org.scalatest.prop

GeneratorDrivenPropertyChecks

trait GeneratorDrivenPropertyChecks extends Whenever with Configuration

Trait containing methods that faciliate property checks against generated data using ScalaCheck.

This trait contains forAll methods that provide various ways to check properties using generated data. Use of this trait requires that ScalaCheck be on the class path when you compile and run your tests. It also contains a wherever method that can be used to indicate a property need only hold whenever some condition is true.

For an example of trait GeneratorDrivenPropertyChecks in action, imagine you want to test this Fraction class:

class Fraction(n: Int, d: Int) {
  require(d != 0)
  require(d != Integer.MIN_VALUE)
  require(n != Integer.MIN_VALUE)
  val numer = if (d < 0) -1 * n else n
  val denom = d.abs
  override def toString = numer + " / " + denom
}

To test the behavior of Fraction, you could mix in or import the members of GeneratorDrivenPropertyChecks(and ShouldMatchers) and check a property using a forAll method, like this:

forAll { (n: Int, d: Int) =>
  whenever (d != 0 && d != Integer.MIN_VALUE
      && n != Integer.MIN_VALUE) {
    val f = new Fraction(n, d)
    if (n < 0 && d < 0 || n > 0 && d > 0)
      f.numer should be > 0
    else if (n != 0)
      f.numer should be < 0
    else
      f.numer should be === 0
    f.denom should be > 0
  }
}

Trait GeneratorDrivenPropertyChecks provides overloaded forAll methods that allow you to check properties using the data provided by a ScalaCheck generator. The simplest form of forAll method takes two parameter lists, the second of which is implicit. The first parameter list is a "property" function with one to six parameters. An implicit Arbitrary generator and Shrink object needs to be supplied for The forAll method will pass each row of data to each parameter type. ScalaCheck provides many implicit Arbitrary generators for common types such asInt, String, List[Float], etc., in its org.scalacheck.Arbitrary companion object. So long as you use types for which ScalaCheck already provides implicit Arbitrary generators, you needn't worry about them. Same for Shrink objects, which are provided by ScalaCheck's org.scalacheck.Shrink companion object. Most often you can simply pass a property function to forAll, and the compiler will grab the implicit values provided by ScalaCheck.

The forAll methods use the supplied Arbitrary generators to generate example arguments and pass them to the property function, and generate a GeneratorDrivenPropertyCheckFailedException if the function completes abruptly for any exception that would normally cause a test to fail in ScalaTest other than DiscardedEvaluationException. AnDiscardedEvaluationException, which is thrown by the whenever method (defined in trait Whenever, which this trait extends) to indicate a condition required by the property function is not met by a row of passed data, will simply cause forAll to discard that row of data.

Supplying argument names

You can optionally specify string names for the arguments passed to a property function, which will be used in any error message when describing the argument values that caused the failure. To supply the names, place them in a comma separated list in parentheses after forAll before the property function (a curried form of forAll). Here's an example:

forAll ("a", "b") { (a: String, b: String) =>
  a.length + b.length should equal ((a + b).length + 1) // Should fail
}

When this fails, you'll see an error message that includes this:

Occurred when passed generated values (
  a = "",
  b = ""
)

When you don't supply argument names, the error message will say arg0, arg1, etc.. For example, this property check:

forAll { (a: String, b: String) =>
  a.length + b.length should equal ((a + b).length + 1) // Should fail
}

Will fail with an error message that includes:

Occurred when passed generated values (
  arg0 = "",
  arg1 = ""
)

Supplying generators

ScalaCheck provides a nice library of compositors that makes it easy to create your own custom generators. If you want to supply custom generators to a property check, place them in parentheses after forAll, before the property check function (a curried form of forAll).

For example, to create a generator of even integers between (and including) -2000 and 2000, you could write this:

import org.scalacheck.Gen
val evenInts = for (n <- Gen.choose(-1000, 1000)) yield 2 * n

Given this generator, you could use it on a property check like this:

forAll (evenInts) { (n) => n % 2 should equal (0) }

Custom generators are necessary when you want to pass data types not supported by ScalaCheck's arbitrary generators, but are also useful when some of the values in the full range for the passed types are not valid. For such values you would use a whenever clause. In the Fraction class shown above, neither the passed numerator or denominator can be Integer.MIN_VALUE, and the passed denominator cannot be zero. This shows up in thewhenever clause like this:

  whenever (d != 0 && d != Integer.MIN_VALUE
      && n != Integer.MIN_VALUE) { ...

