How to use assertHasRootCauseInstanceOf method of org.assertj.core.internal.Throwables class

Best Assertj code snippet using org.assertj.core.internal.Throwables.assertHasRootCauseInstanceOf

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...21import org.junit.jupiter.api.Test;22import org.mockito.Mockito;23/​**24 * Tests for25 * {@link org.assertj.core.internal.Throwables#assertHasRootCauseInstanceOf(org.assertj.core.api.AssertionInfo, Throwable, Class)}26 * .27 *28 * @author Jean-Christophe Gay29 */​30public class Throwables_assertHasRootCauseInstanceOf_Test extends ThrowablesBaseTest {31 private Throwable throwableWithCause = new Throwable(new Exception(new IllegalArgumentException()));32 @Test33 public void should_pass_if_root_cause_is_exactly_instance_of_expected_type() {34 throwables.assertHasRootCauseInstanceOf(TestData.someInfo(), throwableWithCause, IllegalArgumentException.class);35 }36 @Test37 public void should_pass_if_root_cause_is_instance_of_expected_type() {38 throwables.assertHasRootCauseInstanceOf(TestData.someInfo(), throwableWithCause, RuntimeException.class);39 }40 @Test41 public void should_fail_if_actual_is_null() {42 Assertions.assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> throwables.assertHasRootCauseInstanceOf(someInfo(), null, .class)).withMessage(FailureMessages.actualIsNull());43 }44 @Test45 public void should_throw_NullPointerException_if_given_type_is_null() {46 Assertions.assertThatNullPointerException().isThrownBy(() -> throwables.assertHasRootCauseInstanceOf(someInfo(), throwableWithCause, null)).withMessage("The given type should not be null");47 }48 @Test49 public void should_fail_if_actual_has_no_cause() {50 AssertionInfo info = TestData.someInfo();51 Class<NullPointerException> expectedCauseType = NullPointerException.class;52 try {53 throwables.assertHasRootCauseInstanceOf(info, ThrowablesBaseTest.actual, expectedCauseType);54 } catch (AssertionError err) {55 Mockito.verify(failures).failure(info, ShouldHaveRootCauseInstance.shouldHaveRootCauseInstance(ThrowablesBaseTest.actual, expectedCauseType));56 return;57 }58 TestFailures.failBecauseExpectedAssertionErrorWasNotThrown();59 }60 @Test61 public void should_fail_if_root_cause_is_not_instance_of_expected_type() {62 AssertionInfo info = TestData.someInfo();63 Class<NullPointerException> expectedCauseType = NullPointerException.class;64 try {65 throwables.assertHasRootCauseInstanceOf(info, throwableWithCause, expectedCauseType);66 } catch (AssertionError err) {67 Mockito.verify(failures).failure(info, ShouldHaveRootCauseInstance.shouldHaveRootCauseInstance(throwableWithCause, expectedCauseType));68 return;69 }70 TestFailures.failBecauseExpectedAssertionErrorWasNotThrown();71 }72}...

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1import org.assertj.core.api.Assertions;2import org.assertj.core.internal.Throwables;3import org.junit.Test;4import java.io.IOException;5public class AssertHasRootCauseInstanceOfTest {6 public void testAssertHasRootCauseInstanceOf() {7 try {8 throw new RuntimeException(new IOException());9 } catch (Exception e) {10 Assertions.assertThat(e).hasRootCauseInstanceOf(IOException.class);11 }12 }13}14 at org.junit.Assert.assertEquals(Assert.java:115)15 at org.junit.Assert.assertEquals(Assert.java:144)16 at org.assertj.core.api.AbstractThrowableAssert.hasRootCauseInstanceOf(AbstractThrowableAssert.java:432)17 at org.assertj.core.api.AbstractThrowableAssert.hasRootCauseInstanceOf(AbstractThrowableAssert.java:42)18 at AssertHasRootCauseInstanceOfTest.testAssertHasRootCauseInstanceOf(AssertHasRootCauseInstanceOfTest.java:21)19 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)20 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)21 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)22 at java.lang.reflect.Method.invoke(Method.java:498)23 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)24 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)25 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)26 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)27 at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)28 at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)29 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)30 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)31 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)32 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)33 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)34 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)35 at org.junit.runners.ParentRunner.access$000(P

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assertHasRootCauseInstanceOf

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1package org.assertj.core.internal;2import org.assertj.core.api.ThrowableAssert.ThrowingCallable;3import org.assertj.core.api.ThrowableAssert;4import org.assertj.core.api.Assertions;5import org.junit.Test;6public class Throwables_assertHasRootCauseInstanceOf_Test {7public void should_pass_if_root_cause_is_instance_of_expected_type() {8ThrowingCallable throwingCallable = new ThrowingCallable() {9public void call() throws Throwable {10throw new Exception(new IllegalArgumentException());11}12};13Assertions.assertThatThrownBy(throwingCallable)14.hasRootCauseInstanceOf(IllegalArgumentException.class);15}16}17package org.assertj.core.api;18import org.assertj.core.api.ThrowableAssert.ThrowingCallable;19import org.assertj.core.internal.Throwables;20import org.assertj.core.util.CheckReturnValue;21import org.assertj.core.util.VisibleForTesting;22public class ThrowableAssert extends AbstractThrowableAssert<ThrowableAssert, Throwable> {23public ThrowableAssert(Throwable actual) {24super(actual, ThrowableAssert.class);25}26protected Throwables getThrowables(Throwables throwables) {27return throwables;28}29public ThrowableAssert hasRootCauseInstanceOf(Class<? extends Throwable> expected) {30getThrowables().assertHasRootCauseInstanceOf(info, actual, expected);31return myself;32}33}34AssertJ is a Java library that provides a rich set of assertions (or “matchers”) to make testing easier. It’s a library that’s used a lot in the Java community, and it

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1import org.assertj.core.api.Assertions;2import org.assertj.core.api.ThrowableAssert.ThrowingCallable;3import org.junit.Test;4public class AssertHasRootCauseInstanceOfTest {5 public void whenRootCauseIsInstanceOfExpectedType_ThenAssertionPasses() {6 ThrowingCallable shouldRaiseException = () -> {7 try {8 throw new Exception("Root cause", new Exception("Cause"));9 } catch (Exception e) {10 throw new Exception("Outer", e);11 }12 };13 Assertions.assertThatExceptionOfType(Exception.class)14 .isThrownBy(shouldRaiseException)15 .withRootCauseInstanceOf(Exception.class);16 }17}18at org.assertj.core.api.ThrowableAssert.hasRootCauseInstanceOf(ThrowableAssert.java:186)19at org.assertj.core.api.ThrowableAssert.hasRootCauseInstanceOf(ThrowableAssert.java:39)20at org.assertj.core.api.AssertionsForClassTypes.hasRootCauseInstanceOf(AssertionsForClassTypes.java:1022)21at org.assertj.core.api.Assertions.hasRootCauseInstanceOf(Assertions.java:1006)22at com.baeldung.assertj.asserthasrootcauseinstanceof.AssertHasRootCauseInstanceOfTest.whenRootCauseIsInstanceOfExpectedType_ThenAssertionPasses(AssertHasRootCauseInstanceOfTest.java:25)

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1public class Throwables_assertHasRootCauseInstanceOf_Test {2 private Throwables throwables = Throwables.instance();3 private Throwable throwable = new Throwable(new Exception());4 public void should_pass_if_actual_has_root_cause_instance_of_expected_type() {5 throwables.assertHasRootCauseInstanceOf(info, throwable, Exception.class);6 }7 public void should_fail_if_actual_is_null() {8 assertThatNullPointerException().isThrownBy(() -> throwables.assertHasRootCauseInstanceOf(info, null, Exception.class))9 .withMessage(actualIsNull());10 }11 public void should_fail_if_actual_has_no_root_cause() {12 assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> throwables.assertHasRootCauseInstanceOf(info, new Throwable(), Exception.class))13 .withMessage(shouldHaveRootCauseInstanceOf(throwable, Exception.class).create());14 }15 public void should_fail_if_actual_has_root_cause_different_type_than_expected_type() {16 assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> throwables.assertHasRootCauseInstanceOf(info, throwable, RuntimeException.class))17 .withMessage(shouldHaveRootCauseInstanceOf(throwable, RuntimeException.class).create());18 }19 public void should_fail_if_actual_has_root_cause_same_type_as_expected_type_but_different_instance() {20 Throwable throwable = new Throwable(new Exception("boom"));21 assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> throwables.assertHasRootCauseInstanceOf(info, throwable, Exception.class))22 .withMessage(shouldHaveRootCauseInstanceOf(throwable, Exception.class).create());23 }24 private static void throwException() {25 throw new Throwable(new Exception());26 }27}28public class Throwables_assertHasRootCauseMessage_Test {29 private Throwables throwables = Throwables.instance();30 private Throwable throwable = new Throwable(new Exception("boom"));31 public void should_pass_if_actual_has_root_cause_message_equal_to_expected_message() {

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