Supertrait for typeclasses that enable be empty matcher syntax.
An Emptiness[T] provides access to the "emptiness" of type T in such
a way that be empty matcher syntax can be used with type T. A T
can be any type that in some way can be empty. ScalaTest provides implicit implementations for several types.
You can enable the be empty matcher syntax on your own type U by defining an Emptiness[U]
for the type and making it available implicitly.
ScalaTest provides implicit Emptiness instances for scala.collection.GenTraversable,
java.util.Collection, java.util.Map, String, Array,
and scala.Option in the Emptiness companion object.
- Companion:
- object
class Object
trait Matchable
class Any