How to use withRootCauseInstanceOf method of org.assertj.core.api.ThrowableAssertAlternative class

Best Assertj code snippet using org.assertj.core.api.ThrowableAssertAlternative.withRootCauseInstanceOf

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...350 *351 * /​/​ assertion will pass352 * assertThatExceptionOfType(Throwable.class)353 * .isThrownBy(() -&gt; {throw throwable;})354 * .withRootCauseInstanceOf(NullPointerException.class);355 * assertThatExceptionOfType(Throwable.class)356 * .isThrownBy(() -&gt; {throw throwable;})357 * .withRootCauseInstanceOf(RuntimeException.class);358 *359 * /​/​ assertion will fail360 * assertThatExceptionOfType(Throwable.class)361 * .isThrownBy(() -&gt; {throw throwable;})362 * .withRootCauseInstanceOf(IllegalStateException.class);</​code></​pre>363 *364 * @param type the expected cause type.365 * @return this assertion object.366 * @throws NullPointerException if given type is {@code null}.367 * @throws AssertionError if the actual {@code Throwable} is {@code null}.368 * @throws AssertionError if the actual {@code Throwable} has no cause.369 * @throws AssertionError if the cause of the actual {@code Throwable} is not an instance of the given type.370 * @see AbstractThrowableAssert#hasRootCauseInstanceOf(Class)371 */​372 public ThrowableAssertAlternative<T> withRootCauseInstanceOf(Class<? extends Throwable> type) {373 delegate.hasRootCauseInstanceOf(type);374 return this;375 }376 /​**377 * Verifies that the root cause of the actual {@code Throwable} is <b>exactly</​b> an instance of the given type.378 * <p>379 * Example:380 * <pre><code class='java'> Throwable throwable = new Throwable(381 * new IllegalStateException(382 * new NullPointerException()));383 *384 * /​/​ assertion will pass385 * assertThatExceptionOfType(Throwable.class)386 * .isThrownBy(() -&gt; {throw throwable;})...

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withRootCauseInstanceOf

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1org.assertj.core.api.Assertions.assertThatThrownBy(() -> {2 throw new Exception("boom!");3}).withRootCauseInstanceOf(IOException.class);4org.assertj.core.api.Assertions.assertThatThrownBy(() -> {5 throw new Exception("boom!");6}).withRootCauseInstanceOf(IOException.class);7org.assertj.core.api.Assertions.assertThatThrownBy(() -> {8 throw new Exception("boom!");9}).withRootCauseInstanceOf(IOException.class);10org.assertj.core.api.Assertions.assertThatThrownBy(() -> {11 throw new Exception("boom!");12}).withRootCauseInstanceOf(IOException.class);13org.assertj.core.api.Assertions.assertThatThrownBy(() -> {14 throw new Exception("boom!");15}).withRootCauseInstanceOf(IOException.class);16org.assertj.core.api.Assertions.assertThatThrownBy(() -> {17 throw new Exception("boom!");18}).withRootCauseInstanceOf(IOException.class);19org.assertj.core.api.Assertions.assertThatThrownBy(() -> {20 throw new Exception("boom!");21}).withRootCauseInstanceOf(IOException.class);22org.assertj.core.api.Assertions.assertThatThrownBy(() -> {23 throw new Exception("boom!");24}).withRootCauseInstanceOf(IOException.class);25org.assertj.core.api.Assertions.assertThatThrownBy(() -> {26 throw new Exception("boom!");27}).withRootCauseInstanceOf(IOException.class);28org.assertj.core.api.Assertions.assertThatThrownBy(() -> {29 throw new Exception("boom!");30}).withRootCauseInstanceOf(IOException.class);31org.assertj.core.api.Assertions.assertThatThrownBy(() -> {32 throw new Exception("boom!");33}).withRootCauseInstanceOf(IOException.class);

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withRootCauseInstanceOf

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1import java.io.IOException;2import java.util.Arrays;3import java.util.List;4import org.assertj.core.api.ThrowableAssertAlternative;5import org.junit.Test;6public class AssertJRootCauseInstanceOfTest {7 public void test() {8 try {9 throw new RuntimeException(new IOException("Root cause"));10 } catch (RuntimeException e) {11 ThrowableAssertAlternative<?> assertion = assertThat(e);12 assertion.hasRootCauseInstanceOf(IOException.class);13 assertion.hasRootCauseMessage("Root cause");14 }15 }16 public void test2() {17 try {18 throw new RuntimeException(new IOException("Root cause"));19 } catch (RuntimeException e) {20 ThrowableAssertAlternative<?> assertion = assertThat(e);21 assertion.hasRootCauseInstanceOf(IOException.class);22 assertion.hasRootCauseMessage("Root cause");23 }24 }25 public void test3() {26 try {27 throw new RuntimeException(new IOException("Root cause"));28 } catch (RuntimeException e) {29 ThrowableAssertAlternative<?> assertion = assertThat(e);30 assertion.hasRootCauseInstanceOf(IOException.class);31 assertion.hasRootCauseMessage("Root cause");32 }33 }34 public void test4() {35 try {36 throw new RuntimeException(new IOException("Root cause"));37 } catch (RuntimeException e) {38 ThrowableAssertAlternative<?> assertion = assertThat(e);39 assertion.hasRootCauseInstanceOf(IOException.class);40 assertion.hasRootCauseMessage("Root cause");41 }42 }43}

