Gen

A wrapper type for range types

Provides implicit org.scalacheck.Gen.Choose instances

Generator parameters, used by org.scalacheck.Gen.apply

Provides methods for creating org.scalacheck.Gen.Parameters values

A generator that picks at least one element from a list

A generator that picks at least one element from a list

Generates Int values according to the given binomial distribution, specified by the number of trials to conduct, and the probability of a true test.

This distribution counts the number of trials which were successful according to a given test probability.

The range of values is [0, trials].

Generates a container of any Traversable type for which there exists an implicit org.scalacheck.util.Buildable instance. The elements in the container will be generated by the given generator. The size of the container is bounded by the size parameter used when generating values.

Generates a container of any Traversable type for which there exists an implicit org.scalacheck.util.Buildable instance. The elements in the container will be generated by the given generator. The size of the generated container is limited by n. Depending on what kind of container that is generated, the resulting container may contain fewer elements than n, but not more. If the given generator fails generating a value, the complete container generator will also fail.

A generator that generates a random value in the given (inclusive) range. If the range is invalid, an IllegalBoundsError exception will be thrown.

Generates numbers within the given inclusive range, with extra weight on zero, +/- unity, both extremities, and any special numbers provided. The special numbers must lie within the given range, otherwise they won't be included.

A convenience method for calling buildableOf[C[T],T](g).

A convenience method for calling buildableOfN[C[T],T](n,g).

Wraps a generator for later evaluation. The given parameter is evaluated each time the wrapper generator is evaluated.

Generates a Left of T or a Right of U with equal probability.

Generates Double values according to the given exponential distribution, specified by its rate parameter.

The mean and standard deviation are both equal to 1/rate.

The range of values is [0, ∞).

A generator that never generates a value

Chooses one of the given generators with a weighted random distribution

Creates a Function0 generator.

Generates Double values according to the given gaussian distribution, specified by its mean and standard deviation.

Gaussian distributions are also called normal distributions.

The range of values is theoretically (-∞, ∞) but 99.7% of all values will be contained within (mean ± 3 * stdDev).

Generates Int values according to the given geometric distribution, specified by its mean.

This distribution represents the expected number of failures before a successful test, where the probability of a successful test is p = 1 / (mean + 1).

The ideal range of values is [0, ∞), although the largest value that can be produced here is 2147483647 (Int.MaxValue).

Generates an infinite stream.

Failures in the underlying generator may terminate the stream. Otherwise it will continue forever.

Generates a list of random length. The maximum length depends on the size parameter. This method is equal to calling containerOf[List,T](g).

Generates a list with at most the given number of elements. This method is equal to calling containerOfN[List,T](n,g).

Wraps a generator lazily. The given parameter is only evaluated once, and not until the wrapper generator is evaluated.

Generates a map of random length. The maximum length depends on the size parameter. This method is equal to calling containerOfMap,(T,U).

Generates a map with at most the given number of elements. This method is equal to calling containerOfNMap,(T,U).

Generates negative numbers of uniform distribution, with an lower bound of the negated generation size parameter.

Generates a non-empty container of any Traversable type for which there exists an implicit org.scalacheck.util.Buildable instance. The elements in the container will be generated by the given generator. The size of the container is bounded by the size parameter used when generating values.

A convenience method for calling nonEmptyBuildableOf[C[T],T](g).

Generates a non-empty list of random length. The maximum length depends on the size parameter. This method is equal to calling nonEmptyContainerOf[List,T](g).

Generates a non-empty map of random length. The maximum length depends on the size parameter. This method is equal to calling nonEmptyContainerOfMap,(T,U).

Picks a random value from a list.

Picks a random value from a list.

Picks a random value from a list

Picks a random generator from a list

Makes a generator result optional. Either Some(T) or None will be provided.

Creates a generator that can access its generation parameters

A generator that randomly picks a given number of elements from a list

The elements are not guaranteed to be permuted in random order.

A generator that randomly picks a given number of elements from a list

The elements are not guaranteed to be permuted in random order.

Generates Int values according to the given Poisson distribution, specified by its rate parameters.

The mean equals the rate; the standard deviation is sqrt(rate).

In principle any positive value is a valid rate parameter. However, our method of generating values cannot handle large rates, so we require rate <= 745.

Generates positive numbers of uniform distribution, with an upper bound of the generation size parameter.

Generates a Boolean which has the given chance to be true.

• prob(1.0) is always true
• prob(0.5) is true 50% of the time
• prob(0.1) is true 10% of the time
• prob(0.0) is never true

A fixed point generator. This is useful for making recursive structures e.g.

Gen.recursive[List[Int]] { recurse => Gen.choose(0, 10).flatMap { idx => if (idx < 5) recurse.map(idx :: _) else Gen.const(idx :: Nil) } }

Creates a resized version of a generator

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Sequences generators. If any of the given generators fails, the resulting generator will also fail.

Creates a generator that can access its generation size

A generator that returns Some(T)

A generator that picks a random number of elements from a list

A generator that picks a random number of elements from a list

Monadic recursion on Gen This is a stack-safe loop that is the same as:

fn(a).flatMap {
 case Left(a) => tailRec(a)(fn)
 case Right(b) => Gen.const(b)
 }

which is useful for doing monadic loops without blowing up the stack

Gen creator for Function1

Gen creator for Function10

Gen creator for Function11

Gen creator for Function12

Gen creator for Function13

Gen creator for Function14

Gen creator for Function15

Gen creator for Function16

Gen creator for Function17

Gen creator for Function18

Gen creator for Function19

Gen creator for Function2

Gen creator for Function20

Gen creator for Function21

Gen creator for Function22

Gen creator for Function3

Gen creator for Function4

Gen creator for Function5

Gen creator for Function6

Gen creator for Function7

Gen creator for Function8

Gen creator for Function9

Generates an infinite lazy list.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Takes a function and returns a generator that generates arbitrary results of that function by feeding it with arbitrarily generated input parameters.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Combines the given generators into one generator that produces a tuple of their generated values.

Generates an alpha character

Generates a lower-case alpha character

Generates a string of lower-case alpha characters

Generates an alphanumerical character

Generates a string of alphanumerical characters

Generates a string of alpha characters

Generates an upper-case alpha character

Generates a string of upper-case alpha characters

Generates a ASCII character, with extra weighting for printable characters

Generates a ASCII printable character

Generates a string of ASCII printable characters

Generates a string of ASCII characters, with extra weighting for printable characters

Generate a Double uniformly-distributed in [0, 1).

This method will generate one of 2^53 distinct Double values in the unit interval.

Generates instance of Duration.

In addition to FiniteDuration values, this can generate Duration.Inf, Duration.MinusInf, and Duration.Undefined.

Generates a character that can represent a valid hexadecimal digit. This includes both upper and lower case values.

Generates a string that can represent a valid hexadecimal digit. This includes both upper and lower case values.

Generates a string that starts with a lower-case alpha character, and only contains alphanumerical characters

Generate a uniformly-distributed Long.

This method has an equally likely method of generating every possible Long value.

Generates a numerical character

Generates a string of digits

A generator that returns the current generation size

Generates a version 4 (random) UUID.

A generator that always generates the given value

Implicit convenience method for using the frequency method like this:

 frequency((1, "foo"), (3, "bar"))