How to use MultipleFailureException class of org.junit.runners.model package

Best junit code snippet using org.junit.runners.model.MultipleFailureException

MultipleFailureExceptionorg.junit.runners.model.MultipleFailureException

It happens when Junit runner recognize many failures and collect them into one.

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...49 }50 };51 }52 /​**53 * Is a given exception (or a MultipleFailureException) an 54 * {@link AssumptionViolatedException}?55 */​56 public static boolean isAssumption(Throwable t) {57 for (Throwable t2 : expandFromMultiple(t)) {58 if (!(t2 instanceof AssumptionViolatedException)) {59 return false;60 }61 }62 return true;63 }64 /​**65 * Expand from multi-exception wrappers.66 */​67 private static List<Throwable> expandFromMultiple(Throwable t) {68 return expandFromMultiple(t, new ArrayList<Throwable>());69 }70 /​** Internal recursive routine. */​71 private static List<Throwable> expandFromMultiple(Throwable t, List<Throwable> list) {72 if (t instanceof org.junit.runners.model.MultipleFailureException) {73 for (Throwable sub : ((org.junit.runners.model.MultipleFailureException) t).getFailures()) {74 expandFromMultiple(sub, list);75 }76 } else {77 list.add(t);78 }79 return list;80 }81 /​**82 * Taints this object and any chained as having failures.83 */​84 public void markFailed() {85 failures = true;86 for (TestRuleMarkFailure next : chained) {87 next.markFailed();...

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1package com.composum.sling.platform.testing.testutil;2import org.junit.internal.AssumptionViolatedException;3import org.junit.rules.MethodRule;4import org.junit.runners.model.FrameworkMethod;5import org.junit.runners.model.MultipleFailureException;6import org.junit.runners.model.Statement;7import org.jetbrains.annotations.NotNull;8import java.util.ArrayList;9import java.util.List;10/​**11 * A rule that allows registering some statements that are executed if the tests fail. This is12 * a {@link MethodRule} since these are executed before e.g. the SlingContext rule, so that we can print stuff13 * before the JCR is cleared.14 */​15public class OnFailureRule implements MethodRule {16 @NotNull17 protected List<ErrorCollectorAlwaysPrintingFailures.TestingRunnableWithException> onFailureActions = new ArrayList<>();18 /​** Register something that should be done on failure - e.g. printing additional debugging information. */​19 public OnFailureRule(ErrorCollectorAlwaysPrintingFailures.TestingRunnableWithException onfailure) {20 this.onFailureActions.add(onfailure);21 }22 @Override23 public Statement apply(Statement base, FrameworkMethod method, Object target) {24 return new Statement() {25 @Override26 public void evaluate() throws Throwable {27 try {28 base.evaluate();29 } catch (AssumptionViolatedException e) {30 throw e;31 } catch (Throwable t) {32 if (t instanceof MultipleFailureException) {33 MultipleFailureException mf = (MultipleFailureException) t;34 runOnFailures(mf.getFailures());35 throw mf;36 }37 List<Throwable> failures = new ArrayList<>();38 failures.add(t);39 runOnFailures(failures);40 MultipleFailureException.assertEmpty(failures);41 throw t;42 }43 }44 };45 }46 /​** Register something that should be done on failure - e.g. printing additional debugging information. */​47 public OnFailureRule onFailure(ErrorCollectorAlwaysPrintingFailures.TestingRunnableWithException onfailure) {48 this.onFailureActions.add(onfailure);49 return this;50 }51 /​**52 * Runs all actions registered with {@link #onFailure(ErrorCollectorAlwaysPrintingFailures.TestingRunnableWithException)} .53 *54 * @param failures here we add any throwables that happen during these actions....

