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Best junit code snippet using org.junit.runners.parameterized.Interface ParametersRunnerFactory
Source: Parameterized.java
1/* */ package org.junit.runners;2/* */ 3/* */ import java.lang.annotation.ElementType;4/* */ import java.lang.annotation.Inherited;5/* */ import java.lang.annotation.Retention;6/* */ import java.lang.annotation.RetentionPolicy;7/* */ import java.lang.annotation.Target;8/* */ import java.text.MessageFormat;9/* */ import java.util.ArrayList;10/* */ import java.util.Arrays;11/* */ import java.util.Collections;12/* */ import java.util.List;13/* */ import org.junit.runner.Runner;14/* */ import org.junit.runners.model.FrameworkMethod;15/* */ import org.junit.runners.model.InitializationError;16/* */ import org.junit.runners.model.TestClass;17/* */ import org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParametersFactory;18/* */ import org.junit.runners.parameterized.ParametersRunnerFactory;19/* */ import org.junit.runners.parameterized.TestWithParameters;20/* */ 21/* */ 22/* */ 23/* */ 24/* */ 25/* */ 26/* */ 27/* */ 28/* */ 29/* */ 30/* */ 31/* */ 32/* */ 33/* */ 34/* */ 35/* */ 36/* */ 37/* */ 38/* */ 39/* */ 40/* */ 41/* */ 42/* */ 43/* */ 44/* */ 45/* */ 46/* */ 47/* */ 48/* */ 49/* */ 50/* */ 51/* */ 52/* */ 53/* */ 54/* */ 55/* */ 56/* */ 57/* */ 58/* */ 59/* */ 60/* */ 61/* */ 62/* */ 63/* */ 64/* */ 65/* */ 66/* */ 67/* */ 68/* */ 69/* */ 70/* */ 71/* */ 72/* */ 73/* */ 74/* */ 75/* */ 76/* */ 77/* */ 78/* */ 79/* */ 80/* */ 81/* */ 82/* */ 83/* */ 84/* */ 85/* */ 86/* */ 87/* */ 88/* */ 89/* */ 90/* */ 91/* */ 92/* */ 93/* */ 94/* */ 95/* */ 96/* */ 97/* */ 98/* */ 99/* */ 100/* */ 101/* */ 102/* */ 103/* */ 104/* */ 105/* */ 106/* */ 107/* */ 108/* */ 109/* */ 110/* */ 111/* */ 112/* */ 113/* */ 114/* */ 115/* */ 116/* */ 117/* */ 118/* */ 119/* */ 120/* */ 121/* */ 122/* */ 123/* */ 124/* */ 125/* */ 126/* */ 127/* */ 128/* */ 129/* */ 130/* */ 131/* */ 132/* */ 133/* */ 134/* */ 135/* */ 136/* */ 137/* */ 138/* */ 139/* */ 140/* */ 141/* */ 142/* */ 143/* */ 144/* */ 145/* */ 146/* */ 147/* */ 148/* */ 149/* */ 150/* */ 151/* */ 152/* */ 153/* */ 154/* */ 155/* */ 156/* */ 157/* */ 158/* */ 159/* */ 160/* */ 161/* */ 162/* */ 163/* */ 164/* */ 165/* */ 166/* */ 167/* */ 168/* */ 169/* */ 170/* */ 171/* */ 172/* */ 173/* */ 174/* */ 175/* */ 176/* */ 177/* */ 178/* */ 179/* */ 180/* */ 181/* */ 182/* */ 183/* */ 184/* */ 185/* */ 186/* */ 187/* */ 188/* */ 189/* */ 190/* */ 191/* */ 192/* */ 193/* */ 194/* */ 195/* */ 196/* */ 197/* */ 198/* */ 199/* */ 200/* */ 201/* */ 202/* */ 203/* */ 204/* */ 205/* */ 206/* */ 207/* */ 208/* */ 209/* */ 210/* */ 211/* */ 212/* */ 213/* */ 214/* */ 215/* */ 216/* */ 217/* */ 218/* */ 219/* */ 220/* */ 221/* */ 222/* */ 223/* */ 224/* */ 225/* */ 226/* */ 227/* */ 228/* */ 229/* */ 230/* */ public class Parameterized231/* */ extends Suite232/* */ {233/* 233 */ private static final ParametersRunnerFactory DEFAULT_FACTORY = (ParametersRunnerFactory)new BlockJUnit4ClassRunnerWithParametersFactory();234/* */ 235/* 235 */ private static final List<Runner> NO_RUNNERS = Collections.emptyList();236/* */ 237/* */ 238/* */ private final List<Runner> runners;239/* */ 240/* */ 241/* */ 242/* */ public Parameterized(Class<?