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withRootCauseInstanceOf

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1package com.example;2import org.junit.jupiter.api.Test;3import static org.assertj.core.api.Assertions.assertThat;4import static org.assertj.core.api.Assertions.assertThatExceptionOfType;5class AssertJTest {6 void shouldUseWithRootCauseInstanceOf() {7 Exception rootCause = new Exception("root cause");8 Exception exception = new Exception("exception", rootCause);9 assertThatExceptionOfType(Exception.class)10 .isThrownBy(() -> {11 throw exception;12 })13 .withRootCauseInstanceOf(Exception.class)14 .withRootCauseMessage("root cause");15 }16}17package com.example;18import org.junit.jupiter.api.Test;19import static org.assertj.core.api.Assertions.assertThat;20import static org.assertj.core.api.Assertions.assertThatExceptionOfType;21class AssertJTest {22 void shouldUseWithRootCauseInstanceOf() {23 Exception rootCause = new Exception("root cause");24 Exception exception = new Exception("exception", rootCause);25 assertThatExceptionOfType(Exception.class)26 .isThrownBy(() -> {27 throw exception;28 })29 .withRootCauseInstanceOf(Exception.class)30 .withRootCauseMessage("root cause");31 }32}33package com.example;34import org.junit.jupiter.api.Test;35import static org.assertj.core.api.Assertions.assertThat;36import static org.assertj.core.api.Assertions.assertThatExceptionOfType;37class AssertJTest {38 void shouldUseWithRootCauseInstanceOf() {39 Exception rootCause = new Exception("root cause");40 Exception exception = new Exception("exception", rootCause);41 assertThatExceptionOfType(Exception.class)42 .isThrownBy(() -> {43 throw exception;44 })45 .withRootCauseInstanceOf(Exception.class)46 .withRootCauseMessage("root cause");47 }48}49package com.example;50import org.junit.jupiter.api.Test;51import static org.assertj.core.api.Assertions.assertThat;52import static org.assertj.core.api.Assertions.assertThatExceptionOfType;53class AssertJTest {

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withRootCauseInstanceOf

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1import org.assertj.core.api.ThrowableAssertAlternative2import org.assertj.core.api.Assertions.assertThatThrownBy3def "test withRootCauseInstanceOf"() {4 def exception = new Exception("error", new IllegalArgumentException("illegal argument"))5 assertThatThrownBy({throw exception})6 .withRootCauseInstanceOf(IllegalArgumentException)7}8def "test withRootCauseInstanceOf"() {9 def exception = new Exception("error", new IllegalArgumentException("illegal argument"))10 assertThatThrownBy({throw exception})11 .withRootCauseInstanceOf(Exception)12}13def "test withRootCauseInstanceOf"() {14 def exception = new Exception("error", new IllegalArgumentException("illegal argument"))15 assertThatThrownBy({throw exception})16 .withRootCauseInstanceOf(IllegalStateException)17}18def "test withRootCauseInstanceOf"() {19 def exception = new Exception("error", new IllegalArgumentException("illegal argument"))20 assertThatThrownBy({throw exception})21 .withRootCauseInstanceOf(Throwable)22}23def "test withRootCauseInstanceOf"() {24 def exception = new Exception("error", new IllegalArgumentException("illegal argument"))

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1package com.tutorialspoint.test;2import org.junit.Test;3import org.junit.runner.RunWith;4import org.springframework.boot.test.context.SpringBootTest;5import org.springframework.test.context.junit4.SpringRunner;6import static org.assertj.core.api.Assertions.assertThat;7import static org.assertj.core.api.Assertions.assertThatExceptionOfType;8@RunWith(SpringRunner.class)9public class TestApplicationTests {10 public void testExceptionMessage() {11 try {12 throw new Exception("boom!");13 } catch (Exception e) {14 assertThat(e).hasMessage("boom!");15 }16 }17 public void testExceptionMessageWithAlternativeSyntax() {18 assertThatExceptionOfType(Exception.class).isThrownBy(() -> {19 throw new Exception("boom!");20 }).withMessage("boom!");21 }22 public void testExceptionMessageWithAlternativeSyntax2() {23 assertThatExceptionOfType(Exception.class).isThrownBy(() -> {24 throw new Exception("boom!");25 }).withMessageContaining("boom");26 }27 public void testExceptionMessageWithAlternativeSyntax3() {28 assertThatExceptionOfType(Exception.class).isThrownBy(() -> {29 throw new Exception("boom!");30 }).withMessageStartingWith("boom");31 }32 public void testExceptionMessageWithAlternativeSyntax4() {33 assertThatExceptionOfType(Exception.class).isThrownBy(() -> {34 throw new Exception("boom!");35 }).withMessageEndingWith("!");36 }37 public void testExceptionCause() {38 try {39 throw new Exception("boom!", new RuntimeException("oops!"));40 } catch (Exception e) {41 assertThat(e).hasCauseInstanceOf(RuntimeException.class);42 }43 }44 public void testExceptionCauseWithAlternativeSyntax() {45 assertThatExceptionOfType(Exception.class).isThrownBy(() -> {46 throw new Exception("boom!", new RuntimeException("oops!"));47 }).withCauseInstanceOf(RuntimeException.class);48 }49 public void testExceptionCauseWithAlternativeSyntax2() {50 assertThatExceptionOfType(Exception.class).isThrownBy(() -> {51 throw new Exception("boom!", new RuntimeException("oops!"));52 }).withRootCauseInstanceOf(RuntimeException.class);53 }54 public void testExceptionCauseWithAlternativeSyntax3() {55 assertThatExceptionOfType(Exception.class).isThrownBy(() -> {56 throw new Exception("boom!", new RuntimeException("oops!"));

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