How to use handleAssertionErrors method of org.junit.rules.ExpectedException class

Best junit code snippet using org.junit.rules.ExpectedException.handleAssertionErrors

ExpectedExceptionorg.junit.rules.ExpectedException

The ExpectedException is a rule which helps scripts to verify that the script throws the specific exception or not

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...13 * @author Lovro Pandzic14 */​15public class BddIntegrationTest {16 @Rule17 public ExpectedException expectedException = ExpectedException.none().handleAssertionErrors();18 private ClassUnderTest classUnderTest = new ClassUnderTest();19 @Test20 public void shouldPassWhenExpectedExceptionIsThrown() throws Exception {21 when(() -> classUnderTest.throwsA(new Exception())).thenChecked(e -> assertThat(e, isA(Exception.class)));22 }23 @Test24 public void shouldFailWhenWrongExceptionIsThrown() throws Exception {25 expectedException.handleAssertionErrors();26 expectedException.expect(AssertionError.class);27 when(() -> classUnderTest.throwsA(new IOException())).then(e -> assertThat(e,28 is(instanceOf(NullPointerException29 .class))));30 }31 @Test32 public void shouldPassWhenReturnsExpectedObject() {33 Object value = new Object();34 when(classUnderTest.returnsA(value)).then(actual -> assertThat(actual, is(equalTo(value))));35 }36 @Test37 public void simpleLambdaThrowTest() throws Exception {38 when(() -> {39 throw new Exception();40 }).thenChecked(e -> assertThat(e, isA(Exception.class)));41 }42 @Test43 public void simpleLambdaReturnTest() {44 when(new Object()).then(actual -> assertThat(actual, isA(Object.class)));45 }46 @Test(expected = Exception.class)47 public void shouldFailWhenValueProviderThrowsAUncheckedException() throws Exception {48 when(classUnderTest.throwsA(new Exception()));49 }50 @Test51 public void shouldFailWhenExceptionProviderThrowsAUncheckedException() throws Exception {52 expectedException.expect(isA(Exception.class));53 when(() -> classUnderTest.throwsA(new Exception())).thenShouldNotThrow();54 }55 @Test56 public void shouldFailWhenReturnsOneObjectButExpectsDifferentObject() {57 expectedException.handleAssertionErrors();58 expectedException.expect(AssertionError.class);59 expectedException.expectMessage("is <java.lang.Object");60 expectedException.expectMessage("but: was");61 Object value = new Object();62 when(classUnderTest.returnsA(value)).then(actual -> assertThat(actual, is(equalTo(new Object()))));63 }64 @Test65 public void shouldFailOnFirstWhenWhenTwoWhensFail() {66 expectedException.expect(isA(IOException.class));67 when(() -> classUnderTest.throwsA(new IOException()));68 when(() -> classUnderTest.throwsA(new Exception()));69 }70 @Test71 public void shouldFailWithUnexpectedExceptionForWrongCheckedException() {...

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...15import org.junit.runners.model.Statement;16public class ExpectedException17implements TestRule {18 private final ExpectedExceptionMatcherBuilder fMatcherBuilder = new ExpectedExceptionMatcherBuilder();19 private boolean handleAssertionErrors = false;20 private boolean handleAssumptionViolatedExceptions = false;21 private ExpectedException() {22 }23 private void failDueToMissingException() throws AssertionError {24 String string2 = StringDescription.toString(this.fMatcherBuilder.build());25 Assert.fail("Expected test to throw " + string2);26 }27 private void handleException(Throwable throwable) throws Throwable {28 if (this.fMatcherBuilder.expectsThrowable()) {29 Assert.assertThat(throwable, this.fMatcherBuilder.build());30 return;31 }32 throw throwable;33 }34 public static ExpectedException none() {35 return new ExpectedException();36 }37 private void optionallyHandleException(Throwable throwable, boolean bl2) throws Throwable {38 if (bl2) {39 this.handleException(throwable);40 return;41 }42 throw throwable;43 }44 @Override45 public Statement apply(Statement statement, Description description) {46 return new ExpectedExceptionStatement(statement);47 }48 public void expect(Class<? extends Throwable> class_) {49 this.expect(CoreMatchers.instanceOf(class_));50 }51 public void expect(Matcher<?> matcher) {52 this.fMatcherBuilder.add(matcher);53 }54 public void expectCause(Matcher<? extends Throwable> matcher) {55 this.expect(ThrowableCauseMatcher.hasCause(matcher));56 }57 public void expectMessage(String string2) {58 this.expectMessage(CoreMatchers.containsString(string2));59 }60 public void expectMessage(Matcher<String> matcher) {61 this.expect(ThrowableMessageMatcher.hasMessage(matcher));62 }63 public ExpectedException handleAssertionErrors() {64 this.handleAssertionErrors = true;65 return this;66 }67 public ExpectedException handleAssumptionViolatedExceptions() {68 this.handleAssumptionViolatedExceptions = true;69 return this;70 }71 private class ExpectedExceptionStatement72 extends Statement {73 private final Statement fNext;74 public ExpectedExceptionStatement(Statement statement) {75 this.fNext = statement;76 }77 @Override78 public void evaluate() throws Throwable {79 try {80 this.fNext.evaluate();81 if (ExpectedException.this.fMatcherBuilder.expectsThrowable()) {82 ExpectedException.this.failDueToMissingException();83 }84 return;85 }86 catch (AssumptionViolatedException var1_1) {87 ExpectedException.this.optionallyHandleException(var1_1, ExpectedException.this.handleAssumptionViolatedExceptions);88 return;89 }90 catch (AssertionError var1_2) {91 ExpectedException.this.optionallyHandleException((Throwable)((Object)var1_2), ExpectedException.this.handleAssertionErrors);92 return;93 }94 catch (Throwable var1_3) {95 ExpectedException.this.handleException(var1_3);96 return;97 }98 }99 }100}...