> klass) throws Throwable {243/* 243 */ super(klass, NO_RUNNERS);244/* 244 */ ParametersRunnerFactory runnerFactory = getParametersRunnerFactory(klass);245/* */ 246/* 246 */ Parameters parameters = (Parameters)getParametersMethod().getAnnotation(Parameters.class);247/* */ 248/* 248 */ this.runners = Collections.unmodifiableList(createRunnersForParameters(allParameters(), parameters.name(), runnerFactory));249/* */ }250/* */ 251/* */ 252/* */ 253/* */ private ParametersRunnerFactory getParametersRunnerFactory(Class<?> klass) throws InstantiationException, IllegalAccessException {254/* 254 */ UseParametersRunnerFactory annotation = klass.<UseParametersRunnerFactory>getAnnotation(UseParametersRunnerFactory.class);255/* */ 256/* 256 */ if (annotation == null) {257/* 257 */ return DEFAULT_FACTORY;258/* */ }259/* 259 */ Class<? extends ParametersRunnerFactory> factoryClass = annotation.value();260/* */ 261/* 261 */ return factoryClass.newInstance();262/* */ }263/* */ 264/* */ 265/* */ 266/* */ protected List<Runner> getChildren() {267/* 267 */ return this.runners;268/* */ }269/* */ 270/* */ 271/* */ private TestWithParameters createTestWithNotNormalizedParameters(String pattern, int index, Object parametersOrSingleParameter) {272/* 272 */ (new Object[1])[0] = parametersOrSingleParameter; Object[] parameters = (parametersOrSingleParameter instanceof Object[]) ? (Object[])parametersOrSingleParameter : new Object[1];273/* */ 274/* 274 */ return createTestWithParameters(getTestClass(), pattern, index, parameters);275/* */ }276/* */ 277/* */ 278/* */ 279/* */ private Iterable<Object> allParameters() throws Throwable {280/* 280 */ Object parameters = getParametersMethod().invokeExplosively(null, new Object[0]);281/* 281 */ if (parameters instanceof Iterable)282/* 282 */ return (Iterable<Object>)parameters; 283/* 283 */ if (parameters instanceof Object[]) {284/* 284 */ return Arrays.asList((Object[])parameters);285/* */ }286/* 286 */ throw parametersMethodReturnedWrongType();287/* */ }288/* */ 289/* */ 290/* */ private FrameworkMethod getParametersMethod() throws Exception {291/* 291 */ List<FrameworkMethod> methods = getTestClass().getAnnotatedMethods(Parameters.class);292/* */ 293/* 293 */ for (FrameworkMethod each : methods) {294/* 294 */ if (each.isStatic() && each.isPublic()) {295/* 295 */ return each;296/* */ }297/* */ } 298/* */ 299/* 299 */ throw new Exception("No public static parameters method on class " + getTestClass().getName());300/* */ }301/* */ 302/* */ 303/* */ 304/* */ 305/* */ 306/* */ 307/* */ private List<Runner> createRunnersForParameters(Iterable<Object> allParameters, String namePattern, ParametersRunnerFactory runnerFactory) throws InitializationError, Exception {308/* */ try {309/* 309 */ List<TestWithParameters> tests = createTestsForParameters(allParameters, namePattern);310/* */ 311/* 311 */ List<Runner> runners = new ArrayList<Runner>();312/* 312 */ for (TestWithParameters test : tests) {313/* 313 */ runners.add(runnerFactory.createRunnerForTestWithParameters(test));314/* */ }315/* */ 316/* 316 */ return runners;317/* 317 */ } catch (ClassCastException e) {318/* 318 */ throw parametersMethodReturnedWrongType();319/* */ } 320/* */ }321/* */ 322/* */ 323/* */ 324/* */ private List<TestWithParameters> createTestsForParameters(Iterable<Object> allParameters, String namePattern) throws Exception {325/* 325 */ int i = 0;326/* 326 */ List<TestWithParameters> children = new ArrayList<TestWithParameters>();327/* 327 */ for (Object parametersOfSingleTest : allParameters) {328/* 328 */ children.add(createTestWithNotNormalizedParameters(namePattern, i++, parametersOfSingleTest));329/* */ }330/* */ 331/* 331 */ return children;332/* */ }333/* */ 334/* */ private Exception parametersMethodReturnedWrongType() throws Exception {335/* 335 */ String className = getTestClass().getName();336/* 336 */ String methodName = getParametersMethod().getName();337/* 337 */ String message = MessageFormat.format("{0}.{1}() must return an Iterable of arrays.", new Object[] { className, methodName });338/* */ 339/* */ 340/* 340 */ return new Exception(message);341/* */ }342/* */ 343/* */ 344/* */ private static TestWithParameters createTestWithParameters(TestClass testClass, String pattern, int index, Object[] parameters) {345/* 345 */ String finalPattern = pattern.replaceAll("\\{index\\}", Integer.toString(index));346/* */ 347/* 347 */ String name = MessageFormat.format(finalPattern, parameters);348/* 348 */ return new TestWithParameters("[" + name + "]", testClass, Arrays.asList(parameters));349/* */ }350/* */ 351/* */ @Retention(RetentionPolicy.RUNTIME)352/* */ @Inherited353/* */ @Target({ElementType.TYPE})354/* */ public static @interface UseParametersRunnerFactory {355/* */ Class<? extends ParametersRunnerFactory> value() default BlockJUnit4ClassRunnerWithParametersFactory.class;356/* */ }357/* */ 358/* */ @Retention(RetentionPolicy.RUNTIME)359/* */ @Target({ElementType.FIELD})360/* */ public static @interface Parameter {361/* */ int value() default 0;362/* */ }363/* */ 364/* */ @Retention(RetentionPolicy.RUNTIME)365/* */ @Target({ElementType.METHOD})366/* */ public static @interface Parameters {367/* */ String name() default "{index}";368/* */ }369/* */ }370/* Location: /home/arpit/Downloads/Picking-Tool-6.5.2.jar!/org/junit/runners/Parameterized.class371 * Java compiler version: 5 (49.0)372 * JD-Core Version: 1.1.3373 */...
