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trait Collecting[E, C] extends AnyRef

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.

Source
Collecting.scala
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Abstract Value Members

  1. abstract def genTraversableFrom(collection: C): GenTraversable[E]

    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 .

    collection

    a collection to check the size of

    returns

    a GenTraversable[E] containing the same elements as the passed collection

  2. abstract def loneElementOf(collection: C): Option[E]

    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.

    collection

    a collection about which an assertion is being made

    returns

    Some[E] if the collection contains one and only one element, None otherwise.

  3. abstract def sizeOf(collection: C): Int

    Returns the size of the passed collection.

    Returns the size of the passed collection.

    collection

    a collection to check the size of

    returns

    the size of the passed collection

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