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...18public class ThreeTenBaseTest {19 @Rule20 public ExpectedException thrown = none();21 protected void expectException(Class<? extends Throwable> type, String message) {22 thrown.handleAssertionErrors();23 thrown.expect(type);24 thrown.expectMessage(message);25 }26 27 protected void expectIllegalArgumentException(String message) {28 expectException(IllegalArgumentException.class, message);29 }30 public void failBecauseExpectedAssertionErrorWasNotThrown() {31 Assert.fail("Assertion error expected");32 }33}...

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handleAssertionErrors

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1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ExpectedException;4import static org.junit.Assert.assertEquals;5import static org.junit.Assert.fail;6public class TestJUnit4 {7 public ExpectedException thrown = ExpectedException.none();8 public void throwsNothing() {9 }10 public void throwsNullPointerException() {11 thrown.expect(NullPointerException.class);12 throw new NullPointerException();13 }14 public void throwsNullPointerExceptionWithMessage() {15 thrown.expect(NullPointerException.class);16 thrown.expectMessage("happened");17 thrown.reportMissingExceptionWithMessage("Expected NullPointerException to be thrown with message a string containing \"happened\"");18 throw new NullPointerException("something happened");19 }20 public void test() {21 try {22 throw new NullPointerException();23 } catch (NullPointerException e) {24 assertEquals("NullPointerException", e.getClass().getSimpleName());25 }26 }27 public void test2() {28 try {29 throw new NullPointerException();30 } catch (NullPointerException e) {31 assertEquals("NullPointerException", e.getClass().getSimpleName());32 return;33 }34 fail("Should have thrown an exception");35 }36}37The test() method is almost the same as the test2() method. The difference is that in the test() method, the catch

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handleAssertionErrors

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1import org.junit.Test;2import org.junit.Rule;3import org.junit.rules.ExpectedException;4public class TestException {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 throwsIllegalArgumentException() {13 thrown.expect(IllegalArgumentException.class);14 throw new IllegalArgumentException();15 }16 public void throwsNullPointerExceptionWithMessage() {17 thrown.expect(NullPointerException.class);18 thrown.expectMessage("Hello");19 throw new NullPointerException("Hello");20 }21 public void throwsNullPointerExceptionWithMessageContaining() {22 thrown.expect(NullPointerException.class);23 thrown.expectMessage("Hello");24 throw new NullPointerException("Hello World");25 }26 public void throwsNullPointerExceptionWithMessageMatching() {27 thrown.expect(NullPointerException.class);28 thrown.expectMessage(".*H.llo.*");29 throw new NullPointerException("Hello World");30 }31 public void throwsNullPointerExceptionWithCause() {32 NullPointerException cause = new NullPointerException("Hello");33 thrown.expect(IllegalArgumentException.class);34 thrown.expectCause(is(cause));35 throw new IllegalArgumentException(cause);36 }37 public void throwsNullPointerExceptionWithCauseContaining() {38 NullPointerException cause = new NullPointerException("Hello");39 thrown.expect(IllegalArgumentException.class);40 thrown.expectCause(is(cause));41 throw new IllegalArgumentException(new NullPointerException("Hello World"));42 }43 public void throwsNullPointerExceptionWithCauseMatching() {44 NullPointerException cause = new NullPointerException("Hello");45 thrown.expect(IllegalArgumentException.class);46 thrown.expectCause(is(cause));47 throw new IllegalArgumentException(new NullPointerException("Hello World"));48 }49}

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handleAssertionErrors

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1import static org.junit.Assert.assertEquals;2import static org.junit.Assert.assertTrue;3import org.junit.Rule;4import org.junit.Test;5import org.junit.rules.ExpectedException;6public class ExpectedExceptionTest {7 public ExpectedException thrown = ExpectedException.none();8 public void throwsNothing() {9 }10 public void throwsNullPointerException() {11 thrown.expect(NullPointerException.class);12 throw new NullPointerException();13 }14 public void throwsNullPointerExceptionWithMessage() {15 thrown.expect(NullPointerException.class);16 thrown.expectMessage("happened");17 throw new NullPointerException("something happened");18 }19 public void throwsArithmeticExceptionWithMessage() {20 thrown.expect(ArithmeticException.class);21 thrown.expectMessage("/​ by zero");22 int i = 1 /​ 0;23 }24 public void throwsArithmeticExceptionWithMessage2() {25 thrown.expect(ArithmeticException.class);26 thrown.expectMessage("/​ by zero");27 thrown.expectMessage("second message");28 int i = 1 /​ 0;29 }30 public void throwsArithmeticExceptionWithMessage3() {31 thrown.expect(ArithmeticException.class);32 thrown.expectMessage("/​ by zero");33 thrown.expectMessage("second message");34 int i = 1 /​ 0;35 }36 public void throwsArithmeticExceptionWithMessage4() {37 thrown.expect(ArithmeticException.class);38 thrown.expectMessage("/​ by zero");39 thrown.expectMessage("second message");40 int i = 1 /​ 0;41 }42 public void throwsArithmeticExceptionWithMessage5() {43 thrown.expect(ArithmeticException.class);44 thrown.expectMessage("/​ by zero");45 thrown.expectMessage("second message");46 int i = 1 /​ 0;47 }48 public void throwsArithmeticExceptionWithMessage6() {49 thrown.expect(ArithmeticException.class);50 thrown.expectMessage("/​ by zero");51 thrown.expectMessage("second message");52 int i = 1 /​ 0;53 }54 public void throwsArithmeticExceptionWithMessage7() {55 thrown.expect(ArithmeticException.class);56 thrown.expectMessage("/​ by zero");57 thrown.expectMessage("second message");

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handleAssertionErrors

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1[INFO] [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project junit4: Compilation failure: Compilation failure:2[INFO] [ERROR] symbol: method handleAssertionErrors()3[INFO] [ERROR] symbol: method handleAssertionErrors()4[INFO] [ERROR] symbol: method handleAssertionErrors()5[INFO] [ERROR] symbol: method handleAssertionErrors()6[INFO] [ERROR] symbol: method handleAssertionErrors()7[INFO] [ERROR] symbol: method handleAssertionErrors()

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handleAssertionErrors

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1import org.junit.Test;2import org.junit.rules.ExpectedException;3import static org.junit.Assert.assertEquals;4import static org.junit.Assert.fail;5public class ExceptionTest {6 public void testExceptionMessage() {7 try {8 throw new IllegalArgumentException("a message");9 } catch (IllegalArgumentException e) {10 assertEquals("a message", e.getMessage());11 }12 }13 public void testExceptionMessageWithRule() {14 ExpectedException thrown = ExpectedException.none();15 thrown.expect(IllegalArgumentException.class);16 thrown.expectMessage("a message");17 throw new IllegalArgumentException("a message");18 }19}20at org.junit.Assert.assertEquals(Assert.java:115)21at org.junit.Assert.assertEquals(Assert.java:144)22at com.baeldung.junit.exception.ExceptionTest.testExceptionMessage(ExceptionTest.java:11)23at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)24at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)25at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)26at java.lang.reflect.Method.invoke(Method.java:498)27at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)28at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)29at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)30at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)31at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)32at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)33at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)34at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)35at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)36at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)37at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)38at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)39at org.junit.runners.ParentRunner.run(ParentRunner.java:363)40at org.junit.runner.JUnitCore.run(JUnitCore.java:137)

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handleAssertionErrors

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1 public ExpectedException thrown = ExpectedException.none();2 public void testException() {3 thrown.expect(IllegalArgumentException.class);4 thrown.expectMessage("Negative value not allowed");5 MathUtils.divide(1, -1);6 }7 @Test(expected = IllegalArgumentException.class)8 public void testException2() {9 MathUtils.divide(1, -1);10 }11 public void testException3() {12 try {13 MathUtils.divide(1, -1);14 fail("Expected an IllegalArgumentException to be thrown");15 } catch (IllegalArgumentException anException) {16 assertThat(anException.getMessage(), is("Negative value not allowed"));17 }18 }19 public void testException4() {20 try {21 MathUtils.divide(1, 0);22 fail("Expected an ArithmeticException to be thrown");23 } catch (ArithmeticException anException) {24 assertThat(anException.getMessage(), is("Division by zero"));25 }26 }27}

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Debugging Spring configuration

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You need to have prepared the class calling the constructor, not the class on which the constructor is called, the following should fix you up:

@PrepareForTest(DummyTarget.class)

For more information check this page.

https://stackoverflow.com/questions/13481702/powermock-mocking-constructor-via-whennew-does-not-work-with-anonymous-class

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