Source: CustomParameterizedRunner.java
1/*2 * Copyright (c) 2000, 2020, Oracle and/or its affiliates.3 *4 * Licensed under the Universal Permissive License v 1.0 as shown at5 * http://oss.oracle.com/licenses/upl.6 */7package com.tangosol.coherence.performance;8import org.junit.internal.runners.model.ReflectiveCallable;9import org.junit.internal.runners.statements.Fail;10import org.junit.internal.runners.statements.RunAfters;11import org.junit.internal.runners.statements.RunBefores;12import org.junit.runner.Runner;13import org.junit.runner.notification.RunNotifier;14import org.junit.runners.model.FrameworkMethod;15import org.junit.runners.model.InitializationError;16import org.junit.runners.model.Statement;17import org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParameters;18import org.junit.runners.parameterized.ParametersRunnerFactory;19import org.junit.runners.parameterized.TestWithParameters;20import java.lang.annotation.ElementType;21import java.lang.annotation.Retention;22import java.lang.annotation.RetentionPolicy;23import java.lang.annotation.Target;24import java.util.List;25/**26 * @author jk 2015.11.2627 */28public class CustomParameterizedRunner29 extends BlockJUnit4ClassRunnerWithParameters30 {31 public CustomParameterizedRunner(TestWithParameters test)32 throws InitializationError33 {34 super(test);35 }36 protected Statement classBlock(final RunNotifier notifier)37 {38 Object test;39 try40 {41 test = new ReflectiveCallable()42 {43 @Override44 protected Object runReflectiveCall()45 throws Throwable46 {47 return createTest();48 }49 }.run();50 }51 catch (Throwable e)52 {53 return new Fail(e);54 }55 Statement statement = super.classBlock(notifier);56 statement = withBeforeParameters(statement, test);57 statement = withAfterParameters(statement, test);58 return statement;59 }60 @Override61 public Object createTest()62 throws Exception63 {64 if (m_test == null)65 {66 m_test = super.createTest();67 }68 return m_test;69 }70 protected Statement withBeforeParameters(Statement statement, Object target)71 {72 List<FrameworkMethod> befores = getTestClass().getAnnotatedMethods(BeforeParmeterizedRun.class);73 return befores.isEmpty()74 ? statement75 : new RunBefores(statement, befores, target);76 }77 protected Statement withAfterParameters(Statement statement, Object target)78 {79 List<FrameworkMethod> afters = getTestClass().getAnnotatedMethods(AfterParmeterizedRun.class);80 return afters.isEmpty()81 ? statement82 : new RunAfters(statement, afters, target);83 }84 public static class Factory85 implements ParametersRunnerFactory86 {87 @Override88 public Runner createRunnerForTestWithParameters(TestWithParameters test)89 throws InitializationError90 {91 return new CustomParameterizedRunner(test);92 }93 }94 private Object m_test;95 @Retention(RetentionPolicy.RUNTIME)96 @Target(ElementType.METHOD)97 public @interface BeforeParmeterizedRun98 {99 }100 @Retention(RetentionPolicy.RUNTIME)101 @Target(ElementType.METHOD)102 public @interface AfterParmeterizedRun103 {104 }105 }...
1package org.junit.runners;23import java.lang.annotation.Annotation;4import java.lang.annotation.Inherited;5import java.lang.annotation.Retention;6import java.lang.annotation.RetentionPolicy;7import java.lang.annotation.Target;8import org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParametersFactory;9import org.junit.runners.parameterized.ParametersRunnerFactory;1011@Inherited12@Retention(RetentionPolicy.RUNTIME)13@Target({java.lang.annotation.ElementType.TYPE})14public @interface Parameterized$UseParametersRunnerFactory15{16 Class<? extends ParametersRunnerFactory> value() default BlockJUnit4ClassRunnerWithParametersFactory.class;17}1819
20/* Location: L:\local\mybackup\temp\qq_apk\com.tencent.mobileqq\classes16.jar
21 * Qualified Name: org.junit.runners.Parameterized.UseParametersRunnerFactory
22 * JD-Core Version: 0.7.0.1
...
Source: ParametersRunnerFactory.java
1package org.junit.runners.parameterized;2import org.junit.runner.Runner;3import org.junit.runners.model.InitializationError;4public interface ParametersRunnerFactory {5 Runner createRunnerForTestWithParameters(TestWithParameters paramTestWithParameters) throws InitializationError;6}7/* Location: D:\APPS\yazan\JPBY.jar!\org\junit\runners\parameterized\ParametersRunnerFactory.class8 * Java compiler version: 5 (49.0)9 * JD-Core Version: 1.1.310 */...
