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

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

Source:ThrowableAssertAlternative.java

...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;})...

withRootCauseInstanceOf

Using AI Code Generation

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);

withRootCauseInstanceOf

Using AI Code Generation

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}

withRootCauseInstanceOf

Using AI Code Generation

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 {

withRootCauseInstanceOf

Using AI Code Generation

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"))

withRootCauseInstanceOf

Using AI Code Generation

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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