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1package com.accept.qa.testtask.runner;2import org.junit.runners.model.FrameworkMethod;3import org.junit.runners.model.MultipleFailureException;4import org.junit.runners.model.Statement;5import java.util.ArrayList;6import java.util.List;7/​**8 * Implementation of execution after failure.9 * Gives ability to manipulate with failures: Skip, rerun etc...10 *11 * Created by mkhimich on 30.03.2017.12 */​13public class RunAfterFailures extends Statement {14 private Statement nextStatement;15 private List<FrameworkMethod> afterFailures;16 private Object target;17 public RunAfterFailures(Statement statement, List<FrameworkMethod> failures, Object target) {18 this.nextStatement = statement;19 this.afterFailures = failures;20 this.target = target;21 }22 @Override23 public void evaluate() throws Throwable {24 ArrayList<Throwable> errors = new ArrayList<Throwable>();25 try {26 nextStatement.evaluate();27 } catch (Throwable th) {28 errors.add(th);29 for (FrameworkMethod m : afterFailures) {30 try {31 m.invokeExplosively(target, th);32 } catch (Throwable th1) {33 errors.add(th1);34 }35 }36 }37 if (errors.isEmpty()) {38 return;39 }40 if (errors.size() == 1) {41 throw errors.get(0);42 }43 throw new MultipleFailureException(errors);44 }45}...

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...9import java.io.PrintWriter;10import java.io.StringWriter;11import java.util.List;12/​**13 * Custom implementation of {@link org.junit.runners.model.MultipleFailureException} that includes14 * stack information of collected exception as a part of the message.15 */​16public class MultipleFailureException extends org.junit.runners.model.MultipleFailureException {17 public MultipleFailureException(List<Throwable> errors) {18 super(errors);19 }20 @Override21 public String getMessage() {22 StringBuilder sb = new StringBuilder();23 List<Throwable> errors = getFailures();24 sb.append(String.format("There were %d errors:", errors.size()));25 int i = 0;26 for (Throwable e : errors) {27 sb.append(String.format("%n---- Error #%d", i));28 sb.append("\n" + getStackTraceAsString(e));29 i++;30 }31 sb.append("\n");...

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1package org.junit.internal.runners.statements;2import java.util.ArrayList;3import java.util.List;4import org.junit.runners.model.FrameworkMethod;5import org.junit.runners.model.MultipleFailureException;6import org.junit.runners.model.Statement;7public class RunAfters extends Statement {8 private final Statement next;9 private final Object target;10 private final List<FrameworkMethod> afters;11 public RunAfters(Statement next, List<FrameworkMethod> afters, Object target) {12 this.next = next;13 this.afters = afters;14 this.target = target;15 }16 @Override17 public void evaluate() throws Throwable {18 List<Throwable> errors = new ArrayList<Throwable>();19 try {20 next.evaluate();21 } catch (Throwable e) {22 errors.add(e);23 } finally {24 for (FrameworkMethod each : afters) {25 try {26 each.invokeExplosively(target);27 } catch (Throwable e) {28 errors.add(e);29 }30 }31 }32 MultipleFailureException.assertEmpty(errors);33 }34}...

