How to use NullPointerException method of org.assertj.core.api.throwable.ThrowableAssert_rootCause_Test class

Best Assertj code snippet using org.assertj.core.api.throwable.ThrowableAssert_rootCause_Test.NullPointerException

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...19import org.assertj.core.api.NavigationMethodBaseTest;20import org.assertj.core.api.ThrowableAssert;21import org.junit.jupiter.api.Test;22class ThrowableAssert_rootCause_Test implements NavigationMethodBaseTest<ThrowableAssert<Throwable>> {23 private final Throwable rootCause = new NullPointerException();24 private final Throwable cause = new RuntimeException(rootCause);25 @Test26 void should_return_throwable_assertions_for_actual_root_cause() {27 /​/​ GIVEN28 Throwable throwable = new Throwable(cause);29 /​/​ WHEN/​THEN30 assertThat(throwable).rootCause()31 .isNotSameAs(cause)32 .isSameAs(rootCause);33 }34 @Test35 void should_fail_if_actual_has_no_root_cause() {36 /​/​ GIVEN37 Throwable actual = new Throwable();...

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NullPointerException

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1import org.assertj.core.api.Assertions;2import org.junit.Test;3public class ThrowableAssert_rootCause_Test {4 public void test() {5 NullPointerException exception = new NullPointerException("null");6 Assertions.assertThat(exception).hasRootCauseInstanceOf(NullPointerException.class);7 }8}9org.assertj.core.api.throwable.ThrowableAssert_rootCause_Test > test() PASSED

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