scalatestCoreDotty/org.scalatest/LoneElement/LoneElementCollectionWrapper

LoneElementCollectionWrapper

org.scalatest.LoneElement.LoneElementCollectionWrapper

final class LoneElementCollectionWrapper[E, CTC[_]](collection: CTC[E], collecting: Collecting[E, CTC[E]], prettifier: Prettifier, pos: Position)

Wrapper class that adds a loneElement method to any collection type C for which an implicit Collecting[C] is available.

Through the implicit conversion provided by trait LoneElement, this class allows you to make statements like:

trav.loneElement should be > 9

Type parameters

CTC: the "collection type constructor" for the collection on which to add the loneElement method
E: the element type of the collection on which to add the loneElement method

Value parameters

collecting: a typeclass that enables the loneElement syntax
collection: a collection to wrap in a LoneElementCollectionWrapper, which provides the loneElement method.

Attributes

Graph
Supertypes: class Object

trait Matchable

class Any

Members list

Value members

Concrete methods

Returns the value contained in the wrapped collection, if it contains one and only one element, else throws TestFailedException with a detail message describing the problem.

This method enables syntax such as the following:

trav.loneElement should be > 9
    ^

Attributes

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