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MultipleFailureException

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1import org.junit.runners.model.MultipleFailureException;2import org.junit.rules.TestRule;3import org.junit.runners.model.Statement;4import org.junit.runner.Description;5import org.junit.rules.TestWatcher;6import org.junit.runner.notification.Failure;7import org.junit.runner.notification.RunNotifier;8import org.junit.runners.model.InitializationError;9import org.junit.runners.BlockJUnit4ClassRunner;10import java.util.ArrayList;11import java.util.List;12public class TestRunner extends BlockJUnit4ClassRunner {13 public TestRunner(Class<?> klass) throws InitializationError {14 super(klass);15 }16 protected List<org.junit.runners.model.FrameworkMethod> computeTestMethods() {17 return super.computeTestMethods();18 }19 protected void runChild(20 RunNotifier notifier) {21 Description description = describeChild(method);22 if (isIgnored(method)) {23 notifier.fireTestIgnored(description);24 } else {25 runLeaf(methodBlock(method), description, notifier);26 }27 }28 private void runLeaf(final Statement statement, Description description,29 final RunNotifier notifier) {30 Statement statement1 = statement(statement, description, notifier);31 runLeaf(statement1, description, notifier);32 }33 private Statement statement(final Statement statement,34 Description description, final RunNotifier notifier) {35 List<Throwable> errors = new ArrayList<Throwable>();36 return statement(errors, statement, description, notifier);37 }38 private Statement statement(final List<Throwable> errors,39 final RunNotifier notifier) {40 Statement statement1 = withPotentialTimeout(statement, description);41 return statement1(errors, statement1, description, notifier);42 }43 private Statement statement1(final List<Throwable> errors,44 final RunNotifier notifier) {45 Statement statement1 = withBefores(description, statement);46 return statement2(errors, statement1, description, notifier);47 }48 private Statement statement2(final List<Throwable> errors,49 final RunNotifier notifier) {50 Statement statement1 = withAfters(description, statement);51 return statement3(errors, statement1, description, notifier);52 }

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MultipleFailureException

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1import org.junit.runner.JUnitCore;2import org.junit.runner.Result;3import org.junit.runner.notification.Failure;4import org.junit.runners.model.MultipleFailureException;5import java.util.List;6public class TestRunner {7 public static void main(String[] args) {8 Result result = JUnitCore.runClasses(TestJunit3.class);9 List<Throwable> failures = result.getFailures();10 if (failures.size() > 0) {11 MultipleFailureException mfe = new MultipleFailureException(failures);12 try {13 throw mfe;14 } catch (MultipleFailureException e) {15 e.printStackTrace();16 }17 }18 System.out.println(result.wasSuccessful());19 }20}211) testAdd(org.TestJunit3)222) testAdd1(org.TestJunit3)23at org.junit.runners.model.MultipleFailureException.assertEmpty(MultipleFailureException.java:67)24at org.junit.runners.model.MultipleFailureException.assertEmpty(MultipleFailureException.java:52)25at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:278)26at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:272)27at java.util.concurrent.FutureTask.run(FutureTask.java:266)28at java.lang.Thread.run(Thread.java:748)29JUnit 4: JUnit 4 @Test(timeout)30JUnit 4: JUnit 4 @Test(expected)

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MultipleFailureException

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1package com.journaldev.junit.exception;2import org.junit.Test;3import org.junit.runner.JUnitCore;4import org.junit.runner.Result;5import org.junit.runner.notification.Failure;6import org.junit.runners.model.MultipleFailureException;7import java.util.Arrays;8import java.util.List;9public class MultipleFailureExceptionTest {10 public void testMultipleFailureException() {11 Result result = JUnitCore.runClasses(TestMultipleFailureException.class);12 System.out.println("Result: "+result.wasSuccessful());13 System.out.println("Failure count: "+result.getFailureCount());14 List<Failure> failures = result.getFailures();15 for (Failure failure : failures) {16 System.out.println(failure.getMessage());17 }18 }19}20package com.journaldev.junit.exception;21import org.junit.Test;22import org.junit.runner.RunWith;23import org.junit.runners.model.MultipleFailureException;24import org.junit.runners.model.TestClass;25import java.util.ArrayList;26import java.util.List;27import static org.junit.Assert.assertEquals;28public class TestMultipleFailureException {29 public void testMultipleFailureException() {30 List<Throwable> failures = new ArrayList<>();31 failures.add(new Throwable("Error 1"));32 failures.add(new Throwable("Error 2"));33 failures.add(new Throwable("Error 3"));34 MultipleFailureException multipleFailureException = new MultipleFailureException(failures);35 assertEquals(3, multipleFailureException.getFailures().size());36 }37}38Multiple Failures (3 failures)39org.junit.runners.model.MultipleFailureException: Multiple Failures (3 failures)40 at org.junit.runners.model.MultipleFailureException.assertEmpty(MultipleFailureException.java:65)41 at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:46)42 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)43 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)44 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)45 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)46 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)47 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

