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

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

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...316 *317 * /​/​ assertion will pass318 * assertThatExceptionOfType(Throwable.class)319 * .isThrownBy(() -&gt; {throw throwable;})320 * .withCauseExactlyInstanceOf(NullPointerException.class);321 *322 * /​/​ assertions will fail (even if NullPointerException is a RuntimeException since we want an exact match)323 * assertThatExceptionOfType(Throwable.class)324 * .isThrownBy(() -&gt; {throw throwable;})325 * .withCauseExactlyInstanceOf(RuntimeException.class);326 * assertThatExceptionOfType(Throwable.class)327 * .isThrownBy(() -&gt; {throw throwable;})328 * .withCauseExactlyInstanceOf(IllegalArgumentException.class);</​code></​pre>329 *330 * @param type the expected cause type.331 * @return this assertion object.332 * @throws NullPointerException if given type is {@code null}.333 * @throws AssertionError if the actual {@code Throwable} is {@code null}.334 * @throws AssertionError if the actual {@code Throwable} has no cause.335 * @throws AssertionError if the cause of the actual {@code Throwable} is not <b>exactly</​b> an instance of the given336 * type.337 * @see AbstractThrowableAssert#hasCauseExactlyInstanceOf(Class) 338 */​339 public ThrowableAssertAlternative<T> withCauseExactlyInstanceOf(Class<? extends Throwable> type) {340 delegate.hasCauseExactlyInstanceOf(type);341 return this;342 }343 /​**344 * Verifies that the root cause of the actual {@code Throwable} is an instance of the given type.345 * <p>346 * Example:347 * <pre><code class='java'> Throwable throwable = new Throwable(348 * new IllegalStateException(349 * new NullPointerException()));350 *351 * /​/​ assertion will pass352 * assertThatExceptionOfType(Throwable.class)353 * .isThrownBy(() -&gt; {throw throwable;})...

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withCauseExactlyInstanceOf

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1assertThatExceptionOfType(NullPointerException.class)2 .isThrownBy(() -> { throw new NullPointerException("boom!"); })3 .withCauseExactlyInstanceOf(IllegalStateException.class);4assertThatExceptionOfType(NullPointerException.class)5 .isThrownBy(() -> { throw new NullPointerException("boom!"); })6 .withCauseExactlyInstanceOf(IllegalStateException.class)7 .withMessage("boom!");8assertThatExceptionOfType(NullPointerException.class)9 .isThrownBy(() -> { throw new NullPointerException("boom!"); })10 .withCauseExactlyInstanceOf(IllegalStateException.class)11 .withMessage("boom!")12 .withMessageContaining("boom");13assertThatExceptionOfType(NullPointerException.class)14 .isThrownBy(() -> { throw new NullPointerException("boom!"); })15 .withCauseExactlyInstanceOf(IllegalStateException.class)16 .withMessage("boom!")17 .withMessageContaining("boom")18 .withMessageStartingWith("boom");19assertThatExceptionOfType(NullPointerException.class)20 .isThrownBy(() -> { throw new NullPointerException("boom!"); })21 .withCauseExactlyInstanceOf(IllegalStateException.class)22 .withMessage("boom!")23 .withMessageContaining("boom")24 .withMessageStartingWith("boom")25 .withMessageEndingWith("boom");26assertThatExceptionOfType(NullPointerException.class)27 .isThrownBy(() -> { throw new NullPointerException("boom!"); })28 .withCauseExactlyInstanceOf(IllegalStateException.class)29 .withMessage("boom!")30 .withMessageContaining("boom")31 .withMessageStartingWith("boom")32 .withMessageEndingWith("boom")33 .withMessageMatching("boom");34assertThatExceptionOfType(NullPointerException.class)35 .isThrownBy(() -> { throw new NullPointerException("boom!"); })36 .withCauseExactlyInstanceOf(IllegalStateException.class)37 .withMessage("boom!")38 .withMessageContaining("boom")

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withCauseExactlyInstanceOf

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1ThrowableAssertAlternative<Throwable> throwableAssertAlternative = assertThat(throwable);2ThrowableAssertAlternative<Throwable> throwableAssertAlternative2 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);3ThrowableAssertAlternative<Throwable> throwableAssertAlternative3 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);4ThrowableAssertAlternative<Throwable> throwableAssertAlternative4 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);5ThrowableAssertAlternative<Throwable> throwableAssertAlternative5 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);6ThrowableAssertAlternative<Throwable> throwableAssertAlternative6 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);7ThrowableAssertAlternative<Throwable> throwableAssertAlternative7 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);8ThrowableAssertAlternative<Throwable> throwableAssertAlternative8 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);9ThrowableAssertAlternative<Throwable> throwableAssertAlternative9 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);10ThrowableAssertAlternative<Throwable> throwableAssertAlternative10 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);11ThrowableAssertAlternative<Throwable> throwableAssertAlternative11 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);12ThrowableAssertAlternative<Throwable> throwableAssertAlternative12 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class);13ThrowableAssertAlternative<Throwable> throwableAssertAlternative13 = throwableAssertAlternative.withCauseExactlyInstanceOf(RuntimeException.class

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withCauseExactlyInstanceOf

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1import org.assertj.core.api.ThrowableAssertAlternative;2import java.io.IOException;3import static org.assertj.core.api.Assertions.assertThat;4public class AssertJThrowableAssertAlternativeTest {5 public static void main(String[] args) {6 ThrowableAssertAlternative throwableAssertAlternative = assertThat(new IOException("test exception"));7 throwableAssertAlternative.withCauseExactlyInstanceOf(IOException.class);8 }9}10 at org.junit.Assert.assertEquals(Assert.java:115)11 at org.junit.Assert.assertEquals(Assert.java:144)12 at org.assertj.core.api.ThrowableAssertAlternative.withCauseExactlyInstanceOf(ThrowableAssertAlternative.java:170)13 at AssertJThrowableAssertAlternativeTest.main(AssertJThrowableAssertAlternativeTest.java:13)

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withCauseExactlyInstanceOf

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1import org.junit.jupiter.api.Test;2import static org.assertj.core.api.Assertions.assertThat;3import static org.assertj.core.api.Assertions.assertThatThrownBy;4public class ThrowableAssertAlternativeCauseExactlyInstanceOfTest {5 public void testCauseExactlyInstanceOf() {6 Exception exception = new Exception("exception message");7 exception.initCause(new RuntimeException("runtime exception message"));8 assertThatThrownBy(() -> {9 throw exception;10 })11 .hasCauseExactlyInstanceOf(RuntimeException.class)12 .hasMessage("exception message")13 .hasNoSuppressedExceptions();14 }15}16 at ThrowableAssertAlternativeCauseExactlyInstanceOfTest.testCauseExactlyInstanceOf(ThrowableAssertAlternat

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withCauseExactlyInstanceOf

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1import org.junit.Test;2import static org.assertj.core.api.Assertions.assertThat;3public class AssertJExceptionCauseTest {4 public void test() {5 try {6 throw new RuntimeException("Test Exception", new IllegalArgumentException("Cause Exception"));7 } catch (Throwable t) {8 assertThat(t).withCauseExactlyInstanceOf(IllegalArgumentException.class).withMessage("Cause Exception");9 }10 }11}12at org.junit.Assert.assertEquals(Assert.java:115)13at org.junit.Assert.assertEquals(Assert.java:144)14at org.assertj.core.api.ThrowableAssertAlternative.withCauseExactlyInstanceOf(ThrowableAssertAlternative.java:96)15at com.baeldung.assertj.exception.AssertJExceptionCauseTest.test(AssertJExceptionCauseTest.java:14)16import org.junit.Test;17import static org.assertj.core.api.Assertions.assertThat;18public class AssertJExceptionCauseTest {19 public void test() {20 try {21 throw new RuntimeException("Test Exception", new IllegalArgumentException("Cause Exception"));22 } catch (Throwable t) {23 assertThat(t).withCauseExactlyInstanceOf(IllegalArgumentException.class).withMessage("Cause Exception");24 }25 }26}27at org.junit.Assert.assertEquals(Assert.java:115)28at org.junit.Assert.assertEquals(Assert.java:144)29at org.assertj.core.api.ThrowableAssertAlternative.withCauseExactlyInstanceOf(ThrowableAssertAlternative.java:96)

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