Interface ParametersRunnerFactory
Using AI Code Generation
1import org.junit.runner.notification.RunNotifier;2import org.junit.runners.model.FrameworkMethod;3import org.junit.runners.model.InitializationError;4import org.junit.runners.model.RunnerScheduler;5import org.junit.runners.parameterized.ParametersRunnerFactory;6import org.junit.runners.Suite;7import org.junit.runners.Suite.SuiteClasses;8import org.junit.runners.model.RunnerBuilder;9import org.junit.runners.BlockJUnit4ClassRunner;10import org.junit.runners.model.InitializationError;11import org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParameters;12import org.junit.runners.parameterized.TestWithParameters;13import org.junit.runners.parameterized.ParametersRunnerFactory;14import org.junit.runners.parameterized.TestWithParameters;15import org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParameters;16public class ParameterizedTestRunnerFactory implements ParametersRunnerFactory {17 public Runner createRunnerForTestWithParameters(TestWithParameters test) throws InitializationError {18 return new BlockJUnit4ClassRunnerWithParameters(test);19 }20}21@RunWith(Parameterized.class)22@ParametersRunnerFactory(ParameterizedTestRunnerFactory.class)23public class ParameterizedTest {24 @Parameterized.Parameters(name = "{index}: {0}+{1}={2}")25 public static Collection<Object[]> data() {26 return Arrays.asList(new Object[][] { 27 { 1, 1, 2 }, { 2, 2, 4 }, { 8, 2, 10 } 28 });29 }30 @Parameterized.Parameter(0)31 public int fInput;32 @Parameterized.Parameter(1)33 public int fExpected;34 @Parameterized.Parameter(2)35 public int fExpected1;36 public void test() {37 assertEquals(fExpected, fInput + fInput);38 }39}40@RunWith(Parameterized.class)41@ParametersRunnerFactory(ParameterizedTestRunnerFactory.class)42public class ParameterizedTest {43 @Parameterized.Parameters(name = "{index}: {0}+{1}={2}")44 public static Collection<Object[]> data() {45 return Arrays.asList(new Object[][] { 46 { 1, 1, 2 }, { 2, 2, 4 }, { 8, 2, 10 }
Interface ParametersRunnerFactory
Using AI Code Generation
1import org.junit.runners.Parameterized.ParametersRunnerFactory;2import org.junit.runners.Parameterized;3import org.junit.runner.RunWith;4import org.junit.runners.Parameterized.Parameters;5import org.junit.Test;6import static org.junit.Assert.*;7@RunWith(Parameterized.class)8public class TestRunnerFactory {9 private int number;10 public TestRunnerFactory(int number) {11 this.number = number;12 }13 public static ParametersRunnerFactory getParametersRunnerFactory() {14 return new CustomRunnerFactory();15 }16 public static Object[] data() {17 return new Object[] { 5, 15, 25 };18 }19 public void test() {20 assertTrue(number > 0);21 }22}23org.junit.runners.parameterized.ParameterizedTestsRunnerFactoryTest$TestRunnerFactory.getParametersRunnerFactory()24import org.junit.runners.parameterized.ParametersRunnerFactory;25import org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParameters;26import org.junit.runners.parameterized.TestWithParameters;27import org.junit.runner.Runner;28import org.junit.runners.model.RunnerBuilder;29public class CustomRunnerFactory implements ParametersRunnerFactory {30 public Runner createRunnerForTestWithParameters(TestWithParameters test) throws Exception {31 return new BlockJUnit4ClassRunnerWithParameters(test) {32 protected Object createTest() throws Exception {33 return getTestClass().getOnlyConstructor().newInstance(getParameters().get(0));34 }35 };36 }37 public RunnerBuilder withParameters(TestWithParameters parameters) {38 return new RunnerBuilder() {39 public Runner runnerForClass(Class<?> testClass) throws Throwable {40 return new BlockJUnit4ClassRunnerWithParameters(parameters) {41 protected Object createTest() throws Exception {42 return getTestClass().getOnlyConstructor().newInstance(getParameters().get(0));43 }44 };45 }46 };47 }48}49org.junit.runners.parameterized.ParameterizedTestsRunnerFactoryTest$TestRunnerFactory.getParametersRunnerFactory()
Interface ParametersRunnerFactory
