trait
OptionValues
extends AnyRef
Type Members
-
class
Valuable
[T]
extends AnyRef
Value Members
-
def
!=
(arg0: AnyRef): Boolean
-
def
!=
(arg0: Any): Boolean
-
def
##
(): Int
-
def
==
(arg0: AnyRef): Boolean
-
def
==
(arg0: Any): Boolean
-
def
asInstanceOf
[T0]
: T0
-
def
clone
(): AnyRef
-
implicit def
convertOptionToValuable
[T]
(opt: Option[T]): Valuable[T]
-
def
eq
(arg0: AnyRef): Boolean
-
def
equals
(arg0: Any): Boolean
-
def
finalize
(): Unit
-
def
getClass
(): java.lang.Class[_]
-
def
hashCode
(): Int
-
def
isInstanceOf
[T0]
: Boolean
-
def
ne
(arg0: AnyRef): Boolean
-
def
notify
(): Unit
-
def
notifyAll
(): Unit
-
def
synchronized
[T0]
(arg0: ⇒ T0): T0
-
def
toString
(): String
-
def
wait
(): Unit
-
def
wait
(arg0: Long, arg1: Int): Unit
-
def
wait
(arg0: Long): Unit
Inherited from AnyRef
Inherited from Any
Trait that provides an implicit conversion that adds a
value
method toOption
, which will return the value of the option if it is defined, or throwTestFailedException
if not.This construct allows you to express in one statement that an option should be defined and that its value should meet some expectation. Here's an example:
opt.value should be > 9
Or, using an assertion instead of a matcher expression:
assert(opt.value > 9)
Were you to simply invoke
get
on theOption
, if the option wasn't defined, it would throw aNoSuchElementException
:The
NoSuchElementException
would cause the test to fail, but without providing a stack depth pointing to the failing line of test code. This stack depth, provided byTestFailedException
(and a few other ScalaTest exceptions), makes it quicker for users to navigate to the cause of the failure. WithoutOptionValues
, to get a stack depth exception you would need to make two statements, like this:The
OptionValues
trait allows you to state that more concisely: