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

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

Source:ThrowableAssert_hasRootCause_Test.java

...15import org.assertj.core.api.ThrowableAssertBaseTest;16import org.assertj.core.util.AssertionsUtil;17import org.junit.jupiter.api.Test;18public class ThrowableAssert_hasRootCause_Test extends ThrowableAssertBaseTest {19    private Throwable npe = new NullPointerException();20    @Test21    public void should_fail_if_actual_and_expected_root_cause_have_different_types() {22        // GIVEN23        Throwable rootCause = new IllegalStateException();24        Throwable cause = new RuntimeException(rootCause);25        final Throwable throwable = new IllegalArgumentException(cause);26        // WHEN27        AssertionError actual = AssertionsUtil.expectAssertionError(() -> assertThat(throwable).hasRootCause(new NullPointerException()));28        // THEN29        Assertions.assertThat(actual).hasMessage(String.format(("%n" + ((("Expecting a root cause with type:%n" + "  <\"java.lang.NullPointerException\">%n") + "but type was:%n") + "  <\"java.lang.IllegalStateException\">."))));30    }31}...

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