You could in addition define generators for the numerator and denominator that only produce valid values, like this:

val validNumers =
  for (n <- Gen.choose(Integer.MIN_VALUE + 1, Integer.MAX_VALUE)) yield n
val validDenoms =
  for (d <- validNumers if d != 0) yield d

You could then use them in the property check like this:

forAll (validNumers, validDenoms) { (n: Int, d: Int) =>
  whenever (d != 0 && d != Integer.MIN_VALUE
      && n != Integer.MIN_VALUE) {
    val f = new Fraction(n, d)
    if (n < 0 && d < 0 || n > 0 && d > 0)
      f.numer should be > 0
    else if (n != 0)
      f.numer should be < 0
    else
      f.numer should be === 0
    f.denom should be > 0
  }
}

Note that even if you are use generators that don't produce the invalid values, you still need thewhenever clause. The reason is that once a property fails, ScalaCheck will try and shrink the values to the smallest values that still cause the property to fail. During this shrinking process ScalaCheck may pass invalid values. The whenever clause is still needed to guard against those values. (Thewhenever clause also clarifies to readers of the code exactly what the property is in a succinct way, without requiring that they find and understand the generator definitions.)

Supplying both generators and argument names

If you want to supply both generators and named arguments, you can do so by providing a list of (<generator>, <name>) pairs in parentheses after forAll, before the property function. Here's an example:

forAll ((validNumers, "n"), (validDenoms, "d")) { (n: Int, d: Int) =>
  whenever (d != 0 && d != Integer.MIN_VALUE
      && n != Integer.MIN_VALUE) {
    val f = new Fraction(n, d)
    if (n < 0 && d < 0 || n > 0 && d > 0)
      f.numer should be > 0
    else if (n != 0)
      f.numer should be < 0
    else
      f.numer should be === 0
    f.denom should be > 0
  }
}

Were this property check to fail, it would mention the names n and d in the error message, like this:

Occurred when passed generated values (
  n = 17,
  d = 21
)

Property check configuration

The property checks performed by the forAll methods of this trait can be flexibly configured via the services provided by supertrait Configuration. The five configuration parameters for property checks along with their default values and meanings are described in the following table:

Configuration ParameterDefault ValueMeaning
minSuccessful100the minimum number of successful property evaluations required for the property to pass
maxDiscarded500the maximum number of discarded property evaluations allowed during a property check
minSize0the minimum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists)
maxSize100the maximum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists)
workers1specifies the number of worker threads to use during property evaluation

The forAll methods of trait GeneratorDrivenPropertyChecks each take a PropertyCheckConfigobject as an implicit parameter. This object provides values for each of the five configuration parameters. Trait Configurationprovides an implicit val named generatorDrivenConfig with each configuration parameter set to its default value. If you want to set one or more configuration parameters to a different value for all property checks in a suite you can override this val (or hide it, for example, if you are importing the members of the GeneratorDrivenPropertyChecks companion object rather than mixing in the trait.) For example, if you want all parameters at their defaults except for minSize and maxSize, you can overridegeneratorDrivenConfig, like this:

implicit override val generatorDrivenConfig =
  PropertyCheckConfig(minSize = 10, maxSize = 20)

Or, if hide it by declaring a variable of the same name in whatever scope you want the changed values to be in effect:

implicit val generatorDrivenConfig =
  PropertyCheckConfig(minSize = 10, maxSize = 20)

In addition to taking a PropertyCheckConfig object as an implicit parameter, the forAll methods of traitGeneratorDrivenPropertyChecks also take a variable length argument list of PropertyCheckConfigParamobjects that you can use to override the values provided by the implicit PropertyCheckConfig for a single forAllinvocation. For example, if you want to set minSuccessful to 500 for just one particular forAll invocation, you can do so like this:

forAll (minSuccessful(500)) { (n: Int, d: Int) => ...

