org.scalatest

TryValues

trait TryValues extends AnyRef

Trait that provides an implicit conversion that adds success and failure methods to scala.util.Try, enabling you to make assertions about the value of a Success or the exception of a Failure.

The success method will return the Try on which it is invoked as a Success if the Try actually is a Success, or throw TestFailedException if not. The failure method will return the Try on which it is invoked as a Failure if the Try actually is a Failure, or throw TestFailedException if not.

This construct allows you to express in one statement that an Try should be either a Success or a Failure and that its value or exception, respectively,should meet some expectation. Here's an example:

try1.success.value should be > 9
try2.failure.exception should have message "/ by zero"

Or, using assertions instead of a matchers:

assert(try1.success.value > 9)
assert(try2.failure.exception.getMessage == "/ by zero")

Were you to simply invoke get on the Try, if the Try wasn't a Success, it would throw the exception contained in the Failure:

val try2 = Try { 1 / 0 }

try2.get should be < 9 // try2.get throws ArithmeticException

The ArithmeticException would cause the test to fail, but without providing a stack depth pointing to the failing line of test code. This stack depth, provided by TestFailedException (and a few other ScalaTest exceptions), makes it quicker for users to navigate to the cause of the failure. Without TryValues, to get a stack depth exception you would need to make two statements, like this:

try2 should be a 'success // throws TestFailedException
try2.get should be < 9

The TryValues trait allows you to state that more concisely:

try2.success.value should be < 9 // throws TestFailedException

Source
TryValues.scala
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TryValues
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Type Members

  1. class SuccessOrFailure[T] extends AnyRef

    Wrapper class that adds success and failure methods to scala.util.Try, allowing you to make statements like:

Value Members

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

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  2. final def !=(arg0: Any): Boolean

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  3. final def ##(): Int

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  4. final def ==(arg0: AnyRef): Boolean

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  5. final def ==(arg0: Any): Boolean

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  6. final def asInstanceOf[T0]: T0

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  7. def clone(): AnyRef

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  8. implicit def convertTryToSuccessOrFailure[T](theTry: Try[T]): SuccessOrFailure[T]

    Implicit conversion that adds success and failure methods to Try.

    Implicit conversion that adds success and failure methods to Try.

    theTry

    the Try to which to add the success and failure methods

  9. final def eq(arg0: AnyRef): Boolean

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  10. def equals(arg0: Any): Boolean

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  11. def finalize(): Unit

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  12. final def getClass(): Class[_]

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  14. final def isInstanceOf[T0]: Boolean

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  15. final def ne(arg0: AnyRef): Boolean

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  16. final def notify(): Unit

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  17. final def notifyAll(): Unit

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  18. final def synchronized[T0](arg0: ⇒ T0): T0

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  19. def toString(): String

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  20. final def wait(): Unit

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  21. final def wait(arg0: Long, arg1: Int): Unit

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  22. final def wait(arg0: Long): Unit

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