Trait/Object

org.scalatest

TryValues

Related Docs: object TryValues | package scalatest

Permalink

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
Linear Supertypes
AnyRef, Any
Known Subclasses
Ordering
  1. Alphabetic
  2. By inheritance
Inherited
  1. TryValues
  2. AnyRef
  3. Any
  1. Hide All
  2. Show all
Visibility
  1. Public
  2. All

Type Members

  1. class SuccessOrFailure[T] extends AnyRef

    Permalink

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

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

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

Value Members

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

    Permalink
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

    Permalink
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

    Permalink
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0

    Permalink
    Definition Classes
    Any
  5. def clone(): AnyRef

    Permalink
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  6. implicit def convertTryToSuccessOrFailure[T](theTry: Try[T]): SuccessOrFailure[T]

    Permalink

    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

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

    Permalink
    Definition Classes
    AnyRef
  8. def equals(arg0: Any): Boolean

    Permalink
    Definition Classes
    AnyRef → Any
  9. def finalize(): Unit

    Permalink
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]

    Permalink
    Definition Classes
    AnyRef → Any
  11. def hashCode(): Int

    Permalink
    Definition Classes
    AnyRef → Any
  12. final def isInstanceOf[T0]: Boolean

    Permalink
    Definition Classes
    Any
  13. final def ne(arg0: AnyRef): Boolean

    Permalink
    Definition Classes
    AnyRef
  14. final def notify(): Unit

    Permalink
    Definition Classes
    AnyRef
  15. final def notifyAll(): Unit

    Permalink
    Definition Classes
    AnyRef
  16. final def synchronized[T0](arg0: ⇒ T0): T0

    Permalink
    Definition Classes
    AnyRef
  17. def toString(): String

    Permalink
    Definition Classes
    AnyRef → Any
  18. final def wait(): Unit

    Permalink
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  19. final def wait(arg0: Long, arg1: Int): Unit

    Permalink
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  20. final def wait(arg0: Long): Unit

    Permalink
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Inherited from AnyRef

Inherited from Any

Ungrouped