This invocation of forAll will use 500 for minSuccessful and whatever values are specified by the implicitly passed PropertyCheckConfig object for the other configuration parameters. If you want to set multiple configuration parameters in this way, just list them separated by commas:

forAll (minSuccessful(500), maxDiscarded(300)) { (n: Int, d: Int) => ...

If you are using an overloaded form of forAll that already takes an initial parameter list, just add the configuration parameters after the list of generators, names, or generator/name pairs, as in:

// If providing argument names
forAll ("n", "d", minSuccessful(500), maxDiscarded(300)) {
  (n: Int, d: Int) => ...
// If providing generators
forAll (validNumers, validDenoms, minSuccessful(500), maxDiscarded(300)) {
  (n: Int, d: Int) => ...
// If providing (&lt;generators&gt;, &lt;name&gt;) pairs
forAll ((validNumers, "n"), (validDenoms, "d"), minSuccessful(500), maxDiscarded(300)) {
  (n: Int, d: Int) => ...

For more information, see the documentation for supertrait Configuration.

go to: companion
linear super types: Configuration, Whenever, AnyRef, Any
known subclasses: PropertyChecks, PropertyChecks, GeneratorDrivenPropertyChecks
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Type Members

  1. class ConfiguredPropertyCheck extends AnyRef

    Performs a configured property checks by applying property check functions passed to its apply methods to arguments supplied by implicitly passed generators, modifying the values in thePropertyGenConfig object passed implicitly to its apply methods with parameter values passed to its constructor.

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

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

  3. case class MaxSize (value: Int) extends PropertyCheckConfigParam with Product

    A PropertyCheckConfigParam that specifies the maximum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

  4. case class MinSize (value: Int) extends PropertyCheckConfigParam with Product

    A PropertyCheckConfigParam that specifies the minimum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

  5. case class MinSuccessful (value: Int) extends PropertyCheckConfigParam with Product

    A PropertyCheckConfigParam that specifies the minimum number of successful property evaluations required for the property to pass.

  6. case class PropertyCheckConfig (minSuccessful: Int, maxDiscarded: Int, minSize: Int, maxSize: Int, workers: Int) extends Product

    Configuration object for property checks.

  7. class PropertyCheckConfigParam extends AnyRef

    Abstract class defining a family of configuration parameters for property checks.

  8. case class Workers (value: Int) extends PropertyCheckConfigParam with Product

    A PropertyCheckConfigParam that specifies the number of worker threads to use when evaluating a property.

Value Members

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

    attributes: final
    definition classes: AnyRef

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

    o != arg0 is the same as !(o == (arg0)).

    o != arg0 is the same as !(o == (arg0)).

    arg0

    the object to compare against this object for dis-equality.

    returns

    false if the receiver object is equivalent to the argument; true otherwise.

    attributes: final
    definition classes: Any

  3. def ## () : Int

    attributes: final
    definition classes: AnyRef → Any

  4. def $asInstanceOf [T0] () : T0

    attributes: final
    definition classes: AnyRef

  5. def $isInstanceOf [T0] () : Boolean

    attributes: final
    definition classes: AnyRef

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

    o == arg0 is the same as if (o eq null) arg0 eq null else o.equals(arg0).

    o == arg0 is the same as if (o eq null) arg0 eq null else o.equals(arg0).

    arg0

    the object to compare against this object for equality.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    attributes: final
    definition classes: AnyRef

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

    o == arg0 is the same as o.equals(arg0).

    o == arg0 is the same as o.equals(arg0).

    arg0

    the object to compare against this object for equality.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    attributes: final
    definition classes: Any

  8. def asInstanceOf [T0] : T0

    This method is used to cast the receiver object to be of type T0.

    This method is used to cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expressionList(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested typed.

    returns

    the receiver object.

    attributes: final
    definition classes: Any

  9. def clone () : AnyRef

    This method creates and returns a copy of the receiver object.

    This method creates and returns a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

    attributes: protected
    definition classes: AnyRef

  10. def eq (arg0: AnyRef) : Boolean

    This method is used to test whether the argument (arg0) is a reference to the receiver object (this).

    This method is used to test whether the argument (arg0) is a reference to the receiver object (this).

