Wrapper class that adds a value
method to LeftProjection
, allowing
you to make statements like:
Wrapper class that adds a value
method to RightProjection
, allowing
you to make statements like:
Implicit conversion that adds a value
method to LeftProjection
.
Implicit conversion that adds a value
method to LeftProjection
.
Implicit conversion that adds a value
method to RightProjection
.
Implicit conversion that adds a value
method to RightProjection
.
Trait that provides an implicit conversion that adds
left.value
andright.value
methods toEither
, which will return the selected value of theEither
if defined, or throwTestFailedException
if not.This construct allows you to express in one statement that an
Either
should be left or right and that its value should meet some expectation. Here's are some examples:Or, using assertions instead of matcher expressions:
Were you to simply invoke
right.get
orleft.get
on theEither
, if theEither
wasn't defined as expected (e.g., it was aLeft
when you expected aRight
), 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. WithoutEitherValues
, to get a stack depth exception you would need to make two statements, like this:The
EitherValues
trait allows you to state that more concisely: