org.scalatest

FailureOf

trait FailureOf extends AnyRef

Trait that contains the failureOf method, which captures an exception thrown by a passed code block and returns it wrapped in a Some, or returns None if no exception is thrown.

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  1. final def !=(arg0: AnyRef): Boolean

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  10. def failureOf(f: ⇒ Unit): Option[Throwable]

    Executes the supplied code (a by-name parameter) and returns in an optional throwable indicating whether the passed expression failed (threw an exception that would normally cause a test to fail) or succeeded (did not throw any exception).

    Executes the supplied code (a by-name parameter) and returns in an optional throwable indicating whether the passed expression failed (threw an exception that would normally cause a test to fail) or succeeded (did not throw any exception).

    Because Errors are used to denote serious errors, trait Suite and its subtypes in the ScalaTest API do not always treat a test that completes abruptly with an Error as a test failure, but sometimes as an indication that serious problems have arisen that should cause the run to abort. For example, if a test completes abruptly with an OutOfMemoryError, it will not be reported as a test failure, but will instead cause the run to abort. Because not everyone uses Errors only to represent serious problems, however, ScalaTest only behaves this way for the following exception types (and their subclasses):

    • java.lang.annotation.AnnotationFormatError
    • java.awt.AWTError
    • java.nio.charset.CoderMalfunctionError
    • javax.xml.parsers.FactoryConfigurationError
    • java.lang.LinkageError
    • java.lang.ThreadDeath
    • javax.xml.transform.TransformerFactoryConfigurationError
    • java.lang.VirtualMachineError

    The previous list includes all Errors that exist as part of Java 1.5 API, excluding java.lang.AssertionError. ScalaTest does treat a thrown AssertionError as an indication of a test failure. In addition, any other Error that is not an instance of a type mentioned in the previous list will be caught by the Suite traits in the ScalaTest API and reported as the cause of a test failure.

    If the code supplied to failureOf completes abruptly in one of the errors in the previous list, failureOf will not return it wrapped in an option, but rather will complete abruptly with the same exception. The failureOf method will wrap any other exception thrown by the supplied code in a Some and return it.

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