    The eq method implements an [http://en.wikipedia.org/wiki/Equivalence_relation equivalence relation] on non-null instances of AnyRef: * It is reflexive: for any non-null instance x of type AnyRef, x.eq(x) returns true. * It is symmetric: for any non-null instances x and y of type AnyRef, x.eq(y) returns true if and only if y.eq(x) returns true. * It is transitive: for any non-null instances x, y, and z of type AnyRef if x.eq(y) returns true and y.eq(z) returns true, then x.eq(z) returns true.

    Additionally, the eq method has three other properties. * It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false. * For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false. * null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    arg0

    the object to compare against this object for reference equality.

    returns

    true if the argument is a reference to the receiver object; false otherwise.

    attributes: final
    definition classes: AnyRef

  11. def equals (arg0: Any) : Boolean

    This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence.

    This method is used to compare the receiver object (this) with the argument object (arg0) for equivalence.

    The default implementations of this method is an [http://en.wikipedia.org/wiki/Equivalence_relation equivalence relation]: * It is reflexive: for any instance x of type Any, x.equals(x) should return true. * It is symmetric: for any instances x and y of type Any, x.equals(y) should return true if and only if y.equals(x) returns true. * It is transitive: for any instances x, y, and z of type AnyRef if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.

    If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is often necessary to override hashCode to ensure that objects that are "equal" (o1.equals(o2) returns true) hash to the same scala.Int (o1.hashCode.equals(o2.hashCode)).

    arg0

    the object to compare against this object for equality.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    definition classes: AnyRef → Any

  12. def finalize () : Unit

    This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.

    This method is called by the garbage collector on the receiver object when garbage collection determines that there are no more references to the object.

    The details of when and if the finalize method are invoked, as well as the interaction between finalizeand non-local returns and exceptions, are all platform dependent.

    attributes: protected
    definition classes: AnyRef

  13. def forAll [A, B, C, D, E, F] (genAndNameA: (Gen[A], String), genAndNameB: (Gen[B], String), genAndNameC: (Gen[C], String), genAndNameD: (Gen[D], String), genAndNameE: (Gen[E], String), genAndNameF: (Gen[F], String), configParams: PropertyCheckConfigParam*)(fun: (A, B, C, D, E, F) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B], shrC: Shrink[C], shrD: Shrink[D], shrE: Shrink[E], shrF: Shrink[F]) : Unit

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll ((famousLastWords, "a"), (famousLastWords, "b"), (famousLastWords, "c"), (famousLastWords, "d"), (famousLastWords, "e"), (famousLastWords, "f")) { (a: String, b: String, c: String, d: String, e: String, f: String) =>
  a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

    fun

    the property check function to apply to the generated arguments

  14. def forAll [A, B, C, D, E, F] (genA: Gen[A], genB: Gen[B], genC: Gen[C], genD: Gen[D], genE: Gen[E], genF: Gen[F], configParams: PropertyCheckConfigParam*)(fun: (A, B, C, D, E, F) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B], shrC: Shrink[C], shrD: Shrink[D], shrE: Shrink[E], shrF: Shrink[F]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll (famousLastWords, famousLastWords, famousLastWords, famousLastWords, famousLastWords, famousLastWords) { (a: String, b: String, c: String, d: String, e: String, f: String) =>
  a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

    fun

    the property check function to apply to the generated arguments

  15. def forAll [A, B, C, D, E, F] (nameA: String, nameB: String, nameC: String, nameD: String, nameE: String, nameF: String, configParams: PropertyCheckConfigParam*)(fun: (A, B, C, D, E, F) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B], arbC: Arbitrary[C], shrC: Shrink[C], arbD: Arbitrary[D], shrD: Shrink[D], arbE: Arbitrary[E], shrE: Shrink[E], arbF: Arbitrary[F], shrF: Shrink[F]) : Unit