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MultipleFailureException

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1import org.junit.runner.RunWith;2import org.junit.runners.model.MultipleFailureException;3import org.junit.runners.model.Statement;4import org.junit.runners.BlockJUnit4ClassRunner;5import java.util.List;6@RunWith(BlockJUnit4ClassRunner.class)7public class MultipleFailureExceptionTest {8 public static void main(String[] args) {9 org.junit.runner.JUnitCore.main("MultipleFailureExceptionTest");10 }11 public void testMultipleFailureException() {12 org.junit.runners.model.MultipleFailureException multipleFailureException = new org.junit.runners.model.MultipleFailureException(null);13 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Exception);14 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Throwable);15 org.junit.Assert.assertTrue(multipleFailureException instanceof java.io.Serializable);16 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Iterable);17 }18 public void testMultipleFailureException2() {19 java.util.List<java.lang.Throwable> list = new java.util.ArrayList<java.lang.Throwable>();20 org.junit.runners.model.MultipleFailureException multipleFailureException = new org.junit.runners.model.MultipleFailureException(list);21 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Exception);22 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Throwable);23 org.junit.Assert.assertTrue(multipleFailureException instanceof java.io.Serializable);24 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Iterable);25 }26 public void testMultipleFailureException3() {27 java.util.List<java.lang.Throwable> list = new java.util.ArrayList<java.lang.Throwable>();28 org.junit.runners.model.MultipleFailureException multipleFailureException = new org.junit.runners.model.MultipleFailureException(list);29 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Exception);30 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Throwable);31 org.junit.Assert.assertTrue(multipleFailureException instanceof java.io.Serializable);32 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Iterable);33 }34 public void testMultipleFailureException4() {35 java.util.List<java.lang.Throwable> list = new java.util.ArrayList<java.lang.Throwable>();36 org.junit.runners.model.MultipleFailureException multipleFailureException = new org.junit.runners.model.MultipleFailureException(list);37 org.junit.Assert.assertTrue(multipleFailureException instanceof java.lang.Exception);

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MultipleFailureException

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1public class MultipleFailureExceptionTest {2 public void test1() {3 List<Throwable> errors = new ArrayList<>();4 errors.add(new RuntimeException("Error 1"));5 errors.add(new RuntimeException("Error 2"));6 errors.add(new RuntimeException("Error 3"));7 errors.add(new RuntimeException("Error 4"));8 throw new MultipleFailureException(errors);9 }10}11 at org.junit.runners.model.MultipleFailureException.assertEmpty(MultipleFailureException.java:107)12 at org.junit.runners.model.MultipleFailureException.assertEmpty(MultipleFailureException.java:101)13 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:80)14 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)15 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)16 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)17 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)18 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)19 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)20 at org.junit.runners.ParentRunner.run(ParentRunner.java:363)21 at org.junit.runner.JUnitCore.run(JUnitCore.java:137)22 at org.junit.runner.JUnitCore.run(JUnitCore.java:115)23 at org.junit.vintage.engine.execution.RunnerExecutor.execute(RunnerExecutor.java:43)24 at java.base/​java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)25 at java.base/​java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)26 at java.base/​java.util.Iterator.forEachRemaining(Iterator.java:133)27 at java.base/​java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)28 at java.base/​java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)29 at java.base/​java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)30 at java.base/​java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)

