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

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

Source:BlockJUnit4ClassRunnerWithParameters.java

1package org.junit.runners.parameterized;2import java.lang.annotation.Annotation;3import java.lang.reflect.Field;4import java.util.List;5import org.junit.internal.runners.statements.RunAfters;6import org.junit.internal.runners.statements.RunBefores;7import org.junit.runner.RunWith;8import org.junit.runner.notification.RunNotifier;9import org.junit.runners.BlockJUnit4ClassRunner;10import org.junit.runners.Parameterized;11import org.junit.runners.Parameterized.Parameter;12import org.junit.runners.model.FrameworkField;13import org.junit.runners.model.FrameworkMethod;14import org.junit.runners.model.InitializationError;15import org.junit.runners.model.Statement;16/**17 * A {@link BlockJUnit4ClassRunner} with parameters support. Parameters can be18 * injected via constructor or into annotated fields.19 */20public class BlockJUnit4ClassRunnerWithParameters extends21        BlockJUnit4ClassRunner {22    private enum InjectionType {23        CONSTRUCTOR, FIELD24    }25    private final Object[] parameters;26    private final String name;27    public BlockJUnit4ClassRunnerWithParameters(TestWithParameters test)28            throws InitializationError {29        super(test.getTestClass());30        parameters = test.getParameters().toArray(31                new Object[test.getParameters().size()]);32        name = test.getName();33    }34    @Override35    public Object createTest() throws Exception {36        InjectionType injectionType = getInjectionType();37        switch (injectionType) {38            case CONSTRUCTOR:39                return createTestUsingConstructorInjection();40            case FIELD:41                return createTestUsingFieldInjection();42            default:43                throw new IllegalStateException("The injection type "44                        + injectionType + " is not supported.");45        }46    }47    private Object createTestUsingConstructorInjection() throws Exception {48        return getTestClass().getOnlyConstructor().newInstance(parameters);49    }50    private Object createTestUsingFieldInjection() throws Exception {51        List<FrameworkField> annotatedFieldsByParameter = getAnnotatedFieldsByParameter();52        if (annotatedFieldsByParameter.size() != parameters.length) {53            throw new Exception(54                    "Wrong number of parameters and @Parameter fields."55                            + " @Parameter fields counted: "56                            + annotatedFieldsByParameter.size()57                            + ", available parameters: " + parameters.length58                            + ".");59        }60        Object testClassInstance = getTestClass().getJavaClass().newInstance();61        for (FrameworkField each : annotatedFieldsByParameter) {62            Field field = each.getField();63            Parameter annotation = field.getAnnotation(Parameter.class);64            int index = annotation.value();65            try {66                field.set(testClassInstance, parameters[index]);67            } catch (IllegalAccessException e) {68                IllegalAccessException wrappedException = new IllegalAccessException(69                        "Cannot set parameter '" + field.getName()70                                + "'. Ensure that the field '" + field.getName()71                                + "' is public.");72                wrappedException.initCause(e);73                throw wrappedException;74            } catch (IllegalArgumentException iare) {75                throw new Exception(getTestClass().getName()76                        + ": Trying to set " + field.getName()77                        + " with the value " + parameters[index]78                        + " that is not the right type ("79                        + parameters[index].getClass().getSimpleName()80                        + " instead of " + field.getType().getSimpleName()81                        + ").", iare);82            }83        }84        return testClassInstance;85    }86    @Override87    protected String getName() {88        return name;89    }90    @Override91    protected String testName(FrameworkMethod method) {92        return method.getName() + getName();93    }94    @Override95    protected void validateConstructor(List<Throwable> errors) {96        validateOnlyOneConstructor(errors);97        if (getInjectionType() != InjectionType.CONSTRUCTOR) {98            validateZeroArgConstructor(errors);99        }100    }101    @Override102    protected void validateFields(List<Throwable> errors) {103        super.validateFields(errors);104        if (getInjectionType() == InjectionType.FIELD) {105            List<FrameworkField> annotatedFieldsByParameter = getAnnotatedFieldsByParameter();106            int[] usedIndices = new int[annotatedFieldsByParameter.size()];107            for (FrameworkField each : annotatedFieldsByParameter) {108                int index = each.getField().getAnnotation(Parameter.class)109                        .value();110                if (index < 0 || index > annotatedFieldsByParameter.size() - 1) {111                    errors.add(new Exception("Invalid @Parameter value: "112                            + index + ". @Parameter fields counted: "113                            + annotatedFieldsByParameter.size()114                            + ". Please use an index between 0 and "115                            + (annotatedFieldsByParameter.size() - 1) + "."));116                } else {117                    usedIndices[index]++;118                }119            }120            for (int index = 0; index < usedIndices.length; index++) {121                int numberOfUse = usedIndices[index];122                if (numberOfUse == 0) {123                    errors.add(new Exception("@Parameter(" + index124                            + ") is never used."));125                } else if (numberOfUse > 1) {126                    errors.add(new Exception("@Parameter(" + index127                            + ") is used more than once (" + numberOfUse + ")."));128                }129            }130        }131    }132    @Override133    protected Statement classBlock(RunNotifier notifier) {134        Statement statement = childrenInvoker(notifier);135        statement = withBeforeParams(statement);136        statement = withAfterParams(statement);137        return statement;138    }139    private Statement withBeforeParams(Statement statement) {140        List<FrameworkMethod> befores = getTestClass()141                .getAnnotatedMethods(Parameterized.BeforeParam.class);142        return befores.isEmpty() ? statement : new RunBeforeParams(statement, befores);143    }144    private class RunBeforeParams extends RunBefores {145        RunBeforeParams(Statement next, List<FrameworkMethod> befores) {146            super(next, befores, null);147        }148        @Override149        protected void invokeMethod(FrameworkMethod method) throws Throwable {150            int paramCount = method.getMethod().getParameterTypes().length;151            method.invokeExplosively(null, paramCount == 0 ? (Object[]) null : parameters);152        }153    }154    private Statement withAfterParams(Statement statement) {155        List<FrameworkMethod> afters = getTestClass()156                .getAnnotatedMethods(Parameterized.AfterParam.class);157        return afters.isEmpty() ? statement : new RunAfterParams(statement, afters);158    }159    private class RunAfterParams extends RunAfters {160        RunAfterParams(Statement next, List<FrameworkMethod> afters) {161            super(next, afters, null);162        }163        @Override164        protected void invokeMethod(FrameworkMethod method) throws Throwable {165            int paramCount = method.getMethod().getParameterTypes().length;166            method.invokeExplosively(null, paramCount == 0 ? (Object[]) null : parameters);167        }168    }169    @Override170    protected Annotation[] getRunnerAnnotations() {171        Annotation[] allAnnotations = super.getRunnerAnnotations();172        Annotation[] annotationsWithoutRunWith = new Annotation[allAnnotations.length - 1];173        int i = 0;174        for (Annotation annotation: allAnnotations) {175            if (!annotation.annotationType().equals(RunWith.class)) {176                annotationsWithoutRunWith[i] = annotation;177                ++i;178            }179        }180        return annotationsWithoutRunWith;181    }182    private List<FrameworkField> getAnnotatedFieldsByParameter() {183        return getTestClass().getAnnotatedFields(Parameter.class);184    }185    private InjectionType getInjectionType() {186        if (fieldsAreAnnotated()) {187            return InjectionType.FIELD;188        } else {189            return InjectionType.CONSTRUCTOR;190        }191    }192    private boolean fieldsAreAnnotated() {193        return !getAnnotatedFieldsByParameter().isEmpty();194    }195}...

Source:InjectingParameterExtension.java

1package uk.ac.ox.cs.refactoring.benchmarks.resources;2import java.lang.annotation.Annotation;3import java.lang.reflect.Field;4import java.util.List;5import java.util.function.BiFunction;6import java.util.function.Predicate;7import org.junit.jupiter.api.extension.BeforeAllCallback;8import org.junit.jupiter.api.extension.BeforeEachCallback;9import org.junit.jupiter.api.extension.ExtensionContext;10import org.junit.jupiter.api.extension.ParameterContext;11import org.junit.jupiter.api.extension.ParameterResolutionException;12import org.junit.jupiter.api.extension.ParameterResolver;13import org.junit.platform.commons.util.AnnotationUtils;14import org.junit.platform.commons.util.ReflectionUtils;15/**16 * Configurable JUnit 5 parameter injection helper. Implements17 * {@link BeforeAllCallback}, {@link BeforeEachCallback} and18 * {@link ParameterResolver} by injecting values provided by a configurable19 * value factory if a parameter or field is annotated with a configurable20 * annotation type.21 *22 * @param <AnnotationType>23 *          Fields or parameters with an annotation of this type will have a24 *          value injected.25 */26public class InjectingParameterExtension<ValueType, AnnotationType extends Annotation>27    implements BeforeAllCallback, BeforeEachCallback, ParameterResolver {28  /**29   * Type of the annotation for which to inject values.30   */31  private final Class<AnnotationType> annotationType;32  /**33   * For a given {@link ExtensionContext} (i.e. lifetime) and34   * {@link #annotationType AnnotationType} this provided value factory produces35   * values to inject.36   */37  private final BiFunction<ExtensionContext, AnnotationType, ValueType> valueFactory;38  /**39   * Type of the values injected into fields and parameters.40   */41  private final Class<ValueType> valueType;42  /**43   * @param annotationType44   *          {@link #annotationType}45   * @param valueFactory46   *          {@link #valueFactory}47   * @param valueType48   *          {@link #valueType}49   */50  public InjectingParameterExtension(final Class<AnnotationType> annotationType,51      final BiFunction<ExtensionContext, AnnotationType, ValueType> valueFactory,52      final Class<ValueType> valueType) {53    this.annotationType = annotationType;54    this.valueFactory = valueFactory;55    this.valueType = valueType;56  }57  @Override58  public void beforeAll(final ExtensionContext context)59      throws IllegalAccessException {60    inject(context, true);61  }62  @Override63  public void beforeEach(final ExtensionContext context)64      throws IllegalAccessException {65    inject(context, false);66  }67  /**68   * Reflectively checks for each field in the test class if it is annotated69   * with {@link #annotationType} and if so constructs a value using70   * {{@link #valueFactory} and reflectively assignes it to the field.71   *72   * @param extensionContext73   *          Used to look up test class and test instance.74   * @param isStatic75   *          <code>true</code> if only static fields should be considered,76   *          <code>false</code> if only instance fields should be considered.77   * @throws IllegalAccessException78   *           if a reflective access fails.79   */80  private void inject(final ExtensionContext extensionContext,81      final boolean isStatic) throws IllegalAccessException {82    final Predicate<Field> predicate = isStatic ? ReflectionUtils::isStatic83        : ReflectionUtils::isNotStatic;84    final Object testInstance = isStatic ? null85        : extensionContext.getRequiredTestInstance();86    final List<Field> fields = AnnotationUtils.findAnnotatedFields(87        extensionContext.getRequiredTestClass(), annotationType, predicate);88    for(final Field field : fields) {89      if (!field.getType().isAssignableFrom(valueType))90        continue;91      final AnnotationType annotation = field.getAnnotation(annotationType);92      if (annotation == null)93        continue;94      final Object value = valueFactory.apply(extensionContext, annotation);95      field.setAccessible(true);96      field.set(testInstance, value);97    }98  }99  @Override100  public Object resolveParameter(final ParameterContext parameterContext,101      final ExtensionContext extensionContext)102      throws ParameterResolutionException {103    final AnnotationType annotation = parameterContext.getParameter()104        .getAnnotation(annotationType);105    return valueFactory.apply(extensionContext, annotation);106  }107  @Override108  public boolean supportsParameter(final ParameterContext parameterContext,109      final ExtensionContext extensionContext) {110    return parameterContext.getParameter().getType().isAssignableFrom(valueType)111        && parameterContext.isAnnotated(annotationType);112  }113}...

Source:LifecycleMethodUtils.java

1/*2 * Copyright 2015-2019 the original author or authors.3 *4 * All rights reserved. This program and the accompanying materials are5 * made available under the terms of the Eclipse Public License v2.0 which6 * accompanies this distribution and is available at7 *8 * https://www.eclipse.org/legal/epl-v20.html9 */10package org.junit.jupiter.engine.descriptor;11import static org.junit.platform.commons.util.AnnotationUtils.findAnnotatedMethods;12import static org.junit.platform.commons.util.ReflectionUtils.returnsVoid;13import java.lang.annotation.Annotation;14import java.lang.reflect.Method;15import java.util.List;16import org.junit.jupiter.api.AfterAll;17import org.junit.jupiter.api.AfterEach;18import org.junit.jupiter.api.BeforeAll;19import org.junit.jupiter.api.BeforeEach;20import org.junit.platform.commons.JUnitException;21import org.junit.platform.commons.util.ReflectionUtils;22import org.junit.platform.commons.util.ReflectionUtils.HierarchyTraversalMode;23/**24 * Collection of utilities for working with test lifecycle methods.25 *26 * @since 5.027 */28final class LifecycleMethodUtils {29	private LifecycleMethodUtils() {30		/* no-op */31	}32	static List<Method> findBeforeAllMethods(Class<?> testClass, boolean requireStatic) {33		return findMethodsAndAssertStatic(testClass, requireStatic, BeforeAll.class, HierarchyTraversalMode.TOP_DOWN);34	}35	static List<Method> findAfterAllMethods(Class<?> testClass, boolean requireStatic) {36		return findMethodsAndAssertStatic(testClass, requireStatic, AfterAll.class, HierarchyTraversalMode.BOTTOM_UP);37	}38	static List<Method> findBeforeEachMethods(Class<?> testClass) {39		return findMethodsAndAssertNonStatic(testClass, BeforeEach.class, HierarchyTraversalMode.TOP_DOWN);40	}41	static List<Method> findAfterEachMethods(Class<?> testClass) {42		return findMethodsAndAssertNonStatic(testClass, AfterEach.class, HierarchyTraversalMode.BOTTOM_UP);43	}44	private static void assertStatic(Class<? extends Annotation> annotationType, Method method) {45		if (ReflectionUtils.isNotStatic(method)) {46			throw new JUnitException(String.format(47				"@%s method '%s' must be static unless the test class is annotated with @TestInstance(Lifecycle.PER_CLASS).",48				annotationType.getSimpleName(), method.toGenericString()));49		}50	}51	private static void assertNonStatic(Class<? extends Annotation> annotationType, Method method) {52		if (ReflectionUtils.isStatic(method)) {53			throw new JUnitException(String.format("@%s method '%s' must not be static.",54				annotationType.getSimpleName(), method.toGenericString()));55		}56	}57	private static void assertVoid(Class<? extends Annotation> annotationType, Method method) {58		if (!returnsVoid(method)) {59			throw new JUnitException(String.format("@%s method '%s' must not return a value.",60				annotationType.getSimpleName(), method.toGenericString()));61		}62	}63	private static List<Method> findMethodsAndAssertStatic(Class<?> testClass, boolean requireStatic,64			Class<? extends Annotation> annotationType, HierarchyTraversalMode traversalMode) {65		List<Method> methods = findMethodsAndCheckVoidReturnType(testClass, annotationType, traversalMode);66		if (requireStatic) {67			methods.forEach(method -> assertStatic(annotationType, method));68		}69		return methods;70	}71	private static List<Method> findMethodsAndAssertNonStatic(Class<?> testClass,72			Class<? extends Annotation> annotationType, HierarchyTraversalMode traversalMode) {73		List<Method> methods = findMethodsAndCheckVoidReturnType(testClass, annotationType, traversalMode);74		methods.forEach(method -> assertNonStatic(annotationType, method));75		return methods;76	}77	private static List<Method> findMethodsAndCheckVoidReturnType(Class<?> testClass,78			Class<? extends Annotation> annotationType, HierarchyTraversalMode traversalMode) {79		List<Method> methods = findAnnotatedMethods(testClass, annotationType, traversalMode);80		methods.forEach(method -> assertVoid(annotationType, method));81		return methods;82	}83}...

Source:TestTypeConstants.java

1package org.moreunit.preferences;2import java.util.HashMap;3import java.util.Map;4public class TestTypeConstants5{6    public static final Map<String, String> BEFORE_CLASS_METHOD_ANNOTATION = new HashMap<String, String>();7    public static final Map<String, String> BEFORE_METHOD_ANNOTATION = new HashMap<String, String>();8    public static final Map<String, String> TEARDOWN_METHOD_ANNOTATION = new HashMap<String, String>();9    public static final Map<String, String> AFTER_CLASS_METHOD_ANNOTATION = new HashMap<String, String>();10    public static final Map<String, String> TEST_ANNOTATION = new HashMap<String, String>();11    public static final Map<String, String> STATIC_IMPORT_BASE_CLASS = new HashMap<String, String>();12    static13    {14        BEFORE_CLASS_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_4, "org.junit.BeforeClass"); //$NON-NLS-1$15        BEFORE_CLASS_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_5, "org.junit.jupiter.api.BeforeAll"); //$NON-NLS-1$16        BEFORE_CLASS_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_TESTNG, "org.testng.annotations.BeforeClass"); //$NON-NLS-1$17        BEFORE_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_4, "org.junit.Before"); //$NON-NLS-1$18        BEFORE_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_5, "org.junit.jupiter.api.BeforeEach"); //$NON-NLS-1$19        BEFORE_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_TESTNG, "org.testng.annotations.BeforeMethod"); //$NON-NLS-1$20        TEARDOWN_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_4, "org.junit.After"); //$NON-NLS-1$21        TEARDOWN_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_5, "org.junit.jupiter.api.AfterEach"); //$NON-NLS-1$22        TEARDOWN_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_TESTNG, "org.testng.annotations.AfterMethod"); //$NON-NLS-1$23        AFTER_CLASS_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_4, "org.junit.AfterClass"); //$NON-NLS-1$24        AFTER_CLASS_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_5, "org.junit.jupiter.api.AfterAll"); //$NON-NLS-1$25        AFTER_CLASS_METHOD_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_TESTNG, "org.testng.annotations.AfterClass"); //$NON-NLS-1$26        TEST_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_4, "org.junit.Test"); //$NON-NLS-1$27        TEST_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_5, "org.junit.jupiter.api.Test"); //$NON-NLS-1$28        TEST_ANNOTATION.put(PreferenceConstants.TEST_TYPE_VALUE_TESTNG, "org.testng.annotations.Test"); //$NON-NLS-1$29        STATIC_IMPORT_BASE_CLASS.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_4, "org.junit.Assert"); //$NON-NLS-1$30        STATIC_IMPORT_BASE_CLASS.put(PreferenceConstants.TEST_TYPE_VALUE_JUNIT_5, "org.junit.jupiter.api.Assertions"); //$NON-NLS-1$31        STATIC_IMPORT_BASE_CLASS.put(PreferenceConstants.TEST_TYPE_VALUE_TESTNG, "org.testng.Assert"); //$NON-NLS-1$32    }33}...

Source:KubernetesExtension.java

1/*2 * Copyright 2019-2019 the original author or authors.3 *4 * Licensed under the Apache License, Version 2.0 (the "License");5 * you may not use this file except in compliance with the License.6 * You may obtain a copy of the License at7 *8 *      https://www.apache.org/licenses/LICENSE-2.09 *10 * Unless required by applicable law or agreed to in writing, software11 * distributed under the License is distributed on an "AS IS" BASIS,12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.13 * See the License for the specific language governing permissions and14 * limitations under the License.15 */16package org.springframework.cloud.kubernetes.discovery.support;17import java.lang.annotation.ElementType;18import java.lang.annotation.Retention;19import java.lang.annotation.RetentionPolicy;20import java.lang.annotation.Target;21import io.fabric8.kubernetes.client.KubernetesClient;22import io.fabric8.kubernetes.client.server.mock.KubernetesServer;23import org.junit.jupiter.api.extension.AfterEachCallback;24import org.junit.jupiter.api.extension.BeforeEachCallback;25import org.junit.jupiter.api.extension.ExtensionContext;26import org.junit.jupiter.api.extension.ParameterContext;27import org.junit.jupiter.api.extension.ParameterResolutionException;28import org.junit.jupiter.api.extension.ParameterResolver;29/**30 * @author Tim Ysewyn31 */32public class KubernetesExtension33		implements ParameterResolver, BeforeEachCallback, AfterEachCallback {34	private final KubernetesServer mockServer = new KubernetesServer();35	@Override36	public boolean supportsParameter(ParameterContext parameterContext,37			ExtensionContext context) {38		return (parameterContext.getParameter().isAnnotationPresent(Server.class)39				&& KubernetesServer.class40						.isAssignableFrom(parameterContext.getParameter().getType()))41				|| (parameterContext.getParameter().isAnnotationPresent(Client.class)42						&& KubernetesClient.class.isAssignableFrom(43								parameterContext.getParameter().getType()));44	}45	@Override46	public void beforeEach(ExtensionContext context) throws Exception {47		mockServer.before();48	}49	@Override50	public void afterEach(ExtensionContext context) throws Exception {51		mockServer.after();52	}53	@Override54	public Object resolveParameter(ParameterContext parameterContext,55			ExtensionContext extensionContext) throws ParameterResolutionException {56		if (parameterContext.getParameter().isAnnotationPresent(Client.class)) {57			return mockServer.getClient();58		}59		else {60			return mockServer;61		}62	}63	/**64	 * Enables injection of kubernetes server to test.65	 */66	@Target({ ElementType.PARAMETER })67	@Retention(RetentionPolicy.RUNTIME)68	public @interface Server {69	}70	/**71	 * Enables injection of kubernetes client to test.72	 */73	@Target({ ElementType.PARAMETER })74	@Retention(RetentionPolicy.RUNTIME)75	public @interface Client {76	}77}...

Source:CategoryValidator.java

1package org.junit.experimental.categories;2import static java.util.Arrays.asList;3import static java.util.Collections.unmodifiableList;4import static java.util.Collections.unmodifiableSet;5import java.lang.annotation.Annotation;6import java.util.ArrayList;7import java.util.HashSet;8import java.util.List;9import java.util.Set;10import org.junit.After;11import org.junit.AfterClass;12import org.junit.Before;13import org.junit.BeforeClass;14import org.junit.runners.model.FrameworkMethod;15import org.junit.validator.AnnotationValidator;16/**17 * Validates that there are no errors in the use of the {@code Category}18 * annotation. If there is, a {@code Throwable} object will be added to the list19 * of errors.20 *21 * @since 4.1222 */23public final class CategoryValidator extends AnnotationValidator {24    @SuppressWarnings("unchecked")25    private static final Set<Class<? extends Annotation>> INCOMPATIBLE_ANNOTATIONS = unmodifiableSet(new HashSet<Class<? extends Annotation>>(26            asList(BeforeClass.class, AfterClass.class, Before.class, After.class)));27    /**28     * Adds to {@code errors} a throwable for each problem detected. Looks for29     * {@code BeforeClass}, {@code AfterClass}, {@code Before} and {@code After}30     * annotations.31     *32     * @param method the method that is being validated33     * @return A list of exceptions detected34     *35     * @since 4.1236     */37    @Override38    public List<Exception> validateAnnotatedMethod(FrameworkMethod method) {39        List<Exception> errors = new ArrayList<Exception>();40        Annotation[] annotations = method.getAnnotations();41        for (Annotation annotation : annotations) {42            for (Class<?> clazz : INCOMPATIBLE_ANNOTATIONS) {43                if (annotation.annotationType().isAssignableFrom(clazz)) {44                    addErrorMessage(errors, clazz);45                }46            }47        }48        return unmodifiableList(errors);49    }50    private void addErrorMessage(List<Exception> errors, Class<?> clazz) {51        String message = String.format("@%s can not be combined with @Category",52                clazz.getSimpleName());53        errors.add(new Exception(message));54    }55}...

Source:After.java

1package org.junit;2import java.lang.annotation.ElementType;3import java.lang.annotation.Retention;4import java.lang.annotation.RetentionPolicy;5import java.lang.annotation.Target;6/**7 * If you allocate external resources in a {@link org.junit.Before} method you need to release them8 * after the test runs. Annotating a <code>public void</code> method9 * with <code>&#064;After</code> causes that method to be run after the {@link org.junit.Test} method. All <code>&#064;After</code>10 * methods are guaranteed to run even if a {@link org.junit.Before} or {@link org.junit.Test} method throws an11 * exception. The <code>&#064;After</code> methods declared in superclasses will be run after those of the current12 * class, unless they are overridden in the current class.13 * <p>14 * Here is a simple example:15 * <pre>16 * public class Example {17 *    File output;18 *    &#064;Before public void createOutputFile() {19 *          output= new File(...);20 *    }21 *    &#064;Test public void something() {22 *          ...23 *    }24 *    &#064;After public void deleteOutputFile() {25 *          output.delete();26 *    }27 * }28 * </pre>29 *30 * @see org.junit.Before31 * @see org.junit.Test32 * @since 4.033 */34@Retention(RetentionPolicy.RUNTIME)35@Target(ElementType.METHOD)36public @interface After {37}...

Source:Before.java

1package org.junit;2import java.lang.annotation.ElementType;3import java.lang.annotation.Retention;4import java.lang.annotation.RetentionPolicy;5import java.lang.annotation.Target;6/**7 * When writing tests, it is common to find that several tests need similar8 * objects created before they can run. Annotating a <code>public void</code> method9 * with <code>&#064;Before</code> causes that method to be run before the {@link org.junit.Test} method.10 * The <code>&#064;Before</code> methods of superclasses will be run before those of the current class,11 * unless they are overridden in the current class. No other ordering is defined.12 * <p>13 * Here is a simple example:14 * <pre>15 * public class Example {16 *    List empty;17 *    &#064;Before public void initialize() {18 *       empty= new ArrayList();19 *    }20 *    &#064;Test public void size() {21 *       ...22 *    }23 *    &#064;Test public void remove() {24 *       ...25 *    }26 * }27 * </pre>28 *29 * @see org.junit.BeforeClass30 * @see org.junit.After31 * @since 4.032 */33@Retention(RetentionPolicy.RUNTIME)34@Target(ElementType.METHOD)35public @interface Before {36}...

Annotation Type Before

Using AI Code Generation

1import org.junit.BeforeClass;2import org.junit.AfterClass;3import org.junit.Test;4import org.junit.Ignore;5import org.junit.Rule;6import org.junit.ClassRule;7import org.junit.Before;8import org.junit.After;9import org.junit.BeforeClass;10import org.junit.AfterClass;11import org.junit.Test;12import org.junit.Ignore;13import org.junit.Rule;14import org.junit.ClassRule;15import org.junit.Before;16import org.junit.After;17import org.junit.BeforeClass;18import org.junit.AfterClass;19import org.junit.Test;20import org.junit.Ignore;21import org.junit.Rule;22import org.junit.ClassRule;23import org.junit.Before;24import org.junit.After;25import org.junit.BeforeClass;26import org.junit.AfterClass;27import org.junit.Test;28import org.junit.Ignore;29import

Annotation Type Before

Using AI Code Generation

1package com.java2novice.junit;2import org.junit.BeforeClass;3import org.junit.Test;4import static org.junit.Assert.assertEquals;5public class MyFirstJUnit5Test {6    public static void setUp() {7        System.out.println("Before Class");8    }9    public void testAdd() {10        String str = "Junit is working fine";11        assertEquals("Junit is working fine", str);12    }13}

Annotation Type Before

Using AI Code Generation

1public void before() {2    System.out.println("Before");3}4public void after() {5    System.out.println("After");6}7public void test() {8    System.out.println("Test");9}10public void ignored() {11    System.out.println("Ignored");12}13public void test2() {14    System.out.println("Test2");15}16public void test3() {17    System.out.println("Test3");18}19public void test4() {20    System.out.println("Test4");21}22public void test5() {23    System.out.println("Test5");24}25public void test6() {26    System.out.println("Test6");27}28public void test7() {29    System.out.println("Test7");30}31public void test8() {32    System.out.println("Test8");33}34public void test9() {35    System.out.println("Test9");36}

Annotation Type Before

Using AI Code Generation

1public void setUp() {2    calculator = new Calculator();3}4public void testAdd() {5    assertEquals(5, calculator.add(2, 3));6}7public void testSubstract() {8    assertEquals(2, calculator.subtract(5, 3));9}10public void testMultiply() {11    assertEquals(6, calculator.multiply(2, 3));12}13public void testDivide() {14    assertEquals(2, calculator.divide(6, 3));15}16public void tearDown() {17    calculator = null;18}19}20@RunWith(JUnit4.class)21public class CalculatorTest {

Source: How to implement REST token-based authentication with JAX-RS and Jersey

1/**2 * Generate a random hex encoded string token of the specified length3 *  4 * @param length5 * @return random hex string6 */7public static synchronized String generateUniqueToken(Integer length){ 8    byte random[] = new byte[length];9    Random randomGenerator = new Random();10    StringBuffer buffer = new StringBuffer();1112    randomGenerator.nextBytes(random);1314    for (int j = 0; j < random.length; j++) {15        byte b1 = (byte) ((random[j] & 0xf0) >> 4);16        byte b2 = (byte) (random[j] & 0x0f);17        if (b1 < 10)18            buffer.append((char) ('0' + b1));19        else20            buffer.append((char) ('A' + (b1 - 10)));21        if (b2 < 10)22            buffer.append((char) ('0' + b2));23        else24            buffer.append((char) ('A' + (b2 - 10)));25    }26    return (buffer.toString());27}2829@Test30public void testGenerateUniqueToken(){31    Set set = new HashSet();32    String token = null;33    int size = 16;3435    /* Seems like we should be able to generate 500K tokens 36     * without a duplicate 37     */38    for (int i=0; i<500000; i++){39        token = Utility.generateUniqueToken(size);4041        if (token.length() != size * 2){42            fail("Incorrect length");43        } else if (set.contains(token)) {44            fail("Duplicate token generated");45        } else{46            set.add(token);47        }48    }49}50

Source:How to implement REST token-based authentication with JAX-RS and Jersey

/**
 * Generate a random hex encoded string token of the specified length
 *  
 * @param length
 * @return random hex string
 */
public static synchronized String generateUniqueToken(Integer length){ 
    byte random[] = new byte[length];
    Random randomGenerator = new Random();
    StringBuffer buffer = new StringBuffer();

    randomGenerator.nextBytes(random);

    for (int j = 0; j < random.length; j++) {
        byte b1 = (byte) ((random[j] & 0xf0) >> 4);
        byte b2 = (byte) (random[j] & 0x0f);
        if (b1 < 10)
            buffer.append((char) ('0' + b1));
        else
            buffer.append((char) ('A' + (b1 - 10)));
        if (b2 < 10)
            buffer.append((char) ('0' + b2));
        else
            buffer.append((char) ('A' + (b2 - 10)));
    }
    return (buffer.toString());
}

@Test
public void testGenerateUniqueToken(){
    Set set = new HashSet();
    String token = null;
    int size = 16;

    /* Seems like we should be able to generate 500K tokens 
     * without a duplicate 
     */
    for (int i=0; i<500000; i++){
        token = Utility.generateUniqueToken(size);

        if (token.length() != size * 2){
            fail("Incorrect length");
        } else if (set.contains(token)) {
            fail("Duplicate token generated");
        } else{
            set.add(token);
        }
    }
}

Source: Bytecode features not available in the Java language

1public static String getRandomString(int length) {2    final String characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJLMNOPQRSTUVWXYZ1234567890!@#$%^&*()_+";3    StringBuilder result = new StringBuilder();45    while(length > 0) {6        Random rand = new Random();7        result.append(characters.charAt(rand.nextInt(characters.length())));8        length--;9    }10    return result.toString();11}12

Source:Bytecode features not available in the Java language

public static String getRandomString(int length) {
    final String characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJLMNOPQRSTUVWXYZ1234567890!@#$%^&*()_+";
    StringBuilder result = new StringBuilder();

    while(length > 0) {
        Random rand = new Random();
        result.append(characters.charAt(rand.nextInt(characters.length())));
        length--;
    }
    return result.toString();
}

Source: Difference between @Mock, @MockBean and Mockito.mock()

1import java.util.Date;2import java.util.Random;34public class RandomGenerator {56  private static Random random = new Random((new Date()).getTime());78    public static String generateRandomString(int length) {9      char[] values = {'a','b','c','d','e','f','g','h','i','j',10               'k','l','m','n','o','p','q','r','s','t',11               'u','v','w','x','y','z','0','1','2','3',12               '4','5','6','7','8','9'};1314      String out = "";1516      for (int i=0;i<length;i++) {17          int idx=random.nextInt(values.length);18          out += values[idx];19      }20      return out;21    }22}23

Source:Difference between @Mock, @MockBean and Mockito.mock()

import java.util.Date;
import java.util.Random;

public class RandomGenerator {

  private static Random random = new Random((new Date()).getTime());

    public static String generateRandomString(int length) {
      char[] values = {'a','b','c','d','e','f','g','h','i','j',
               'k','l','m','n','o','p','q','r','s','t',
               'u','v','w','x','y','z','0','1','2','3',
               '4','5','6','7','8','9'};

      String out = "";

      for (int i=0;i<length;i++) {
          int idx=random.nextInt(values.length);
          out += values[idx];
      }
      return out;
    }
}

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.