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll ("a", "b", "c", "d", "e", "f") { (a: String, b: String, c: String, d: String, e: String, f: String) =>
  a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

    fun

    the property check function to apply to the generated arguments

  16. def forAll [A, B, C, D, E, F] (fun: (A, B, C, D, E, F) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B], arbC: Arbitrary[C], shrC: Shrink[C], arbD: Arbitrary[D], shrD: Shrink[D], arbE: Arbitrary[E], shrE: Shrink[E], arbF: Arbitrary[F], shrF: Shrink[F]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll { (a: String, b: String, c: String, d: String, e: String, f: String) =>
  a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

    fun

    the property check function to apply to the generated arguments

  17. def forAll [A, B, C, D, E] (genAndNameA: (Gen[A], String), genAndNameB: (Gen[B], String), genAndNameC: (Gen[C], String), genAndNameD: (Gen[D], String), genAndNameE: (Gen[E], String), configParams: PropertyCheckConfigParam*)(fun: (A, B, C, D, E) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B], shrC: Shrink[C], shrD: Shrink[D], shrE: Shrink[E]) : Unit

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll ((famousLastWords, "a"), (famousLastWords, "b"), (famousLastWords, "c"), (famousLastWords, "d"), (famousLastWords, "e")) { (a: String, b: String, c: String, d: String, e: String) =>
  a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

    fun

    the property check function to apply to the generated arguments

  18. def forAll [A, B, C, D, E] (genA: Gen[A], genB: Gen[B], genC: Gen[C], genD: Gen[D], genE: Gen[E], configParams: PropertyCheckConfigParam*)(fun: (A, B, C, D, E) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B], shrC: Shrink[C], shrD: Shrink[D], shrE: Shrink[E]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll (famousLastWords, famousLastWords, famousLastWords, famousLastWords, famousLastWords) { (a: String, b: String, c: String, d: String, e: String) =>
  a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

    fun

    the property check function to apply to the generated arguments

  19. def forAll [A, B, C, D, E] (nameA: String, nameB: String, nameC: String, nameD: String, nameE: String, configParams: PropertyCheckConfigParam*)(fun: (A, B, C, D, E) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B], arbC: Arbitrary[C], shrC: Shrink[C], arbD: Arbitrary[D], shrD: Shrink[D], arbE: Arbitrary[E], shrE: Shrink[E]) : Unit

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll ("a", "b", "c", "d", "e") { (a: String, b: String, c: String, d: String, e: String) =>
  a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

    fun

    the property check function to apply to the generated arguments

  20. def forAll [A, B, C, D, E] (fun: (A, B, C, D, E) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B], arbC: Arbitrary[C], shrC: Shrink[C], arbD: Arbitrary[D], shrD: Shrink[D], arbE: Arbitrary[E], shrE: Shrink[E]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll { (a: String, b: String, c: String, d: String, e: String) =>
  a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

    fun

    the property check function to apply to the generated arguments

  21. def forAll [A, B, C, D] (genAndNameA: (Gen[A], String), genAndNameB: (Gen[B], String), genAndNameC: (Gen[C], String), genAndNameD: (Gen[D], String), configParams: PropertyCheckConfigParam*)(fun: (A, B, C, D) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B], shrC: Shrink[C], shrD: Shrink[D]) : Unit

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll ((famousLastWords, "a"), (famousLastWords, "b"), (famousLastWords, "c"), (famousLastWords, "d")) { (a: String, b: String, c: String, d: String) =>
  a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

    fun

    the property check function to apply to the generated arguments

  22. def forAll [A, B, C, D] (genA: Gen[A], genB: Gen[B], genC: Gen[C], genD: Gen[D], configParams: PropertyCheckConfigParam*)(fun: (A, B, C, D) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B], shrC: Shrink[C], shrD: Shrink[D]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll (famousLastWords, famousLastWords, famousLastWords, famousLastWords) { (a: String, b: String, c: String, d: String) =>
  a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

    fun

    the property check function to apply to the generated arguments

  23. def forAll [A, B, C, D] (nameA: String, nameB: String, nameC: String, nameD: String, configParams: PropertyCheckConfigParam*)(fun: (A, B, C, D) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B], arbC: Arbitrary[C], shrC: Shrink[C], arbD: Arbitrary[D], shrD: Shrink[D]) : Unit

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll ("a", "b", "c", "d") { (a: String, b: String, c: String, d: String) =>
  a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

    fun

    the property check function to apply to the generated arguments

  24. def forAll [A, B, C, D] (fun: (A, B, C, D) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B], arbC: Arbitrary[C], shrC: Shrink[C], arbD: Arbitrary[D], shrD: Shrink[D]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll { (a: String, b: String, c: String, d: String) =>
  a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

    fun

    the property check function to apply to the generated arguments

  25. def forAll [A, B, C] (genAndNameA: (Gen[A], String), genAndNameB: (Gen[B], String), genAndNameC: (Gen[C], String), configParams: PropertyCheckConfigParam*)(fun: (A, B, C) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B], shrC: Shrink[C]) : Unit

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll ((famousLastWords, "a"), (famousLastWords, "b"), (famousLastWords, "c")) { (a: String, b: String, c: String) =>
  a.length + b.length + c.length should equal ((a + b + c).length)
}

    fun

    the property check function to apply to the generated arguments

  26. def forAll [A, B, C] (genA: Gen[A], genB: Gen[B], genC: Gen[C], configParams: PropertyCheckConfigParam*)(fun: (A, B, C) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B], shrC: Shrink[C]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll (famousLastWords, famousLastWords, famousLastWords) { (a: String, b: String, c: String) =>
  a.length + b.length + c.length should equal ((a + b + c).length)
}

    fun

    the property check function to apply to the generated arguments

  27. def forAll [A, B, C] (nameA: String, nameB: String, nameC: String, configParams: PropertyCheckConfigParam*)(fun: (A, B, C) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B], arbC: Arbitrary[C], shrC: Shrink[C]) : Unit

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll ("a", "b", "c") { (a: String, b: String, c: String) =>
  a.length + b.length + c.length should equal ((a + b + c).length)
}

    fun

    the property check function to apply to the generated arguments

  28. def forAll [A, B, C] (fun: (A, B, C) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B], arbC: Arbitrary[C], shrC: Shrink[C]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll { (a: String, b: String, c: String) =>
  a.length + b.length + c.length should equal ((a + b + c).length)
}

    fun

    the property check function to apply to the generated arguments

  29. def forAll [A, B] (genAndNameA: (Gen[A], String), genAndNameB: (Gen[B], String), configParams: PropertyCheckConfigParam*)(fun: (A, B) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B]) : Unit

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll ((famousLastWords, "a"), (famousLastWords, "b")) { (a: String, b: String) =>
  a.length + b.length should equal ((a + b).length)
}

    fun

    the property check function to apply to the generated arguments

  30. def forAll [A, B] (genA: Gen[A], genB: Gen[B], configParams: PropertyCheckConfigParam*)(fun: (A, B) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A], shrB: Shrink[B]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll (famousLastWords, famousLastWords) { (a: String, b: String) =>
  a.length + b.length should equal ((a + b).length)
}

    fun

    the property check function to apply to the generated arguments

  31. def forAll [A, B] (nameA: String, nameB: String, configParams: PropertyCheckConfigParam*)(fun: (A, B) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B]) : Unit

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll ("a", "b") { (a: String, b: String) =>
  a.length + b.length should equal ((a + b).length)
}

    fun

    the property check function to apply to the generated arguments

  32. def forAll [A, B] (fun: (A, B) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A], arbB: Arbitrary[B], shrB: Shrink[B]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll { (a: String, b: String) =>
  a.length + b.length should equal ((a + b).length)
}

    fun

    the property check function to apply to the generated arguments

  33. def forAll [A] (genAndNameA: (Gen[A], String), configParams: PropertyCheckConfigParam*)(fun: (A) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A]) : Unit

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll ((famousLastWords, "a")) { (a: String) =>
  a.length should equal ((a).length)
}

    fun

    the property check function to apply to the generated arguments

  34. def forAll [A] (genA: Gen[A], configParams: PropertyCheckConfigParam*)(fun: (A) ⇒ Unit)(implicit config: PropertyCheckConfig, shrA: Shrink[A]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

    Here's an example:

    import org.scalacheck.Gen
    // Define your own string generator:
val famousLastWords = for {
  s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s
    forAll (famousLastWords) { (a: String) =>
  a.length should equal ((a).length)
}

    fun

    the property check function to apply to the generated arguments

  35. def forAll [A] (nameA: String, configParams: PropertyCheckConfigParam*)(fun: (A) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A]) : Unit

