ConstantArbitrary

Rasuvaeff\PropertyTesting\Arbitrary\ConstantArbitrary

Class — Package: property-testing-core — Source — Version: v1.0.0-1-g88fdee2

Implements: Enumerable, ArbitraryInterface

Type parameters:

• TValue of mixed = mixed

Always produces the same fixed value. Useful as a building block for composite generators (e.g. a record field that is held constant) and for pinning one parameter while others vary.

There is nothing smaller than a constant, so it does not shrink.

Constructor

__construct(
    \Arbitrary\TValue $value,
)

Parameter	Type	Default	Description
$value	Arbitrary\TValue	required

Methods

generate()

generate(Random $random): Shrinkable

Produce one random value from this arbitrary's space, together with its shrink tree. Candidates must be ordered most aggressive first (typically toward a zero/empty/identity element) and every branch of the tree must be finite, so shrinking terminates.

Documentation inherited from ArbitraryInterface.

domainSize()

domainSize(): int

How many distinct values enumerate() walks, or null when the domain is not finite in this configuration. Saturates at PHP_INT_MAX rather than overflowing — a budget compares against it, nothing computes with it. An upper bound is acceptable where the exact count is not known without walking (a filter over a finite source).

Documentation inherited from Enumerable.

enumerate()

enumerate(): iterable

Every value of the domain, once each, as a shrinkable node with the same tree generate() would give it, in a fixed order that does not depend on any seed. Only meaningful when domainSize() is not null; an implementation may throw otherwise.

Documentation inherited from Enumerable.