Using AI Code Generation
1package com.javacodegeeks.junit;2import java.util.Arrays;3import java.util.Collection;4import org.junit.Test;5import org.junit.runner.RunWith;6import org.junit.runners.Parameterized;7import org.junit.runners.Parameterized.Parameters;8@RunWith(Parameterized.class)9public class ParameterizedTest {10 private int number;11 public ParameterizedTest(int number) {12 this.number = number;13 }14 public static Collection<Object[]> data() {15 Object[][] data = new Object[][] { { 1 }, { 2 }, { 3 }, { 4 } };16 return Arrays.asList(data);17 }18 public void test() {19 System.out.println("Parameterized Number is : " + number);20 }21}
Interface ParametersRunnerFactory
Using AI Code Generation
1public class ParameterizedTest {2 public static RunnerFactory runnerFactory() {3 return new ParameterizedRunnerFactory();4 }5 @Parameters(name = "{index}: {0}")6 public static Collection<Object[]> data() {7 return Arrays.asList(new Object[][]{8 {1, 1, 2},9 {2, 2, 4},10 {8, 2, 10}11 });12 }13 @Parameter(0)14 public int fInput;15 @Parameter(1)16 public int fExpected;17 public void test() {18 assertEquals(fExpected, fInput + fInput);19 }20}21public class Parameterized extends Suite {22 private static class TestClassRunnerForParameters extends TestClassRunner {23 private final int fParameterSetNumber;24 private final List<Object[]> fParameterList;25 TestClassRunnerForParameters(Class<?> type, List<Object[]> parameterList, int i) throws InitializationError {26 super(type);27 fParameterList = parameterList;28 fParameterSetNumber = i;29 }30 protected String getName() {31 return String.format("[%s]", fParameterSetNumber);32 }33 protected String testName(final FrameworkMethod method) {34 return String.format("%s[%s]", method.getName(), fParameterSetNumber);35 }36 protected void validateConstructor(List<Throwable> errors) {37 validateOnlyOneConstructor(errors);38 }39 protected Statement classBlock(RunNotifier notifier) {40 return childrenInvoker(notifier);41 }42 protected Object createTest() throws Exception {43 return getTestClass().getOnlyConstructor().newInstance(computeParams());44 }45 private Object[] computeParams() throws Exception {46 try {47 return fParameterList.get(fParameterSetNumber);48 } catch (ClassCastException e) {49 throw parametersMethodReturnedWrongType();50 }51 }52 private Exception parametersMethodReturnedWrongType() throws Exception {53 String className = getTestClass().getName();54 String methodName = getParametersMethod(getTestClass()).getName();55 return new Exception("Parameters method " + className + "." + methodName + " must return a Collection of arrays.");56 }57 protected Annotation[] getRunnerAnnotations() {58 return new Annotation[0];59 }
Interface ParametersRunnerFactory
Using AI Code Generation
1import org.junit.runner.RunWith;2import org.junit.runners.Parameterized;3import org.junit.runners.Parameterized.Parameters;4import org.junit.runners.Parameterized.Parameter;5import org.junit.runners.Parameterized.ParametersRunnerFactory;6import org.junit.runners.Parameterized.UseParametersRunnerFactory;7import java.util.Arrays;8import java.util.Collection;9import org.junit.Test;10import static org.junit.Assert.assertEquals;11@RunWith(Parameterized.class)12@UseParametersRunnerFactory(ParametersRunnerFactory.class)13public class TestRunnerFactory {14 @Parameter(value = 0)15 public int m1;16 @Parameter(value = 1)17 public int m2;18 @Parameter(value = 2)19 public int result;20 @Parameters(name = "{index}: add({0}+{1})={2}")21 public static Collection<Object[]> data() {22 Object[][] data = new Object[][] { { 1, 1, 2 }, { 5, 3, 8 }, { 121, 4, 125 }, { 11, 11, 22 } };23 return Arrays.asList(data);24 }25 public void test() {26 assertEquals(result, m1 + m2);27 }28}
1<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">2 <xsl:output method="text"/>3 <xsl:template match="/suite">4 <xsl:value-of select="count(test)"/>5 </xsl:template>6</xsl:stylesheet>7
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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