Supertrait for typeclasses that enable loneElement and inspectors syntax
for collections.
A Collecting[E, C] provides access to the "collecting nature" of type C in such
a way that loneElement syntax can be used with type C. A C
can be any type of "collecting", a type that in some way collects or brings together elements of type E.
ScalaTest provides implicit implementations for several types. You can enable the contain matcher syntax
on your own type U by defining an Collecting[E, U] for the type and making it available implicitly.
ScalaTest provides implicit Collecting instances for scala.collection.GenTraversable,
Array, java.util.Collection and java.util.Map in the
Collecting companion object.
- Companion:
- object
Value members
Abstract methods
Returns a GenTraversable[E] containing the same elements (in the same
order, if the original collection had a defined order), as the passed collection .
Returns a GenTraversable[E] containing the same elements (in the same
order, if the original collection had a defined order), as the passed collection .
- Value parameters:
- collection
a
collectionto check the size of
- Returns:
a
GenTraversable[E]containing the same elements as the passedcollection
Implements the loneElement syntax of trait LoneElement.
Implements the loneElement syntax of trait LoneElement.
Returns the lone element contained in a collection, wrapped in a Some, or None
if the collection contains either no elements or more than one element.
- Value parameters:
- collection
a collection about which an assertion is being made
- Returns:
Some[E]if the collection contains one and only one element,Noneotherwise.