your unit testing.
What is the JUnit framework
Why is JUnit testing important - Learn the importance and numerous benefits of using the JUnit testing framework.
Features of JUnit - Learn about the numerous features of JUnit and why developers prefer it.
JUnit 5 vs. JUnit 4: Differences - Here is a complete comparison between JUnit 5 and JUnit 4 testing frameworks.
Setting up the JUnit environment - Learn how to set up your JUnit testing environment.
Getting started with JUnit testing - After successfully setting up your JUnit environment, this chapter will help you get started with JUnit testing in no time.
Parallel testing with JUnit - Parallel Testing can be used to reduce test execution time and improve test efficiency. Learn how to perform parallel testing with JUnit.
Annotations in JUnit - When writing automation scripts with JUnit, we can use JUnit annotations to specify the type of methods in our test code. This helps us identify those methods when we run JUnit tests using Selenium WebDriver. Learn in detail what annotations are in JUnit.
Assertions in JUnit - Assertions are used to validate or test that the result of an action/functionality is the same as expected. Learn in detail what assertions are and how to use them while performing JUnit testing.
Parameterization in JUnit - Parameterized Test enables you to run the same automated test scripts with different variables. By collecting data on each method's test parameters, you can minimize time spent on writing tests. Learn how to use parameterization in JUnit.
Nested Tests In JUnit 5 - A nested class is a non-static class contained within another class in a hierarchical structure. It can share the state and setup of the outer class. Learn about nested annotations in JUnit 5 with examples.
Best practices for JUnit testing - Learn about the best practices, such as always testing key methods and classes, integrating JUnit tests with your build, and more to get the best possible results.
Advanced Use Cases for JUnit testing - Take a deep dive into the advanced use cases, such as how to run JUnit tests in Jupiter, how to use JUnit 5 Mockito for Unit testing, and more for JUnit testing.