org.scalatest.prop.Configuration

MaxDiscarded

case class MaxDiscarded (value: Int) extends PropertyCheckConfigParam with Product with Serializable

A PropertyCheckConfigParam that specifies the maximum number of discarded property evaluations allowed during property evaluation.

In GeneratorDrivenPropertyChecks, a property evaluation is discarded if it throws UnmetConditionException, which is produce by whenever clause that evaluates to false. For example, consider this ScalaTest property check:

// forAll defined in GeneratorDrivenPropertyChecks
forAll { (n: Int) =>
  whenever (n > 0) {
    doubleIt(n) should equal (n * 2)
  }
}

In the above code, whenever a non-positive n is passed, the property function will complete abruptly with UnmetConditionException.

Similarly, in Checkers, a property evaluation is discarded if the expression to the left of ScalaCheck's ==> operator is false. Here's an example:

// forAll defined in Checkers
forAll { (n: Int) =>
  (n > 0) ==> doubleIt(n) == (n * 2)
}

For either kind of property check, MaxDiscarded indicates the maximum number of discarded evaluations that will be allowed. As soon as one past this number of evaluations indicates it needs to be discarded, the property check will fail.

Linear Supertypes
Serializable, Serializable, Product, Equals, PropertyCheckConfigParam, AnyRef, Any
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  1. MaxDiscarded
  2. Serializable
  3. Serializable
  4. Product
  5. Equals
  6. PropertyCheckConfigParam
  7. AnyRef
  8. Any
Visibility
  1. Public
  2. All

Instance Constructors

  1. new MaxDiscarded (value: Int)

Value Members

  1. def != (arg0: AnyRef): Boolean

    Attributes
    final
    Definition Classes
    AnyRef

  2. def != (arg0: Any): Boolean

    Attributes
    final
    Definition Classes
    Any

  3. def ## (): Int

    Attributes
    final
    Definition Classes
    AnyRef → Any

  4. def == (arg0: AnyRef): Boolean

    Attributes
    final
    Definition Classes
    AnyRef

  5. def == (arg0: Any): Boolean

    Attributes
    final
    Definition Classes
    Any

  6. def asInstanceOf [T0] : T0

    Attributes
    final
    Definition Classes
    Any

  7. def canEqual (arg0: Any): Boolean

    Definition Classes
    MaxDiscarded → Equals

  8. def clone (): AnyRef

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()

  9. def eq (arg0: AnyRef): Boolean

    Attributes
    final
    Definition Classes
    AnyRef

  10. def equals (arg0: Any): Boolean

    Definition Classes
    MaxDiscarded → Equals → AnyRef → Any

  11. def finalize (): Unit

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws()

  12. def getClass (): java.lang.Class[_]

    Attributes
    final
    Definition Classes
    AnyRef

  13. def hashCode (): Int

    Definition Classes
    MaxDiscarded → AnyRef → Any

  14. def isInstanceOf [T0] : Boolean

    Attributes
    final
    Definition Classes
    Any

  15. def ne (arg0: AnyRef): Boolean

    Attributes
    final
    Definition Classes
    AnyRef

  16. def notify (): Unit

    Attributes
    final
    Definition Classes
    AnyRef

  17. def notifyAll (): Unit

    Attributes
    final
    Definition Classes
    AnyRef

  18. def productArity : Int

    Definition Classes
    MaxDiscarded → Product

  19. def productElement (arg0: Int): Any

    Definition Classes
    MaxDiscarded → Product

  20. def productIterator : Iterator[Any]

    Definition Classes
    Product

  21. def productPrefix : String

    Definition Classes
    MaxDiscarded → Product

  22. def synchronized [T0] (arg0: ⇒ T0): T0

    Attributes
    final
    Definition Classes
    AnyRef

  23. def toString (): String

    Definition Classes
    MaxDiscarded → AnyRef → Any

  24. val value : Int

  25. def wait (): Unit

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()

  26. def wait (arg0: Long, arg1: Int): Unit

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()

  27. def wait (arg0: Long): Unit

    Attributes
    final
    Definition Classes
    AnyRef
    Annotations
    @throws()

  28. def productElements : Iterator[Any]

    Definition Classes
    Product
    Annotations
    @deprecated
    Deprecated

    use productIterator instead

Inherited from Serializable

Inherited from Serializable

Inherited from Product

Inherited from Equals

Inherited from PropertyCheckConfigParam

Inherited from AnyRef

Inherited from Any