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MultipleFailureException

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1public class JUnit4TestRunner {2 public static void main(String[] args) {3 Result result = JUnitCore.runClasses(JUnit4Test.class);4 for (Failure failure : result.getFailures()) {5 System.out.println(failure.toString());6 }7 System.out.println(result.wasSuccessful());8 }9}10import org.junit.Test;11import java.util.Arrays;12import java.util.List;13import static org.junit.Assert.assertEquals;14public class JUnit4Test {15 public void test() {16 List<Integer> expected = Arrays.asList(1, 2, 3);17 List<Integer> actual = Arrays.asList(1, 2, 3);18 assertEquals(expected, actual);19 }20}21 at org.junit.Assert.assertEquals(Assert.java:115)22 at org.junit.Assert.assertEquals(Assert.java:144)23 at JUnit4Test.test(JUnit4Test.java:11)24 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)25 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)26 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)27 at java.lang.reflect.Method.invoke(Method.java:498)28 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)29 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)30 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)31 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)32 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)33 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)34 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)35 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)36 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

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MultipleFailureException

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1@RunWith(JUnit4.class)2public class MultipleFailureExceptionTest {3 private static final String MESSAGE = "Multiple failures";4 private static final List<Throwable> EMPTY_LIST = new ArrayList<Throwable>();5 private static final List<Throwable> LIST_WITH_ONE_ELEMENT = new ArrayList<Throwable>();6 private static final List<Throwable> LIST_WITH_TWO_ELEMENTS = new ArrayList<Throwable>();7 public static void setUp() {8 LIST_WITH_ONE_ELEMENT.add(new Throwable());9 LIST_WITH_TWO_ELEMENTS.add(new Throwable());10 LIST_WITH_TWO_ELEMENTS.add(new Throwable());11 }12 public void testConstructorWithMessageAndEmptyList() {13 try {14 new MultipleFailureException(MESSAGE, EMPTY_LIST);15 fail();16 } catch (IllegalArgumentException e) {17 }18 }19 public void testConstructorWithMessageAndListWithOneElement() {20 try {21 new MultipleFailureException(MESSAGE, LIST_WITH_ONE_ELEMENT);22 fail();23 } catch (IllegalArgumentException e) {24 }25 }26 public void testConstructorWithMessageAndListWithTwoElements() {27 MultipleFailureException e = new MultipleFailureException(MESSAGE, LIST_WITH_TWO_ELEMENTS);28 assertEquals(MESSAGE, e.getMessage());29 assertEquals(LIST_WITH_TWO_ELEMENTS, e.getFailures());30 }31 public void testConstructorWithEmptyList() {32 try {33 new MultipleFailureException(EMPTY_LIST);34 fail();35 } catch (IllegalArgumentException e) {36 }37 }38 public void testConstructorWithListWithOneElement() {39 try {40 new MultipleFailureException(LIST_WITH_ONE_ELEMENT);41 fail();42 } catch (IllegalArgumentException e) {43 }44 }45 public void testConstructorWithListWithTwoElements() {46 MultipleFailureException e = new MultipleFailureException(LIST_WITH_TWO_ELEMENTS);47 assertEquals(LIST_WITH_TWO_ELEMENTS, e.getFailures());48 }49 public void testGetFailures() {50 MultipleFailureException e = new MultipleFailureException(MESSAGE, LIST_WITH_TWO_ELEMENTS);51 assertEquals(LIST_WITH_TWO_ELEMENTS, e.getFailures());52 }53 public void testGetMessage() {

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1int freePort = findFreePort();23chromeOptions.addArguments("--remote-debugging-port=" + freePort);45ChromeDriver driver = new ChromeDriver(chromeOptions);`6
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1var xhr = new XMLHttpRequest();2xhr.open('GET', 'http:/​/​exampleurl.ex', false);3xhr.send(null);45assert(200, xhr.status);6
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1public static boolean linkExists(String URLName){2 try {3 HttpURLConnection.setFollowRedirects(false);4 HttpURLConnection con = (HttpURLConnection) new URL(URLName).openConnection();5 con.setRequestMethod("HEAD");6 return (con.getResponseCode() == HttpURLConnection.HTTP_OK);7 }8 catch (Exception e) {9 e.printStackTrace();10 return false;11 }12}13
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Questions
Discussion

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.

https://stackoverflow.com/questions/16723715/junit-4-expected-exception-type

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