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How to use rootCause method of org.assertj.core.api.AbstractThrowableAssert class

Best Assertj code snippet using org.assertj.core.api.AbstractThrowableAssert.rootCause

Source:AbstractThrowableAssert.java

...193  /**194   * Returns a new assertion object that uses the root cause of the current Throwable as the actual Throwable under test.195   * <p>196   * Examples:197   * <pre><code class='java'> Throwable rootCause =  new JdbcException("invalid query");198   * Throwable cause =  new RuntimeException(rootCause);199   * Throwable exception = new Exception("boom!", cause);200   *201   * // typical use:202   * assertThat(throwableWithMessage).rootCause()203   *                                 .hasMessageStartingWith("invalid");</code></pre>204   *205   * @return a new assertion object206   * @throws AssertionError if the actual {@code Throwable} is {@code null}.207   * @throws AssertionError if the actual {@code Throwable} does not have a root cause.208   *209   * @since 3.23.0210   */211  public AbstractThrowableAssert<?, ?> rootCause() {212    throwables.assertHasRootCause(info, actual);213    return new ThrowableAssert<>(org.assertj.core.util.Throwables.getRootCause(actual)).withAssertionState(myself);214  }215  /**216   * @deprecated use {@link #rootCause()} instead.217   * <p>218   * Returns a new assertion object that uses the root cause of the current Throwable as the actual Throwable under test.219   * <p>220   * Examples:221   * <pre><code class='java'> Throwable rootCause =  new JdbcException("invalid query");222   * Throwable cause =  new RuntimeException(rootCause);223   * Throwable exception = new Exception("boom!", cause);224   *225   * // typical use:226   * assertThat(throwableWithMessage).getRootCause()227   *                                 .hasMessageStartingWith("invalid");</code></pre>228   *229   * @return a new assertion object230   * @throws AssertionError if the actual {@code Throwable} is {@code null}.231   * @throws AssertionError if the actual {@code Throwable} does not have a root cause.232   *233   * @since 3.16.0234   */235  @Deprecated236  public AbstractThrowableAssert<?, ?> getRootCause() {...

Source:ThrowableAssertAlternative.java

...651   *652   * @since 3.16.0653   */654  public ThrowableAssertAlternative<?> havingRootCause() {655    AbstractThrowableAssert<?, ?> rootCauseAssert = getDelegate().rootCause();656    return new ThrowableAssertAlternative<>(rootCauseAssert.actual);657  }658}...

rootCause

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.junit.Test;3public class RootCauseTest {4    public void testRootCause() {5        try {6            throw new RuntimeException(new RuntimeException());7        } catch (RuntimeException e) {8            Assertions.assertThat(e).hasRootCauseInstanceOf(RuntimeException.class);9        }10    }11}

rootCause

Using AI Code Generation

1package org.example;2import org.assertj.core.api.AbstractThrowableAssert;3import org.junit.Test;4import static org.assertj.core.api.Assertions.assertThat;5{6    public void test1() {7        try {8            throw new Exception("hello");9        } catch (Exception e) {10            AbstractThrowableAssert<?, ? extends Throwable> a = assertThat(e);11            a.rootCause().hasMessage("hello");12        }13    }14}15[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ maven ---16[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ maven ---17[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ maven ---18[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ maven ---19[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ maven ---

rootCause

Using AI Code Generation

1import org.assertj.core.api.AbstractThrowableAssert;2import org.assertj.core.api.Assertions;3public class Test {4    public static void main(String[] args) {5        Throwable throwable = new Throwable(new Exception(new RuntimeException()));6        AbstractThrowableAssert<?, ? extends Throwable> abstractThrowableAssert = Assertions.assertThat(throwable);7        abstractThrowableAssert.rootCause();8    }9}10	at org.assertj.core.api.AbstractThrowableAssert.rootCause(AbstractThrowableAssert.java:242)11	at Test.main(Test.java:9)12import org.assertj.core.api.AbstractThrowableAssert;13import org.assertj.core.api.Assertions;14public class Test {15    public static void main(String[] args) {16        Throwable throwable = new Throwable(new Exception(new RuntimeException()));17        AbstractThrowableAssert<?, ? extends Throwable> abstractThrowableAssert = Assertions.assertThat(throwable);18        abstractThrowableAssert.rootCauseInstanceOf(RuntimeException.class);19    }20}21	at org.assertj.core.api.AbstractThrowableAssert.rootCauseInstanceOf(AbstractThrowableAssert.java:250)22	at Test.main(Test.java:9)23import org.assertj.core.api.AbstractThrowableAssert;24import org.assertj.core.api.Assertions;25public class Test {26    public static void main(String[] args) {27        Throwable throwable = new Throwable(new Exception(new RuntimeException("RuntimeException message")));28        AbstractThrowableAssert<?, ? extends Throwable> abstractThrowableAssert = Assertions.assertThat(throwable);29        abstractThrowableAssert.rootCauseMessage("RuntimeException message");30    }31}

rootCause

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.junit.Test;3public class RootCauseTest {4	public void testRootCause() {5		try {6			throw new RuntimeException("Root cause", new RuntimeException("Cause"));7		} catch (Exception e) {8			Assertions.assertThat(e).hasRootCauseInstanceOf(RuntimeException.class);9		}10	}11}12	at com.javacodegeeks.RootCauseTest.testRootCause(RootCauseTest.java:15)13	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)14	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)15	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)16	at java.lang.reflect.Method.invoke(Method.java:498)17	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)18	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)19	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)20	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)21	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)22	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)23	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)24	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)25	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)26	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)27	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)28	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)29	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)30	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)31	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)32	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

rootCause

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.junit.Test;3import java.io.IOException;4public class 1 {5    public void test1() {6        try {7            throw new IOException("IOException occured");8        } catch (IOException e) {9            Assertions.assertThat(e).hasMessage("IOException occured").rootCause().hasMessage("IOException occured");10        }11    }12}13assertThatThrownBy() method14import org.assertj.core.api.Assertions;15import org.junit.Test;16import java.io.IOException;17public class 1 {18    public void test1() {19        Assertions.assertThatThrownBy(() -> {20            throw new IOException("IOException occured");21        }).hasMessage("IOException occured");22    }23}24assertThatCode() method25import org.assertj.core.api.Assertions;26import org.junit.Test;27import java.io.IOException;28public class 1 {29    public void test1() {30        Assertions.assertThatCode(() -> {31            System.out.println("No exception thrown");32        }).doesNotThrowAnyException();33    }34}

rootCause

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.junit.Test;3import java.io.IOException;4import java.io.FileNotFoundException;5import java.io.FileInputStream;6public class RootCause {7    public void test() throws IOException {8        try {9            FileInputStream fis = new FileInputStream("file.txt");10        } catch (FileNotFoundException e) {11            Assertions.assertThat(e).hasRootCauseInstanceOf(IOException.class);12        }13    }14}15org.assertj.core.api.ThrowableAssertAlternative has no method hasRootCauseInstanceOf(java.lang.Class<java.io.IOException>)

rootCause

Using AI Code Generation

1import org.assertj.core.api.Assertions;2import org.assertj.core.api.ThrowableAssert;3class Test {4    public static void main(String[] args) {5        ThrowableAssert.throwable(new RuntimeException("root cause", new RuntimeException("cause"))).rootCause().hasMessage("root cause");6    }7}

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