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll ("a") { (a: String) =>
  a.length should equal ((a).length)
}

    fun

    the property check function to apply to the generated arguments

  36. def forAll [A] (fun: (A) ⇒ Unit)(implicit config: PropertyCheckConfig, arbA: Arbitrary[A], shrA: Shrink[A]) : Unit

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

    Here's an example:

    forAll { (a: String) =>
  a.length should equal ((a).length)
}

    fun

    the property check function to apply to the generated arguments

  37. def forAll (configParams: PropertyCheckConfigParam*) : ConfiguredPropertyCheck

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators, modifying the values in the implicitly passedPropertyGenConfig object with explicitly passed parameter values.

    Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators, modifying the values in the implicitly passedPropertyGenConfig object with explicitly passed parameter values.

    This method creates a ConfiguredPropertyCheck object that has six overloaded apply methods that take a function. Thus it is used with functions of all six arities. Here are some examples:

    forAll (minSize(1), maxSize(10)) { (a: String) =>
  a.length should equal ((a).length)
}
    forAll (minSize(1), maxSize(10)) { (a: String, b: String) =>
  a.length + b.length should equal ((a + b).length)
}
    forAll (minSize(1), maxSize(10)) { (a: String, b: String, c: String) =>
  a.length + b.length + c.length should equal ((a + b + c).length)
}
    forAll (minSize(1), maxSize(10)) { (a: String, b: String, c: String, d: String) =>
  a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}
    forAll (minSize(1), maxSize(10)) { (a: String, b: String, c: String, d: String, e: String) =>
  a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}
    forAll (minSize(1), maxSize(10)) { (a: String, b: String, c: String, d: String, e: String, f: String) =>
  a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

    configParams

    a variable length list of PropertyCheckConfigParam objects that should override corresponding values in the PropertyCheckConfig implicitly passed to the apply methods of the ConfiguredPropertyCheck object returned by this method.

  38. implicit val generatorDrivenConfig : PropertyCheckConfig

    Implicit PropertyCheckConfig value providing default configuration values.

    Implicit PropertyCheckConfig value providing default configuration values.

    attributes: implicit
    definition classes: Configuration

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

    Returns a representation that corresponds to the dynamic class of the receiver object.

    Returns a representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

    a representation that corresponds to the dynamic class of the receiver object.

    attributes: final
    definition classes: AnyRef

  40. def hashCode () : Int

    Returns a hash code value for the object.

    Returns a hash code value for the object.

    The default hashing algorithm is platform dependent.

    Note that it is allowed for two objects to have identical hash codes (o1.hashCode.equals(o2.hashCode)) yet not be equal (o1.equals(o2) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the equals method.

    returns

    the hash code value for the object.

    definition classes: AnyRef → Any

  41. def isInstanceOf [T0] : Boolean

    This method is used to test whether the dynamic type of the receiver object is T0.

    This method is used to test whether the dynamic type of the receiver object is T0.

    Note that the test result of the test is modulo Scala's erasure semantics. Therefore the expression1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested typed.

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    attributes: final
    definition classes: Any

  42. def maxDiscarded (value: Int) : MaxDiscarded

    Returns a MaxDiscarded property check configuration parameter containing the passed value, which specifies the maximum number of discarded property evaluations allowed during property evaluation.

    Returns a MaxDiscarded property check configuration parameter containing the passed value, which specifies the maximum number of discarded property evaluations allowed during property evaluation.

    definition classes: Configuration

  43. def maxSize (value: Int) : MaxSize

    Returns a MaxSize property check configuration parameter containing the passed value, which specifies the maximum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

    Returns a MaxSize property check configuration parameter containing the passed value, which specifies the maximum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

    Note that the maximum size should be greater than or equal to the minimum size. This requirement is enforced by the PropertyCheckConfig constructor and the forAll methods of traits PropertyChecks and Checkers. In other words, it is enforced at the point both a maximum and minimum size are provided together.

    definition classes: Configuration

  44. def minSize (value: Int) : MinSize

    Returns a MinSize property check configuration parameter containing the passed value, which specifies the minimum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

    Returns a MinSize property check configuration parameter containing the passed value, which specifies the minimum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

    definition classes: Configuration

  45. def minSuccessful (value: Int) : MinSuccessful

    Returns a MinSuccessful property check configuration parameter containing the passed value, which specifies the minimum number of successful property evaluations required for the property to pass.

    Returns a MinSuccessful property check configuration parameter containing the passed value, which specifies the minimum number of successful property evaluations required for the property to pass.

    definition classes: Configuration

  46. def ne (arg0: AnyRef) : Boolean

    o.ne(arg0) is the same as !(o.eq(arg0)).

    o.ne(arg0) is the same as !(o.eq(arg0)).

    arg0

    the object to compare against this object for reference dis-equality.

    returns

    false if the argument is not a reference to the receiver object; true otherwise.

    attributes: final
    definition classes: AnyRef

  47. def notify () : Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    attributes: final
    definition classes: AnyRef

  48. def notifyAll () : Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    attributes: final
    definition classes: AnyRef

  49. def synchronized [T0] (arg0: T0) : T0

    attributes: final
    definition classes: AnyRef

  50. def toString () : String

    Returns a string representation of the object.

    Returns a string representation of the object.

    The default representation is platform dependent.

    returns

    a string representation of the object.

    definition classes: AnyRef → Any

  51. def wait () : Unit

    attributes: final
    definition classes: AnyRef

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

    attributes: final
    definition classes: AnyRef

  53. def wait (arg0: Long) : Unit

    attributes: final
    definition classes: AnyRef

  54. def whenever (condition: Boolean)(fun: ⇒ Unit) : Unit

    Evaluates the passed code block if the passed boolean condition is true, else throws DiscardedEvaluationException.

    Evaluates the passed code block if the passed boolean condition is true, else throws DiscardedEvaluationException.

    The whenever method can be used inside property check functions to discard invocations of the function with data for which it is known the property would fail. For example, given the following Fraction class:

    class Fraction(n: Int, d: Int) {
      require(d != 0)
  require(d != Integer.MIN_VALUE)
  require(n != Integer.MIN_VALUE)
      val numer = if (d < 0) -1 * n else n
  val denom = d.abs
      override def toString = numer + " / " + denom
}

    import org.scalatest.prop.TableDrivenPropertyChecks._
    val fractions =
  Table(
    ("n", "d"),
    (  1,   2),
    ( -1,   2),
    (  1,  -2),
    ( -1,  -2),
    (  3,   1),
    ( -3,   1),
    ( -3,   0),
    (  3,  -1),
    (  3,  Integer.MIN_VALUE),
    (Integer.MIN_VALUE, 3),
    ( -3,  -1)
  )

    Imagine you wanted to check a property against this class with data that includes some value that are rejected by the constructor, such as a denominator of zero, which should result in an IllegalArgumentException. You could use wheneverto discard any rows in the fraction that represent illegal arguments, like this:

    import org.scalatest.matchers.ShouldMatchers._
    forAll (fractions) { (n: Int, d: Int) =>
      whenever (d != 0 && d != Integer.MIN_VALUE
      && n != Integer.MIN_VALUE) {
        val f = new Fraction(n, d)
        if (n < 0 && d < 0 || n > 0 && d > 0)
      f.numer should be > 0
    else if (n != 0)
      f.numer should be < 0
    else
      f.numer should be === 0
        f.denom should be > 0
  }
}

    In this example, rows 6, 8, and 9 have values that would cause a false to be passed to whenever. (For example, in row 6, d is 0, which means d != 0will be false.) For those rows, whenever will throw DiscardedEvaluationException, which will cause the forAll method to discard that row.

    condition

    the boolean condition that determines whether whenever will evaluate the fun function (condition is true) or throws DiscardedEvaluationException (condition is false)

    fun

    the function to evaluate if the specified condition is true

    definition classes: Whenever

  55. def workers (value: Int) : Workers

    Returns a Workers property check configuration parameter containing the passed value, which specifies the number of worker threads to use when evaluating a property.

    Returns a Workers property check configuration parameter containing the passed value, which specifies the number of worker threads to use when evaluating a property.

    definition classes: Configuration

Inherited from Configuration

Inherited from Whenever

Inherited from AnyRef

Inherited from Any