Wrapper class that adds a value
method to LeftProjection
, allowing
you to make statements like:
Wrapper class that adds a value
method to LeftProjection
, allowing
you to make statements like:
either.left.value should be > 9
Wrapper class that adds a value
method to RightProjection
, allowing
you to make statements like:
Wrapper class that adds a value
method to RightProjection
, allowing
you to make statements like:
either.right.value should be > 9
Wrapper class that adds a value
method to Either
, allowing
you to make statements to inspect the value if a Right, like:
Wrapper class that adds a value
method to Either
, allowing
you to make statements to inspect the value if a Right, like:
either.value should be > 9
Implicit conversion that adds a value
method to Either
.
Implicit conversion that adds a value
method to Either
.
This method is right biased and is the equivalent of calling either.right.value
.
the Either
on which to add the value
method
Implicit conversion that adds a value
method to LeftProjection
.
Implicit conversion that adds a value
method to LeftProjection
.
the LeftProjection
on which to add the value
method
Implicit conversion that adds a value
method to RightProjection
.
Implicit conversion that adds a value
method to RightProjection
.
the RightProjection
on which to add the value
method
The .right.value syntax on Either has been deprecated and will be removed in a future version of ScalaTest. Please use .value instead.
Trait that provides an implicit conversion that adds
value
(when you expect a Right) andleft.value
(when you expect a Left) 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
left.get
on theEither
, if theEither
wasn't defined as expected (e.g., it was aRight
when you expected aLeft
), 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: